Asclepias eriocarpa
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Asclepias eriocarpa |
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| Asclepias eriocarpa | ||||||||||||
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Asclepias eriocarpa is a species of silk plants ( Asclepias ) in the subfamily of the silk plants (Asclepiadoideae) within the family of dog poison plants (Apocynaceae).
description
Vegetative characteristics
Asclepias eriocarpa grows as a perennial herbaceous plant that reaches heights of 40 to 100 cm. The simple, rarely branched stems have a surface that is densely hairy white in the upper parts and increasingly hairless in the lower parts.
The opposite or irregularly alternate arranged on the stem leaves are short stalks (stems 0.5 to 1 cm long). The thin but firm leaf blade is 8 to 20 cm long and 3 to 8 cm wide and is elongated to ovoid with a rounded, blunt or flat-heart-shaped blade base and a pointed or blunt end. The upper side of the leaf is densely hairy and the underside of the leaf is usually slightly less hairy. They are often curved upwards at the midrib. The leaf margins are often wavy.
Generative characteristics
The flowering period extends from June to August. The inflorescence forms on the side of one of the uppermost nodes. The dense, white hairy inflorescence stem is 1 to 10 cm rather than long. The moderately large flowers are hermaphroditic, radial symmetry and five-fold. The five sepals are ovate-lanceolate and finely hairy with a length of 4 to 5 mm. The greenish to yellowish-cream-colored, sometimes pink-colored corolla is wheel-shaped and the edges are turned outwards. The crown lobes are 7 to 9 mm long. The short stalked gynostegium is cream colored, often with a slight rose tint. The stem is about 1 mm long and 2 mm wide. The corolla lobes are very broad and ovate with a length of 3 to 4 mm. The horn-shaped secondary process lies tightly over the entire route and is broadly sickle-shaped and slightly longer than the staminal corolla lobes. The stylus head is conical, cut off at the top and about 3 mm long and about 4 mm wide.
The follicles , which stand upright on stems that are still bent at the top, are 5 to 9 cm long and 2 to 3 cm wide and are spindle-shaped and slightly pointed at the top. Their surface is smooth and fine, hairy white. The egg-shaped seeds, which are 8 to 9 mm wide, have a 1.5 to 3 mm long, light brown head of hair.
Occurrence
Asclepias eriocarpa occurs only in the US states of California and Nevada and in the Mexican state of Baja California . It grows there on stony, dry soils , often along roadsides and other human-influenced areas. It thrives at altitudes of 200 over 1900 meters.
Toxicity
Asclepias eriocarpa , like most species of the genus Asclepias, is toxic. Grazing animals usually avoid these plants. However, the toxicity of the individual species is quite different. Asclepias eriocarpa is relatively very poisonous. In animal experiments it has been found that as little as 0.05% to 0.25% of the animal weight of Asclepias eriocarpa plant material is sufficient to kill a sheep.
swell
literature
- Robert E. Woodson, Jr .: The North American Species of Asclepias L. , In: Annals of the Missouri Botanical Garden , 41 (1), St. Louis, Mo., 1954, pp. 1-211: URL
Individual evidence
- ^ A b The Jepson Herbarium University of California, Berkeley
- ↑ JM Benson, JN Seiber, CV Bagley, RF Keeler, AE Johnson and Stuart Young: Effects on sheep of the milkweeds Asclepias eriocarpa and A. labriformis and of cardiac glycoside-containing derivative material. , In: Toxicon , 17, 1979, pp. 155-165. doi : 10.1016 / 0041-0101 (79) 90294-0
