Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
Usually associated with open calcareous areas, such as limestone pavements and sandy, gravelly or rocky shores.
Most Michigan collections of this rather dwarf species are var. parvula, but ones from a gravelly bank along a highway in Menominee Co. (in 1984) and from a railroad embankment at East Lansing (Ingham Co. (in 1922 and 1923) are var. missouriensis (Torr.) Goodman & C.A.Lawson (var. leonardii (Epling) Fernald), sometimes treated at specific rank as S. leonardii Epling. This differs from var. parvula in having only tiny incurved eglandular hairs on the stem and eglandular hairs on the calyx; in var. parvula there are straight, erect, gland-tipped hairs on stem and calyx (overtopping any shorter hairs).