Common Name:
MARBLEWEED, FALSE GROMWELL
Synonym:
Onosmodium molle
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Coefficient of Conservatism:
6
Coefficient of Wetness:
5
Wetness Index:
UPL
Physiognomy:
Nt P-Forb
Status:
X
J. Kelly
Onosmodium molle of Michigan Flora
Collected at Niles in 1838 by the First Survey (GH); not found in Michigan again, but relatively widespread in Ontario and Wisconsin and to be sought in dry places or on banks and shores.
We follow Cohen & Davis (2009) in uniting Onosmodium with Lithospermum. The long-styled flowers with straight acute corolla lobes are distinctive among our Lithospermum species. In fruit, this has much the appearance of a robust L. officinale, but has larger nutlets ca. 3.2–4.5 mm long; L. officinale has the nutlets ca. 2.5–3.2 mm long. The spreading pubescence is also distinctive; all our other species have the pubescence ± appressed.