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(Capeweed (Arctotheca calendula
Arctotheca calendula
Common name:
Capeweed, Daisy chains,
Palatability to Livestock:
Variable.
Toxicity to Goats:
Low risk toxicity.
Toxicity to Other Species:
Potentially toxic to sheep, cattle, pigs and
horses.
Poisonous Principle:
Nitrates.
Effects:
Signs and symptoms;
Respiratory distress, gasping, rapid .
breathing,
.Tremors, staggering, and collapse .
.The gums may darken .
.Scouring and enteritis in pigs .
Health and Production Problems;
Affected animals may be just found dead, or .
die very quickly. Some may recover.
.Hairballs from seeds and buds can kill sheep .
.Can cause hay-fever in humans .
This plant may contribute to “Australian .
Stringhalt” in horses.
.May cause off-flavours in milk .
Comments:
An annual or biennial, flat, rosette weed, a .
stemless plant with a large taproot.
Leaves are serrated and deeply lobed, with a .
white mat of hair on the lower surface.
,Flowers are single and yellow on long stalks .
with brown marks at the base of the petals,
fading as they age, flowering in the spring.
The plant establishes in autumn, with the .
main growth during winter and spring.
.It can withstand frost and drought .
Goats may eat this plant at all stages, from .
before flowering, through to the dried off
stage.
The woolly seeds and flower buds may cause .
hairballs in sheep.
The plant may cause a taint in meat and milk .
products.
A native of South Africa, found in all .
Australian states, particularly in temperate
regions.
Treatment;
.See Vet, treat as for nitrate poisoning .
Integrated Control Strategy:
.Try goats .
Selective broadleaf herbicides, (Group C or .
I), Glyphosate®, Trifluralin® or Oryzalin®.
Soil compaction from machinery may .
encourage growth of this weed.
Often grows in magnesium deficient soils, so .
dolomite may help.
.Declared “Noxious” in Tasmania
Common name:
Capeweed, Daisy chains,
Palatability to Livestock:
Variable.
Toxicity to Goats:
Low risk toxicity.
Toxicity to Other Species:
Potentially toxic to sheep, cattle, pigs and
horses.
Poisonous Principle:
Nitrates.
Effects:
Signs and symptoms;
Respiratory distress, gasping, rapid .
breathing,
.Tremors, staggering, and collapse .
.The gums may darken .
.Scouring and enteritis in pigs .
Health and Production Problems;
Affected animals may be just found dead, or .
die very quickly. Some may recover.
.Hairballs from seeds and buds can kill sheep .
.Can cause hay-fever in humans .
This plant may contribute to “Australian .
Stringhalt” in horses.
.May cause off-flavours in milk .
Comments:
An annual or biennial, flat, rosette weed, a .
stemless plant with a large taproot.
Leaves are serrated and deeply lobed, with a .
white mat of hair on the lower surface.
,Flowers are single and yellow on long stalks .
with brown marks at the base of the petals,
fading as they age, flowering in the spring.
The plant establishes in autumn, with the .
main growth during winter and spring.
.It can withstand frost and drought .
Goats may eat this plant at all stages, from .
before flowering, through to the dried off
stage.
The woolly seeds and flower buds may cause .
hairballs in sheep.
The plant may cause a taint in meat and milk .
products.
A native of South Africa, found in all .
Australian states, particularly in temperate
regions.
Treatment;
.See Vet, treat as for nitrate poisoning .
Integrated Control Strategy:
.Try goats .
Selective broadleaf herbicides, (Group C or .
I), Glyphosate®, Trifluralin® or Oryzalin®.
Soil compaction from machinery may .
encourage growth of this weed.
Often grows in magnesium deficient soils, so .
dolomite may help.
.Declared “Noxious” in Tasmania
سلام به همگي
استاد ممنون از پاسخ درست وتوضيحات كاملتون
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استاد ممنون از پاسخ درست وتوضيحات كاملتون
زحمت سوال بعد با شما
Capeweed
Arctotheca calendula
Scientific Name
Arctotheca calendula (L.) Levyns
Synonyms
Arctotis calendula L.
Cryptostemma calendulaceum (L.) R. Br.
Common Names
Cape daisy, Cape dandelion, Cape marigold, Cape weed, Capeweed, marigold, plain treasure flower, silverspreader, South African Capeweed
Family
Asteraceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)
Compositae (South Australia)
Origin
Native to southern Africa (i.e. Lesotho and Cape Province and Natal in South Africa).
