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Pterocaulon Elliott. Wingstem, Blackroot.

Key to Pterocaulon

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.

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