Asclepias sullivantii
Asclepias sullivantii
Asclepias sullivantii is a plant of the genus milkweed ( Asclepias ) from the subfamily of milkweed plants ( Asclepiadoideae ).
- 4.1 Literature
- 4.2 Notes and references
Features
Vegetative characteristics
Asclepias sullivantii is a perennial, herbaceous, upright growing plant with a deep -reaching, fleshy taproot. The stiff, year shoots are unbranched, 60 to 90 cm (40 to 110 cm ) tall and bald. They are easily coated with a waxy substance. They die in the fall off completely and drive in the spring from the rootstock again. The leaves are very short petiolate to sessile, and arranged confessed. The festhäutigen to slightly succulent leaf blades are broad - ovate to broadly elliptical or oblong- lanceolate; 9-15 cm long and 2-9 cm wide. The outer end is wide - butt tapering to rounded, base broadly rounded to broad and flat to slightly cordate amplexicaul. They are bare and slightly coated waxy. The edges are slightly wavy. The mean leaf vein is slightly pinkish or reddish. The leaf blades are oriented in relation to the stem axis strongly upwards.
Inflorescence and flowers
The stalked flower heads sit on the side of the upper nodes present. They are usually many flowered (up to about 20 flowers per inflorescence) and spherical. The bare stems are strong and 1-6 cm long. The flowers are rather large with 2 to 4 cm long stalks. The sepals are lanceolate - elliptical, 5-6 mm long. The corolla is wheel-shaped with strongly recurved, purple to rose-colored petals. The tip of 9 to 11 mm long. The row Nebenkrone is stalked pale pink and short. The handle is wide - verkehrtkonisch, about 2 mm long and 2.5 to 3 mm wide. The hood -shaped tip of the corona are in outline broad ovoid and 5-6 mm long. The horn-shaped secondary appendages to rest against the inner sides of the ears; they are slightly shorter than lobes. They are crescent- shaped and abruptly curved inward at the outer end. The stylus head is conical in shape with a flattened top; he is 3 mm long and 4 mm wide.
Fruit and seeds
The follicles stand upright on U- shaped curved stems. They are thick - fusiform, 8-10 cm long and short beaked. The surface is usually more or less prickly and very finely pubescent to glabrous. The seeds are broadly elliptical, provided about 8 mm long and with a white, 4.5 cm of hair.
Geographical distribution and ecology
The range of the species extends over the prairies of southern Canada (Ontario ) over the midwestern United States (Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, Oklahoma, South Dakota, Wisconsin ) to to Arkansas. It grows into something more humid prairies, alluvial meadows, and low -lying country; but also spreads along the roadsides. The flowering period is from June to August.
Taxonomy
The taxon was described in 1848 by Asa Gray from a manuscript or manuscript name of George Engelmann first time. There are no known synonyms.