Naturalised Distribution
Widely naturalised throughout the southern, central and eastern regions of Australia. It is widespread and common in New South Wales, the ACT, Victoria, Tasmania, South Australia and the southern and western parts of Western Australia. Less common or scattered in Queensland and the southern parts of the Northern Territory.
Also naturalised on Norfolk Island and in many other parts of the world, including Europe, the Azores, New Zealand and south-western USA (i.e. California).
Cultivation
This species was widely grown as a garden ornamental in the past.
Habitat
A weed of rangelands, pastures, crops, orchards, gardens, lawns, sports fields, footpaths, roadsides, waste areas, bare ground, disturbed sites and natural areas (e.g. coastal environs, grasslands and open woodlands) in the temperate, semi-arid and sub-tropicalregions of Australia. It is occasionally also found growing in arid and tropical regions.
Distinguishing Features
Arctotheca calendula
Scientific Name
Arctotheca calendula (L.) Levyns
Synonyms
Arctotis calendula L.
Cryptostemma calendulaceum (L.) R. Br.
Common Names
Cape daisy, Cape dandelion, Cape marigold, Cape weed, Capeweed, marigold, plain treasure flower, silverspreader, South African Capeweed
Family
Asteraceae (Queensland, New South Wales, the ACT, Victoria, Tasmania, Western Australia and the Northern Territory)
Compositae (South Australia)
Origin
Native to southern Africa (i.e. Lesotho and Cape Province and Natal in South Africa).
Naturalised Distribution
Widely naturalised throughout the southern, central and eastern regions of Australia. It is widespread and common in New South Wales, the ACT, Victoria, Tasmania, South Australia and the southern and western parts of Western Australia. Less common or scattered in Queensland and the southern parts of the Northern Territory.
Also naturalised on Norfolk Island and in many other parts of the world, including Europe, the Azores, New Zealand and south-western USA (i.e. California).
Cultivation
This species was widely grown as a garden ornamental in the past.
Habitat
A weed of rangelands, pastures, crops, orchards, gardens, lawns, sports fields, footpaths, roadsides, waste areas, bare ground, disturbed sites and natural areas (e.g. coastal environs, grasslands and open woodlands) in the temperate, semi-arid and sub-tropicalregions of Australia. It is occasionally also found growing in arid and tropical regions.
Distinguishing Features
[*=left]a low-growing short-lived plant with semi-upright flowering stems up to 30 cm tall.
[*=left]its leaves (5-25 cm long and 2-6 cm wide) are somewhat elongated in shape with toothed to deeply lobed margins.
[*=left]these leaves have hairless or slightly hairy upper surfaces and whitish, felty undersides.
[*=left]its flower-heads (2-6 cm across) have dark-purplish coloured centres and numerous yellow 'petals' (1-2.5 cm long).
[*=left]its 'seeds' (2-2.5 mm long) and densely covered in a brownish or pinkish coloured fluffy wool.
Habit
A low-growing short-lived (i.e. annual) herbaceous plant with semi-upright (i.e. decumbent to ascending) flowering stems reaching up to 30 cm tall. Prior to flowering it is either stemless and forming a basal rosette, or has short creeping or sprawling stems.
Seedling
Its two seed leaves (i.e. cotyledons) are hairless (i.e. glabrous) and narrowly club-shaped with rounded tips (i.e. narrowly-clavate). The first true leaves are spear-shaped (i.e. lanceolate) with lobed or bluntly toothed margins and whitish hairy undersides.
Stems and Leaves
Its flowering stems are loosely covered in white woolly hairs (i.e. they are loosely tomentose).
Its simple leaves are mostly basal and somewhat elongated in shape with toothed to deeply lobed margins (i.e. they are oblanceolate tolyrate-pinnatisect). These leaves (5-25 cm long and 2-6 cm wide) have hairless or slightly hairy (i.e. glabrous to mealy-pubescent) upper surfaces that are green in colour and whitish, densely felty-hairy undersides.
