Asclepias cordifolia
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Asclepias cordifolia |
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| Asclepias cordifolia | ||||||||||||
| ( Benth. ) Jeps. |
Asclepias cordifolia , seldom also called heart-leaved silk flower, is a species of the genus silk plants ( Asclepias ) from the subfamily of silk plants (Asclepiadoideae).
description
Appearance and foliage leaf
Asclepias cordifolia grows as a perennial , herbaceous plant and reaches heights of 20 to 80 cm. The stiff, simple stems are often somewhat flattened on the sides, blue-green in color and bare.
The opposite, rarely threesome, lively leaves arranged on the stem are sessile, i.e. sitting. The tight-skinned or slightly succulent leaf blade is egg-shaped with a broad, heart-shaped blade base that surrounds the stem and a pointed or rather blunt end.
Inflorescence and flower
The flowering period extends from April to June. At the highest node ( Nodien are) of the stem and terminally doldigen inflorescences formed; they are multicolored to many-flowered and glabrous. The solid inflorescence stem is up to 7 cm long or absent. The thread-like flower stalk is 2 to 4 cm long.
The relatively small, hermaphrodite, radial symmetry , five-fold flowers are purple or purple. The five sepals are ovate-lanceolate, about 3 mm long and glabrous. The five petals are bent back. The petal lobes are 6 to 8 mm long. The white to light pink gynostegium sits on a short, broadly conical, approximately 1.5 mm high stem, which has a diameter of 2.5 mm. The staminal corolla lobes are sack-shaped, about 3 mm long, but trimmed with distinct lateral auricles (auricles). Interstaminal coronary lobes are absent.
Fruit and seeds
The upright on upright or downwardly curved stems, bare follicles are slim-spindle-shaped with a length of 7 to 12 cm and a diameter of 1.5 to 2 cm. The seeds are about 8 mm long, broadly egg-shaped and have a 3 to 3.5 cm long, white head of hair.
ecology
Asclepias cordifolia is an important food plant for the caterpillars of the monarch butterfly ( Danaus plexippus ).
Occurrence
Asclepias cordifolia is found in the United States in the states of California, Nevada and Oregon. It grows there at the foot of slopes, on stony slopes, in mountain forests and in the chaparral .
Systematics
The first description was made of this kind in 1849 under the name Acerates cordifolia by George Bentham in Plantas Hartwegianas Imprimis Mexicanas , p 323. It was in 1901 under the name Asclepias cordifolia by Willis Linn Jepson in A Flora of Western Middle California , S. 384 in the genre Asclepias posed. Other synonyms for Asclepias cordifolia (Benth.) Jeps. are: Acerates atropurpurea Kellogg , Asclepias acornuta Kellogg , Gomphocarpus cordifolius (Benth.) Benth. ex A. Gray .
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 (description of Asclepias cordifolia on pp. 173–175)
- Willis Linn Jepson: A Flora of Western Middle California , Encina Publishing Company, Berkeley, Cal., 1901, 625 S. (Description of Asclepias cordifolia on p. 384 online at Archive.org )
- James C. Hickman (Ed.): The Jepson Manual. Higher Plants of California . University of California Press, Berkeley, Calif 1993, ISBN 0-520-08255-9 . Asclepias cordifolia - Carol A. Hoffman: Asclepiadaceae in Jepson Manual Treatment - Online. (Section Description and Distribution)
Individual evidence
- ↑ Common name heart-shaped silk flower.
- ↑ H. Dingle, MP Zalucki, WA Rochester and T. Armijo Prewitt: Distribution of the monarch butterfly, Danaus plexippus (L.) (Lepidoptera: Nymphalidae) in western North America. , In: Biological Journal of the Linnean Society , 85 (4), pp. 491-500, 2005 doi : 10.1111 / j.1095-8312.2005.00512.x
