Page authors: Don Knoke, David Giblin
Panicum dichotomiflorum
fall panicum

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlanitc Coast.

Habitat: Disturbed, often wet sites including stream banks and roadsides.

Flowers: May-September

Origin: Introduced from eastern and central Washington

Growth Duration: Annual, Perennial

Conservation Status: Not of concern

Pollination: Wind


Annual, branching from the base, the culms somewhat decumbent, up to 1 m. tall.


Sheaths open, usually glabrous; articulation below the glumes; ligules 2-3 mm. long; blades 5-12 mm. broad, usually glabrous.


Inflorescence an open panicle 1.5-3 dm. long, the branches ascending; spikelets 2-flowered, about 2.5 mm. long; first glume oval, less than 1 mm. long; second glume acute, faintly 9-nerved; lower lemma sterile, with a translucent palea 1-1.5 mm. long; hardened, fertile upper lemma and palea enclosed by the second glume and sterile lemma

Accepted Name:
Panicum dichotomiflorum Michx.
Publication: , Fl. Bor.-Amer. (Michaux) 1: 48. 1803.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Panicum dichotomiflorum in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Panicum dichotomiflorum checklist entry

OregonFlora: Panicum dichotomiflorum information

E-Flora BC: Panicum dichotomiflorum atlas page

CalPhotos: Panicum dichotomiflorum photos

20 photographs:
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