Flowers and Fruit
The flowering stems (i.e. peduncles) are 5-25 cm long and bear a single flower-head (i.e. solitary capitulum). These flower-heads (2-6 cm across) have a hemispherical base (about 15 mm across) that is surrounded by several rows of bracts (i.e. involucral bracts). The greenish-coloured bracts are slightly elongated in shape (i.e. broadly-lanceolate), the outer ones with hairy tips (i.e. ciliate apices) and the inner ones with membranous (i.e. scarious) margins. Each flower-head also has numerous tiny dark-purplish coloured tubular flowers (i.e. tubular or disc florets) in the centre that are surrounded by several large 'petals' (i.e. ray florets). The 'petals' (1-2.5 cm long) are pale yellow with brighter yellow bases and greenish or purplish coloured undersides. Flowering occurs mainly during late winter and spring (i.e. from August to November).
The dark brown 'seeds' (i.e. achenes or cypselas) are oblong in shape (2-2.5 mm long) and densely covered in a brownish or pinkish coloured fluffy wool. The top of the seed has a ring (i.e. pappus) of 6-8 tiny scales.
Reproduction and Dispersal
This species reproduces only by seed. The seeds are commonly dispersed short distances by wind and can also become attached to birds, animals, shoes and clothing. They are also spread to new areas in contaminated soil, dumped garden waste, by vehicles and machinery, and in contaminated agricultural produce (i.e. fodder).
Impacts
Capeweed (Arctotheca calendula) is regarded as an environmental weed in Victoria, New South Wales, Western Australia, South Australia, the ACT and the Northern Territory. Though it is widely known as a very common weed of habitation (i.e. gardens and lawns) and agricultural areas (i.e. crops and pastures) in temperate Australia, it is also increasingly becoming a problem in natural areas (particularly in coastal environs and in semi-arid and arid regions).
In Western Australia populations of Capeweed (Arctotheca calendula) are increasing rapidly in the arid zone, and they are displacingephemeral native species in these areas. It is also a significant problem in the rangelands of southern Australia, where it replaces more palatable native species, especially in areas that are overgrazed. Capeweed (Arctotheca calendula) is also present in numerous conservation areas (e.g. Swallow Lagoon Nature Conservation Reserve and Kinglake National Park in Victoria, Hale Conservation Park and Coffin Bay National Park in South Australia, Weddin Mountains National Park and Tumblong State Conservation Area in New South Wales, Fitzgerald River National Park in Western Australia and Tasman National Park in Tasmania) and it often poses a threat to the integrity of plant communities and the survival of threatened species in these sites.
For example, weed competition from this and other weed species is seen as one of the main threats to the vulnerable red darling pea (Swainsona plagiotropis) in the upper Murray River valley in southern New South Wales. It is also present in areas where the remaining known populations of Irwin's conostylis (Conostylis dielsii subsp. teres) are located east of Dongara in the Geraldton region in Western Australia (and is of particular concern to populations located in road reserves where weeds are more abundant). The mountain villarsia (Villarsia calthifolia), which is limited to the Porongurup Range in south-western Western Australia, is also under threat from several weedspecies, including Capeweed (Arctotheca calendula).
Capeweed (Arctotheca calendula) is also a common coastal weed in the Gulf St. Vincent area near Adelaide in south-eastern South Australia. It forms mats of vegetation in heavy soils in reardunes and also harbours pests that are a threat to native seedlings (e.g. red spider mite). It has also been reported as a weed of coastal sites in other parts of Australia (e.g. at Greens Beach Reserve in Tasmania and in coastal foreshores at Joondalup in Western Australia).
Other Impacts
Capeweed (Arctotheca calendula) is a troublesome weed in pastures, crops and home gardens. In newly sown pastures it can smothergrass and clover seedlings, and in drier regions it can often dominate overgrazed pastures. Though it is of some use as a fodder, it dies off during summer leaving bare areas that are vulnerable to erosion and invasion by other weeds. It can also taint milk and high nitrate levels in plants have caused livestock deaths (e.g. sheep and cattle). It is also a major weed of crops in southern Australia and a common pest of lawns, sporting fields, golf courses and home gardens.
Similar Species
Capeweed (Arctotheca calendula) is very similar to the gazanias (Gazania linearis and Gazania rigens ) and similar to beach daisy (Arctotheca populifolia ) and white arctotis (Arctotis stoechadifolia ). These species can be distinguished by the following differences:
A low-growing short-lived (i.e. annual) herbaceous plant with semi-upright (i.e. decumbent to ascending) flowering stems reaching up to 30 cm tall. Prior to flowering it is either stemless and forming a basal rosette, or has short creeping or sprawling stems.
