Asclepias barjoniifolia
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Asclepias barjoniifolia |
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| Asclepias barjoniifolia | ||||||||||||
| E. Fourn. |
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Asclepias barjoniifolia 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 barjoniifolia grows as a perennial herbaceous plant or low shrub and reaches heights of up to 1 meter. The milky sap (latex) is white. Several upright stems emerge from a slightly woody base with pronounced ridges between the attachment points of the petioles. They are smooth or finely hairy and often reddish.
The petioles are very short. With a length of usually 3 to 8 (rarely up to 10) cm and a width of 1 to 3 (rarely up to 4) cm, the shape of the smooth, hairless, semi-succulent and somewhat leathery leaf blades varies from oval to oblong-egg-shaped with a heart-shaped blade base and a pointed end. The side nerves, which run almost parallel, depart from the midrib at an angle of about 60 °.
Generative characteristics
Usually 15 to 30 (rarely up to 50) are heaped in several places and form a pseudo-dold-like inflorescence . The relatively short inflorescence stem is smooth or hairy downy. The flower stalks are 1.5 to 2.5 cm long.
The hermaphrodite flowers are radially symmetrical and five-fold. The five sepals are elongated-ovoid with a pointed end with a length of 1.5 to 4 and a width of 0.5 to 1 cm. The five petals are completely bent back. The 4 to 5 mm long and 1.5 to 2 mm wide corolla lobes are hairless, pointed at the end and often slightly incised. The color of the corolla and corolla is bright yellow. The gynostegium sits on a short, 0.5 mm long stem. The corolla lobes protrude beyond the stylus head. The upright and fleshy corolla lobes are approximately cylindrical with a rounded, somewhat widened tip with a length of 3 to 4 mm and a width of about 1 mm. The slender, sickle-shaped tooth starts in the recess of the tip and bends over the stylus head.
The single and upright follicles are 4 to 9 cm long and about 1 cm in diameter, slender-ovoid to spindle-shaped. The flattened, 5 to 6 mm long and 2.5 mm wide seeds have about 2 cm long, white head of hair.
Occurrence
Asclepias barjoniifolia occurs only in central Bolivia from the old Cochabamba - Santa Cruz road south to the province of Tucumán in northern Argentina . It thrives there at altitudes of mostly 1600 to 3400 meters, rarely descending to 800 meters, on hot, dry slopes in some valleys of the Andes .
Systematics
The first description of this species was in 1882 with the misspelled specific epithet barjoniaefolia by Eugène Fournier in Annales des Sciences Naturelles; Botanique , sér. 6, 14, pp. 372-373. Synonyms for Asclepias barjoniifolia E. Fourn. are: Asclepias cochabambensis Rusby, Asclepias fiebrigii Schltr., Asclepias kuntzei Schltr., Asclepias ramosa E. Fourn.
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literature
- David Goyder: Asclepias barjoniifolia Apocynaceae: Asclepiadoideae . In: Curtis's Botanical Magazine , Volume 24, No. 2, 2007, pp. 93-100, doi : 10.1111 / j.1467-8748.2007.00569.x .
Individual evidence
- ^ Asclepias barjoniifolia at Tropicos.org. Missouri Botanical Garden, St. Louis
