Asclepias sullivantii
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Asclepias sullivantii |
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| Asclepias sullivantii | ||||||||||||
| Engelm. ex A. Gray |
Asclepias sullivantii is a species of silk plants ( Asclepias ) from the subfamily of the silk plants (Asclepiadoideae).
features
Vegetative characteristics
Asclepias sullivantii is a perennial , herbaceous , upright plant with a deep, fleshy taproot. The stiff, annual shoots are unbranched, 60 to 90 cm (40 to 110 cm) tall, and bare. They are lightly coated with a waxy substance. They die off completely in autumn and sprout again from the rootstock in spring. The leaves are very short stalked to sessile and arranged in a confessing manner. The firm-skinned to slightly succulent leaf blades are broadly ovate to broadly elliptical or oblong-lanceolate; 9 to 15 cm long and 2 to 9 cm wide. The outer end is broadly blunt to tapering to rounded, the base broadly rounded to broad and flat heart-shaped to slightly encompassing the stem. They are bare and have a slightly waxy coating. The edges are slightly wavy. The middle leaf vein is slightly pink or reddish. The leaf blades are directed strongly upwards in relation to the stem axis.
Inflorescence and flowers
The stalked inflorescences sit laterally on the upper nodes . They are usually multi-flowered (up to about 20 flowers per inflorescence) and spherical. The bare stems are sturdy and 1 to 6 cm long. The flowers are rather large with 2 to 4 cm long stems. The sepals are lanceolate-elliptical and 5 to 6 mm long. The corolla is wheel-shaped with strongly bent back, purple-colored to rose-colored petals. The tips are 9 to 11 mm long. The single row corolla is pale pink and has a short stalk. The stalk is broadly inverted, approximately 2 mm long and 2.5 to 3 mm wide. The hood-shaped tips of the secondary crown are broadly ovoid in outline and 5 to 6 mm long. The horn-shaped secondary processes lie on the inside of the lobes; they are slightly shorter than the tip. They are crescent-shaped and curved abruptly inward at the outer end. The stylus head is conical in shape with a flattened top; it is 3 mm long and 4 mm wide.
Fruits and seeds
The follicles stand upright on U-shaped curved stems. They are thick and spindle-shaped, 8 to 10 cm long and have short beaks. The surface is usually more or less prickly and very finely hairy to bald. The seeds are broadly elliptical, about 8 mm long and provided with a white, 4.5 cm head of hair.
Geographical distribution and ecology
The range of the species extends over the prairies from southern Canada ( Ontario ) over the midwest of the USA ( Illinois , Indiana , Iowa , Kansas , Michigan , Minnesota , Missouri , Nebraska , North Dakota , Ohio , Oklahoma , South Dakota , Wisconsin ) to to Arkansas . It grows there on somewhat wetter prairies, alluvial meadows, and low-lying land; but also spreads on the roadsides. The flowering period is from June to August.
Taxonomy
The taxon was first described in 1848 by Asa Gray after a manuscript or manuscript name by George Engelmann . No synonyms are known.
supporting documents
literature
- Robert E. Woodson, Jr .: The North American Species of Asclepias L. In: Annals of the Missouri Botanical Garden , Vol. 41, No. 1, 1954, pp. 1-211, St. Louis, Mo. URL (pp. 115/6)
Individual evidence
- ↑ MR Penskar, PJ Higman: Special plans for abstract Asclepias sullivantii (Sullivantís milkweed). Michigan Natural Features Inventory, Lansing, MI. 2 pp., 2000 PDF
- ↑ United States Department of Agriculture - Plants Profile: Asclepias sullivantii Engelm. ex A. Gray prairie milkweed
- ↑ Asa Gray, William Starling Sullivant: A manual of the botany of the northern United States, from New England to Wisconsin and south to Ohio and Pennsylvania inclusive, (the mosses and liverworts by Wm. S. Sullivant), arranged according to the natural system. 710 S., Boston, J. Munroe & London, J. Chapman, 1848. Online at www.biodiversitylibrary.org (p. 366/7)
- ↑ Rafael Govaerts (ed.): World Checklist of Selected Plant Families (in review): Asclepias. Published in: The Plant List. A working list of all plant species. Royal Botanic Gardens Kew, Missouri Botanical Garden, accessed May 24, 2013.