Seedling
Its two seed leaves (i.e. cotyledons) are hairless (i.e. glabrous) and narrowly club-shaped with rounded tips (i.e. narrowly-clavate). The first true leaves are spear-shaped (i.e. lanceolate) with lobed or bluntly toothed margins and whitish hairy undersides.
Stems and Leaves
Its flowering stems are loosely covered in white woolly hairs (i.e. they are loosely tomentose).
Its simple leaves are mostly basal and somewhat elongated in shape with toothed to deeply lobed margins (i.e. they are oblanceolate tolyrate-pinnatisect). These leaves (5-25 cm long and 2-6 cm wide) have hairless or slightly hairy (i.e. glabrous to mealy-pubescent) upper surfaces that are green in colour and whitish, densely felty-hairy undersides.
Flowers and Fruit
The flowering stems (i.e. peduncles) are 5-25 cm long and bear a single flower-head (i.e. solitary capitulum). These flower-heads (2-6 cm across) have a hemispherical base (about 15 mm across) that is surrounded by several rows of bracts (i.e. involucral bracts). The greenish-coloured bracts are slightly elongated in shape (i.e. broadly-lanceolate), the outer ones with hairy tips (i.e. ciliate apices) and the inner ones with membranous (i.e. scarious) margins. Each flower-head also has numerous tiny dark-purplish coloured tubular flowers (i.e. tubular or disc florets) in the centre that are surrounded by several large 'petals' (i.e. ray florets). The 'petals' (1-2.5 cm long) are pale yellow with brighter yellow bases and greenish or purplish coloured undersides. Flowering occurs mainly during late winter and spring (i.e. from August to November).
The dark brown 'seeds' (i.e. achenes or cypselas) are oblong in shape (2-2.5 mm long) and densely covered in a brownish or pinkish coloured fluffy wool. The top of the seed has a ring (i.e. pappus) of 6-8 tiny scales.
Reproduction and Dispersal
This species reproduces only by seed. The seeds are commonly dispersed short distances by wind and can also become attached to birds, animals, shoes and clothing. They are also spread to new areas in contaminated soil, dumped garden waste, by vehicles and machinery, and in contaminated agricultural produce (i.e. fodder).
Impacts
Capeweed (Arctotheca calendula) is regarded as an environmental weed in Victoria, New South Wales, Western Australia, South Australia, the ACT and the Northern Territory. Though it is widely known as a very common weed of habitation (i.e. gardens and lawns) and agricultural areas (i.e. crops and pastures) in temperate Australia, it is also increasingly becoming a problem in natural areas (particularly in coastal environs and in semi-arid and arid regions).
In Western Australia populations of Capeweed (Arctotheca calendula) are increasing rapidly in the arid zone, and they are displacingephemeral native species in these areas. It is also a significant problem in the rangelands of southern Australia, where it replaces more palatable native species, especially in areas that are overgrazed. Capeweed (Arctotheca calendula) is also present in numerous conservation areas (e.g. Swallow Lagoon Nature Conservation Reserve and Kinglake National Park in Victoria, Hale Conservation Park and Coffin Bay National Park in South Australia, Weddin Mountains National Park and Tumblong State Conservation Area in New South Wales, Fitzgerald River National Park in Western Australia and Tasman National Park in Tasmania) and it often poses a threat to the integrity of plant communities and the survival of threatened species in these sites.
For example, weed competition from this and other weed species is seen as one of the main threats to the vulnerable red darling pea (Swainsona plagiotropis) in the upper Murray River valley in southern New South Wales. It is also present in areas where the remaining known populations of Irwin's conostylis (Conostylis dielsii subsp. teres) are located east of Dongara in the Geraldton region in Western Australia (and is of particular concern to populations located in road reserves where weeds are more abundant). The mountain villarsia (Villarsia calthifolia), which is limited to the Porongurup Range in south-western Western Australia, is also under threat from several weedspecies, including Capeweed (Arctotheca calendula).
Capeweed (Arctotheca calendula) is also a common coastal weed in the Gulf St. Vincent area near Adelaide in south-eastern South Australia. It forms mats of vegetation in heavy soils in reardunes and also harbours pests that are a threat to native seedlings (e.g. red spider mite). It has also been reported as a weed of coastal sites in other parts of Australia (e.g. at Greens Beach Reserve in Tasmania and in coastal foreshores at Joondalup in Western Australia).
