Vascular Plants of North Carolina
Account for Slender Crabgrass - Digitaria filiformis   (L.) Koeler
Members of Poaceae:
Members of Digitaria with account distribution info or public map:
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Section 5 » Order Cyperales » Family Poaceae
Author(L.) Koeler
DistributionEssentially throughout the state.

Southern NH to southern IA, south to FL and TX.
AbundanceUncommon to frequent nearly throughout, but scarce in the northeastern counties (under-collected?).
HabitatDry sandy clearings, roadsides, powerlines, fields.
PhenologyFlowering and fruiting September-October.
IdentificationThis species is much like the alien Hairy Crabgrass (D. sanguinalis), but it is noticeably slender in all respects. The branch (rachis) along which the spikelets grow is slender and not winged (vs. 0.5-1.0 mm wide, with wings as wide as the rachis itself in that species). Shaggy Crabgrass (D. villosa) differs mainly in it having larger spikelets (2.0-2.8 mm long vs. 1.7-2.2 mm long in D. filiformis); that species also has longer racemes (to 10 inches long vs. only to 4 inches long in D. filiformis).
Taxonomic CommentsOur plants belong to var. filiformis.

Other Common Name(s)Slender Fingergrass
State RankS4 [S5]
Global RankG5
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