Coefficient of Conservatism:
Coefficient of Wetness:
B. S. Slaughter
Collected August 2, 1837, on the Sturgis Prairie, St. Joseph Co. The species is (or was) here at the northeastern edge of its range and has not been found in Michigan since.
Polytaenia blooms in June, so that the characteristic thick-margined fruit is ripe by August. There is no stylopodium, and the slender styles attain a length of 1.5–2 mm.