Other Impacts
Capeweed (Arctotheca calendula) is a troublesome weed in pastures, crops and home gardens. In newly sown pastures it can smothergrass and clover seedlings, and in drier regions it can often dominate overgrazed pastures. Though it is of some use as a fodder, it dies off during summer leaving bare areas that are vulnerable to erosion and invasion by other weeds. It can also taint milk and high nitrate levels in plants have caused livestock deaths (e.g. sheep and cattle). It is also a major weed of crops in southern Australia and a common pest of lawns, sporting fields, golf courses and home gardens.
Similar Species
Capeweed (Arctotheca calendula) is very similar to the gazanias (Gazania linearis and Gazania rigens ) and similar to beach daisy (Arctotheca populifolia ) and white arctotis (Arctotis stoechadifolia ). These species can be distinguished by the following differences:
[*=left]Capeweed (Arctotheca calendula) has elongated deeply lobed (i.e. lyrate-pinnatisect) leaves with green upper surfaces and whitish hairy undersides. Its flower-heads are relatively large (2-6 cm across) with dark purplish or black centres and 'petals' (i.e. ray florets) 10-25 mm long. These 'petals' are yellow with darker yellow bases and greenish or purplish coloured undersides.
[*=left]the gazanias (Gazania linearis and Gazania rigens ) have elongated entire to deeply lobed (i.e. entire to pinnatisect) leaves with green or greyish upper surfaces and whitish hairy undersides. Its flower-heads are very large (6-12 cm across) with yellow or orange centres and 'petals' (i.e. ray florets) 30-50 mm long. These 'petals' are various colours and usually have darker bases.
[*=left]beach daisy (Arctotheca populifolia ) has oval (i.e. elliptic) leaves with entire margins greyish-green hairy surfaces. Its flower-heads are relatively small (2-3.5 cm across) with yellow or orange centres and 'petals' (i.e. ray florets) 5-7 mm long. These 'petals' are entirely yellow in colour.
[*=left]white arctotis (Arctotis stoechadifolia ) has elongated (i.e. lanceolate) leaves with the toothed (i.e. serrate) or deeply lobed (i.e. lyrate-pinnatisect) margins and greyish hairy surfaces. Its flower-heads are relatively large (4-6 cm across) with dark purplish or black centres and 'petals' (i.e. ray florets) 25-30 mm long. These 'petals' are creamy-white to light yellow with darker yellow bases (sometimes pink or purplish throughout) and maroon or mauve undersides.
Capeweed (Arctotheca calendula) is also very similar to creeping Capeweed (Arctotheca prostrata), which is only naturalised in Victoria. However, creeping Capeweed (Arctotheca prostrata) can be distinguished by its longer creeping stems and its flowers, which have yellow centres.
Legislation
Not declared or considered noxious by any state government authorities.
Management
For information on the management of this species see the following resources:
Legislation
Not declared or considered noxious by any state government authorities.
Management
For information on the management of this species see the following resources:
[*=left]the Tasmanian Department of Primary Industries and Water Weed Service Sheet on this species, which is available online athttp://www.dpiw.tas.gov.au.
large infestation (Photo: Sheldon Navie)
infestation (Photo: Sheldon Navie)
infestation growing in a lawn (Photo: Sheldon Navie)
habit (Photo: Sheldon Navie)
elongated leaves and young flower-heads (Photo: Sheldon Navie)
close-up of leaves showing deeply-lobed margins (Photo: Sheldon Navie)
close-up of hairy leaf underside (Photo: Sheldon Navie)
yellow flower-heads with darker centres (Photo: Sheldon Navie)
close-up of flower-heads (Photo: Sheldon Navie)
close-up of bracts at base of flower-head (Photo: Greg Jordan)
close-up of old flower-head with fluffy 'seeds' (Photo: Sheldon Navie)
seedling (Photo: Sheldon Navie)
با تشکر از دوستان، لطفا بفرمائید تصویر زیر کدام علف هرز را نشان می دهد؟؟؟
تصاویر دیگری از این علف هرز:
خیر، شمشاد که علف هرز نیست! برای راهنمایی میگم که از گیاهان آبزی و از علفهای هرز مزارع برنج است...از فک و فامیلای شمشاده ؟
بسیار عالی، آفرین، مثل همیشه خوب جواب دادید. بهش علف تمساح (ALLIGATOR WEED) هم میگن. لطفا توضیحات مختصری نیز بفرمائید و سوال بعد را مطرح کنید...
