Dichanthelium commonsianum (Ashe) Freckmann
Common Name: PANIC GRASS
Synonym: Panicum commonsianum
Coefficient of Conservatism: 6
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Grass

Panicum commonsianum of Michigan Flora.

Sand barrens, low dunes, open oak and pine forests, shores.

This is typically a species of the Coastal Plain from Massachusetts to Florida, represented inland by var. euchlamydeum (Shinners) Pohl. Our plants referred here are quite variable in amount of pubescence and length of ligule, but are recognized by the double vestiture (both long and short hairs on sheaths, culms, and lower surfaces of blades) and large spikelets (compared with those of D. columbianum and D. meridionale, our other related species with double vestiture). The ligule consists of a dense fringe of short hairs (ca. 1 mm or less) and may have long hairs in addition (up to 5 mm).

Dichanthelium oligosanthes has sparse pubescence, usually distinctly double, but is quite a different looking species. Rare specimens of D. oligosanthes with unusually small spikelets may run here in the key, if not recognized. However, the spikelets are nearly all green (purple tinting only near the base) and much broader, being (1.6–) 1.7–2.2 mm broad and about 1.5–1.8 times as long. In the more pubescent D. commonsianum, the spikelets are ± strongly flushed with maroon and substantially narrower, ca. 1–1.3 mm wide, and about twice as long.


Allegan County
Barry County
Benzie County
Berrien County
Grand Traverse County
Iosco County
Kent County
Leelanau County
Mason County
Menominee County
Missaukee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oceana County
Van Buren County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. August 19, 2022. https://michiganflora.net/species.aspx?id=2070.