Nabalus albus (Linnaeus) Hooker. Northern Rattlesnake-root. Phen: Jul-Nov. Hab: Forests, especially over calcareous substrates. Dist: ME west to MB, south to ne. NC, w. NC, WV, MO, and n. AR. Reports of N. albus from the Coastal Plain of NC and perhaps VA are based on P. alba ssp. pallida, which is invalidly published; additionally, specimens attributed to this taxon appear to belong to P. trifoliolata.

Origin/Endemic status: Native

Synonymy: = Il, K3, K4, NE, NY, S, Tn, Va; = Prenanthes alba L. – Ar, C, F, FNA19, G, GrPl, K1, Mi, Oh3, Pa, SE1, Tat, W, Johnson (1980); = Prenanthes alba L. ssp. alba – RAB

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: FACU
• Eastern Mountains and Piedmont: FACU
• Great Plains: FACU
• Midwest: FACU
• Northcentral & Northeast: FACU

Heliophily: 4