ممنون از لطفتون
| Alternanthera sessilis | |
|---|---|
| |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Caryophyllales |
| Family: | Amaranthaceae |
| Subfamily: | Gomphrenoideae |
| Genus: | Alternanthera |
| Species: | A. sessilis |
| Binomial name | |
| Alternanthera sessilis (L.) R.Br. ex DC. | |
| Synonyms | |
| Alternanthera glabra Gomphrena sessilis |
Alternanthera sessilis is an aquatic plant known by several common names, including sessile joyweedand dwarf copperleaf. It is used as an aquarium plant.The plant occurs around the world.The leaves are used as a vegetable.[SUP][1][/SUP] Young shoots and leaves are eaten as a vegetable in Southeast Asia. Occasionally it is cultivated for food or for use in herbal medicines.This species is classified as a weed in parts of the southern States of the USA. It is usually (but not always especially in areas of high humidity where it can even be a garden weed) found in wet or damp spots.This is a perennial herb with prostrate stems, rarely ascending, often rooting at the nodes. Leaves obovate to broadly elliptic, occasionally linear-lanceolate, 1-15 cm long, 0.3-3 cm wide, glabrous to sparsely villous, petioles 1-5 mm long. Flowers in sessile spikes, bract and bracteoles shiny white, 0.7-1.5 mm long, glabrous; sepals equal, 2.5-3 mm long, outer ones 1-nerved or indistinctly 3-nerved toward base; stamens 5, 2 sterile. In the wild it flowers from December till March.Aerva lanata is often mistaken for Alternanthera sessilis, which is also of the Amaranthecea family, and looks similar. On careful observation you will notice that flowers of Alternanthera sessilis are situated over the stem and their shape is round. As its flowers look like the eyes of a fish, Alternanthera sessilis is called Matsyakshi, fisheyed. Other Indian names of this plant are Koypa (Marathi), Honganne (Kannada). Leaves along with the flowers and tender stems are used as vegetable in Karnataka. It is diuretic, tonic and cooling. Juice of this plant, deemed beneficial to eyes, is an ingredient in the making of medicinal hair oils and Kajal (kohl). The red variety of this plant is a common garden hedging plant, which is also used as a culinary vegetable.
This plant is available in the aquarium trade though it will not grow submersed for anything but short periods. However it can be useful in the tropical pond or terrarium though needs restriction as it can grow and propagate quickly under good conditions.
| Alternanthera sessilis (L.) R. Br. ex DC. sessile joyweed | |||||||||||||||||||||||||||||||||||||||||
|
Synonyms:
Alternanthera sessilis (L.) R. Br. ex DC.
Alternanthera sessilis (L.) R. Br. ex DC.
| ACSE4 | Achyranthes sessilis (L.) Desf. ex Steud. | |
| ALGL11 | Alternanthera glabra Moq. | |
| GOSE2 | Gomphrena sessilis L.
Noxious Weed Information: Alternanthera sessilis (L.) R. Br. ex DC. This plant and the related entity italicized and indented below are listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete noxious weed list for that location, or click here for a composite list of all Federal and State Noxious Weeds. United States: sessile joyweed Noxious weed Alabama: sessile joyweed Class A noxious weed Arkansas: Alternanthera alligatorweed Noxious weed California: sessile joyweed Quarantine Florida: sessile joyweed Noxious weed Massachusetts: sessile joyweed Prohibited Minnesota: sessile joyweed Prohibited noxious weed North Carolina: sessile joyweed Class A noxious weed Oregon: sessile joyweed Quarantine South Carolina: sessile joyweed Plant pest Vermont: sessile joyweed Class A noxious weed U.S. Weed Information: Alternanthera sessilis (L.) R. Br. ex DC. sessile joyweed Alternanthera alligatorweed This plant and the related entity italicized and indented above can be weedy or invasive according to the authoritative sources noted below. This plant may be known by one or more common names in different places, and some are listed above. Click on an acronym to view each weed list, or click here for a composite list of Weeds of the U.S. US Plant Protection and Quarantine. 2010. Federal noxious weed list (1 May 2010). USDA Animal and Plant Health Inspection Service. Washington, DC. STATE Assorted authors. 200_. State noxious weed lists for 46 states. State agriculture or natural resource departments. Introduced Information: Alternanthera sessilis (L.) R. Br. ex DC. This plant is introduced to some part of the PLANTS Floristic Area, though it may be native in other parts. Click on link below for a partial or complete list of PFA introduced plants. |
گياهي يکساله که علاوه بر مزرعه در اب بندها ، داخل کانال ها و جويها مي رويد . سطح بذر آن صاف و رنگ آن سياه براق است.
