Asclepias pumila
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Asclepias pumila |
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| ( A.Gray ) Vail |
Asclepias pumila is a species of silk plants ( Asclepias ) from the subfamily of the silk plants (Asclepiadoideae).
description
Appearance and leaf
Asclepias pumila is a perennial herbaceous plant with a rhizome that extends deep into the ground . The slender, 5 cm to 30 cm (40 cm) high, finely downy hairy shoots do not branch or branch only a little below the surface of the earth. Only the crown of leaves is branched like a cluster.
The densely alternate and almost spiral, occasionally whorled and always ascending leaves are sessile. The thin leaf blades have a length of 2 to 4 cm and a diameter of about 1 mm and are usually strongly bent downwards and essentially bare.
Inflorescence and flower
The flowering period in the home area extends from June to September. The inflorescence is located on a 1 to 1.5 cm long inflorescence stem near the end of the shoot at the uppermost node . The multi-flowered, umbellate to umbellate inflorescences usually have a flat top. The slender flower stalks are about 1 cm long.
The comparatively small, hermaphrodite flowers are radial symmetry and five-fold. The five sparsely fluffy hairy or bald sepals are up to 1 mm long, lanceolate-triangular and only fused at their base. The white or slightly pink or yellowish-green tinted corolla is wheel-shaped and strongly bent back. The petals are 2 to 3 mm long. The cylindrical gynostegium , about 1 mm high and about 1 mm in diameter, is greenish-white. The ovoid staminal corolla lobes, which are about 1.5 mm wide, form a hood-shaped structure. The inner secondary processes are needle-shaped and about twice as long as the staminal corolla lobes. They gradually arch over the stylus head. The stylus head is cylindrical, 1.25 mm high and 1 mm wide.
Fruit and seed
The upstanding stems on upward follicles are at a length of 4 to 8 cm and a diameter of about 6 mm thin spindle-shaped. With a length of 4 to 6 mm wide, the oval seeds have a 2.5 cm long, white head of hair. The fruits and seeds ripen from August to October.
Synecology
The pollination is done by bees , butterflies and other insects.
Asclepias pumila is poisonous to grazing animals.
hybrid
In the east of the distribution area, hybrids with Asclepias verticillata can occasionally form . These hybrids form lateral lobes on the corolla lobes.
Occurrence
Asclepias pumila occurs on the Great Plains from North Dakota and Montana in the north to Texas in the south, and from South Dakota , Iowa , Kansas , Nebraska and Oklahoma in the east to Wyoming , Colorado and New Mexico in the west and southwest. Asclepias pumila thrives on sandy, clayey or stony-chalky or gypsum-rich soils .
swell
literature
- Robert E. Woodson, Jr .: The North American Species of Asclepias L. In: Annals of the Missouri Botanical Garden. Volume 41, No. 1, 1954, pp. 1-211, here: pp. 71/72 ( digitized version ).
Individual evidence
- ↑ a b c Asclepias pumila at Plants For A Future
- ↑ a b c Asclepias pumila USDA, NRCS. 2011. The PLANTS Database. National Plant Data Team, Greensboro, NC 27401-4901 USA.
