Pterocaulon Elliott. Wingstem, Blackroot.
A genus of about 18 species, herbs, of tropical, subtropical, and warm temperate America, and of Oceania and se. Asia.
ID notes:Pterocaulon is an unmistakable plant, the stems and leaf undersurfaces creamy-white floccose-tomentose, the leaf bases decurrent down the stem, the heads in oblong, terminal spikes, the tip nodding before anthesis.
Ref: Arriagada (1998); Cabrera & Ragonese (1978); Cronquist (1980); Diamond (2020); Nesom (2006p) In Flora of North America Editorial Committee (2006a). Show full citations.
Hover over a shape, letter, icon, or arrow on the map to see what it means. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.
© Scott Ward |