منابع :
http://plants.usda.gov/java/profile?symbol=Alse4
http://iranagro.blogfa.com/cat-2.aspx
http://en.wikipedia.org/wiki/Alternanthera_sessilis
| Amaranthaceae - Alternanthera sessilis. From: Dictionnaire des sciences naturelles. Planches … Botanique classée d’après la méthode naturelle de M. Antoine-Laurent de Jussieu by Pierre Jean François Turpin. Paris & Strasbourg, F.G. Levrault, 1816-1829, volume 5, plate 194. Hand-coloured engraving after Turpin (sheet 120 x 213 mm). € 55 Pierre Jean François Turpin (1775-1840) was possibly the greatest botanical genius of all the French botanical painters of his day … In particular, his drawings of botanical details have rarely been surpassed. ... (Blunt). With Pierre-Antoine Poiteau he collaborated in some of the most important botanical publications of the early years of the nineteenth century. In the finely illustrated botanical part of the Dictionnaire … the plates by several engravers were issued uncoloured or coloured.* Pritzel 10.722; Nissen BBI 2239; Blunt p. 180 ff.; Stafleu & Cowan 1293 & 15.384. |
گل مرواریدی یا علف تمساح (Alternanthera sessilis) از تیره تاج خروس (Amaranthaceae):
یکساله، نیمه آبزی، ساقه با انشعابات زیاد، گسترده و تاحدودی ایستاده، گلها فشرده و متراکم در محل اتصال برگ به ساقه. ساقه کمی پرزدار به طول تا 60 سانتی متر، ریشه زا از محل بندها. برگها ساده، متقابل، واژ تخم مرغی تا بیضوی، بدون پرز، لبه دندانه های ظریف و انتهای برگ نوکدار. بذر عدسی شکل، سیاه براق. تکثیر با بذر. گل مرواریدی از علفهای هرز شایع مزارع برنج شمال کشور محسوب می شود. قدری دیر ظاهر گشته و به دلیل تمایل به گسترش در سطح زمین، از نظر سایه اندازی رقیب جدی برای برنج محسوب نمی شود. برخی گونه های جنس Alternanthera به عنوان گیاه زینتی و آکواریومی استفاده می شوند. از دیگر گونه های جنس Alternanthera که رفتار علف هرزی دارند می توان به A. filoxeroides اشاره کرد.
یکساله، نیمه آبزی، ساقه با انشعابات زیاد، گسترده و تاحدودی ایستاده، گلها فشرده و متراکم در محل اتصال برگ به ساقه. ساقه کمی پرزدار به طول تا 60 سانتی متر، ریشه زا از محل بندها. برگها ساده، متقابل، واژ تخم مرغی تا بیضوی، بدون پرز، لبه دندانه های ظریف و انتهای برگ نوکدار. بذر عدسی شکل، سیاه براق. تکثیر با بذر. گل مرواریدی از علفهای هرز شایع مزارع برنج شمال کشور محسوب می شود. قدری دیر ظاهر گشته و به دلیل تمایل به گسترش در سطح زمین، از نظر سایه اندازی رقیب جدی برای برنج محسوب نمی شود. برخی گونه های جنس Alternanthera به عنوان گیاه زینتی و آکواریومی استفاده می شوند. از دیگر گونه های جنس Alternanthera که رفتار علف هرزی دارند می توان به A. filoxeroides اشاره کرد.
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(شیرتیغی) sonchus asper
سلام دوست عزیز، مثل اینکه شما صفحه اول این تاپیک را نگاه کردید! الان ما صفحه 92 تاپیک هستیم و باید منتظر سوال جدید از طرف زیبا خانم باشیم...
مهنس زيبا
عكس ها باز نميشه گويا!
عكس ها باز نميشه گويا!
آره عکس ها باز نمیشه، لطفا دوباره بزارید...مهنس زيبا
عكس ها باز نميشه گويا!
اسم فارسیش سیزاب آبزی است و بیشتر اطراف مزارع برنج و جوی های آب دیده می شود. همچنین در برخی طبقه بندی ها این گونه را جزو خانواده گل میمون (Scrophulariaceae) آورده اند...
