Nabhan et al 2015
Duration: Perennial Nativity: Native Lifeform: Forb/Herb General: Erect perennials with smooth stems, to 1 m tall. Leaves: The persistent leaves are whorled with 3-5 leaves at each node, each of these are narrowly linear with a tapered base, these are less than one inch wide but usually smaller and 4.5 inches long, smooth on top. Flowers: In axillary and terminal umbels with many greenish-white and purple tinged flowers. The umbels are rounded on top and made up of numerous flowers with grayish pink to nearly white but greenish corolla. Fruits: The upright pod is smooth and 2-5 inches long and slender, less than a half inch wide. Ecology: Found in a range of soils from moist to very dry sites, from 150 to 7,500 ft (46-2286 m); flowers May through October. Distribution: WA south through CA into Baja California. Notes: This species is a known Monarch host plant. Synonyms: Asclepias mexicana, Asclepias macrophylla, Asclepias fasciculata Editor: AHazelton 2015
