Photo: Thelesperma megapotamicum.

Flowering plants. Bottomless lake, NM, US. Wild. 1998-06-01.
Thelesperma megapotamicum (Spreng.) Kuntze Engl.: Hopi tea greenthread, Indian tea, Navajo tea. Span.: cota. Bot. syn.: Bidens megapotamica Spreng., Thelesperma gracile (Torr.) Gray
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Photo: Thelesperma megapotamicum.