توضیحات:
یکساله یا پایا، به ارتفاع 20 تا 120 سانتی متر، ایستاده، بدون کرک. سبز مات. دارای ساقه ضخیم، علفی، چهارپر، توخالی، از قاعده بسیار منشعب با شاخه های متقابل و غالبا دارای شاخه های منتهی به گل آذین. برگها متقابل، بدون دمبرگ، کامل، سرنیزه ای، در قاعده قلبی، ساقه آغوش و کمی گوشه دار، برگهای پائینی دمبرگ دار. گلها به رنگ صورتی یا آبی کمرنگ یا نیلی متمایل به سفید، کوچک، مجتمع در خوشه های کناری یا انتهایی. دمگل 4 تا 8 میلی متر با 3-2 براکته نازک و نخی. سیزاب آبزی پراکنش زیادی در کشور دارد ولی تاکنون با تراکم های زیاد آن فقط در بعضی مزارع برنج استان فارس برخورد شده است.
تصاویر زیبای این گیاه را در لینک زیر ببینید:
http://www.maltawildplants.com/SCRO/Veronica_anagallis-aquatica.php
توضیحات:
یکساله یا پایا، به ارتفاع 20 تا 120 سانتی متر، ایستاده، بدون کرک. سبز مات. دارای ساقه ضخیم، علفی، چهارپر، توخالی، از قاعده بسیار منشعب با شاخه های متقابل و غالبا دارای شاخه های منتهی به گل آذین. برگها متقابل، بدون دمبرگ، کامل، سرنیزه ای، در قاعده قلبی، ساقه آغوش و کمی گوشه دار، برگهای پائینی دمبرگ دار. گلها به رنگ صورتی یا آبی کمرنگ یا نیلی متمایل به سفید، کوچک، مجتمع در خوشه های کناری یا انتهایی. دمگل 4 تا 8 میلی متر با 3-2 براکته نازک و نخی. سیزاب آبزی پراکنش زیادی در کشور دارد ولی تاکنون با تراکم های زیاد آن فقط در بعضی مزارع برنج استان فارس برخورد شده است.
تصاویر زیبای این گیاه را در لینک زیر ببینید:
http://www.maltawildplants.com/SCRO/Veronica_anagallis-aquatica.php
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استاد ممنون از توضيحات وعكسهاي گويا
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استاد سوال طرح ميكنيد،زيباخانم جواب ميدن،خانم ديوانعلي تشكر ميكنن
من سوال .... استاد.... خانم ديوانعلي مجددا.....
زيباخانم ....... من ...... خانم ديوانعلي.....
داستان چيه كه بقيه مفقودن
انشالله هركدوم هرجاهستن به سلامتي ولي يه جورايي اينجا اختصاصي شده .
تانظر بقيه چي باشه؟؟
ممنون، آره همینجوریه، البته گلابتون خانم هم هستند که خیلی خوب و فعال هستند که البته الان گرفتار امتحانات آخر ترم هستند، ایشون هم تا چند روز آینده پیداشون میشه... سوال بعد را لطفا بزارید...سلام به همگي
استاد ممنون از توضيحات وعكسهاي گويا
ميگم اينجا
استاد سوال طرح ميكنيد،زيباخانم جواب ميدن،خانم ديوانعلي تشكر ميكنن
من سوال .... استاد.... خانم ديوانعلي مجددا.....
زيباخانم ....... من ...... خانم ديوانعلي.....
داستان چيه كه بقيه مفقودن
انشالله هركدوم هرجاهستن به سلامتي ولي يه جورايي اينجا اختصاصي شده .
تانظر بقيه چي باشه؟؟
بله چشم هرچي شما بفرماييد
ولي متاسفانه اينترنت من قطع و وصل ميشه الان نميتونم عكس بزارم
در اولين فرصت اينكارو انجام ميدم
ولي متاسفانه اينترنت من قطع و وصل ميشه الان نميتونم عكس بزارم
در اولين فرصت اينكارو انجام ميدم
اميدوارم
تكراري نباشه
والبته خيلي آسون نباشه
به نظر دوستان اين چه علف هرزي مي باشد؟؟
مشاهده پیوست 105331مشاهده پیوست 105332
تكراري نباشه
والبته خيلي آسون نباشه
به نظر دوستان اين چه علف هرزي مي باشد؟؟
مشاهده پیوست 105331مشاهده پیوست 105332