| Author | (L.) Koeler | |
| Distribution | Essentially throughout the state.
Southern NH to southern IA, south to FL and TX. | |
| Abundance | Uncommon to frequent nearly throughout, but scarce in the northeastern counties (under-collected?). | |
| Habitat | Dry sandy clearings, roadsides, powerlines, fields. | |
| Phenology | Flowering and fruiting September-October. | |
| Identification | This 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 Comments | Our plants belong to var. filiformis.
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| Other Common Name(s) | Slender Fingergrass | |
| State Rank | S4 [S5] | |
| Global Rank | G5 | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
