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hairy crabgrass

Habit Plants annual, 20–70(112)cm tall, tufted or sometimes mat-forming.
Leaves

sheaths with sparse papillose-based hairs;

blades 2–11(14) cm × 3–8(12) mm; flat, usually with papillose-based hairs on both surfaces, sometimes glabrous.

Inflorescences

often purple, with 4–13 spike-like primary branches 3–30 cm × 0.7–1.5 mm, ascending to spreading.

Spikelets

1.7–3.4 mm.

Glumes

lower glumes 0.2–0.4 mm;

upper glumes 0.9–2 mm, 33–50% as long as the spikelets, 3-veined, pubescent on the margins.

Lemmas

lower lemmas less than to 0.2 mm longer than the upper floret, glabrous, 7-veined;

lateral or all veins scabrous throughout or smooth on the lower 33–50% and scabrous distally, 3 middle veins usually widely spaced; outer veins tightly spaced and near the margins; upper lemmas 1.7–3 mm, yellow or gray, often purple-tinged when young and becoming brown at maturity.

Anthers

0.5–0.9 mm.

2n

=36, 28, 34, 54.

Digitaria insularis

Digitaria sanguinalis

Distribution
[WildflowerSearch map]
[BONAP county map]
[WildflowerSearch map]
[BONAP county map]
Discussion

Disturbed areas, lawns, roadsides. 0–1400m. Col, CR, ECas, Est, Sisk, WV. CA, ID, NV, WA; throughout most of North America; worldwide. Exotic.

Digitaria sanguinalis is a common, late-season weed characterized by its spike-like branches that spread like the spokes of an umbrella. The very similar D. ischaemum lacks hairs on most of its foliage. Cynodon has a similar though more delicate inflorescence, but it is a strongly stoloniferous perennial.

Source Flora of Oregon, volume 1, page 391
Barbara Wilson, Richard Brainerd, Nick Otting
Sibling taxa
D. ischaemum, D. sanguinalis
D. ischaemum
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