Asclepias asperula

Family: Apocynaceae
Common Name: antelopehorn /spider milkweed
Symbol: ASAS
Description: Perennial. Vegetative parts typically roughened with a fine pubescence; stems ascending to rather decumbent, unbranched, 10-80 cm tall; milky sap. Leaves irregularly alternate, the blades lanceolate to less often linear-lanceolate, 5-19 cm long, 6-27 mm broad, acute or infrequently obtuse at the base. Inflorescence umbelate, solitary and terminal, 4-7 cm broad. Flowers large; calyx lobes 3-6 mm long; corolla greenish, uncommonly purple-tipped, bowl-shaped, the lobes curved-ascending, 9-12 mm long.