Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Hedyotis nigricans of Michigan Flora.
An 1889 collection by J. M. Milligan, labeled only as from “Branch Co., Mich.” (US) is somewhat suspicious; there are no other known Michigan specimens, although the species is locally common as close to this state as central Indiana and Ottawa and Erie Cos., Ohio, on the Erie Islands and nearby mainland, especially on outcrops and in quarries. The preferred habitat of this species, rocky or gravelly ledges and cliffs, especially in limestone areas, does occur uncommonly in Branch Co.
Terrell (2001) outlines the systematics of Stenaria.