Digitaria insularis |
Digitaria sanguinalis |
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hairy crabgrass |
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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. |
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Inflorescences | often purple, with 4–13 spike-like primary branches 3–30 cm × 0.7–1.5 mm, ascending to spreading. |
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Spikelets | 1.7–3.4 mm. |
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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. |
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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. |
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Anthers | 0.5–0.9 mm. |
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2n | =36, 28, 34, 54. |
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Digitaria insularis |
Digitaria sanguinalis |
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Distribution | ||
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. |
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Source | Flora of Oregon, volume 1, page 391 Barbara Wilson, Richard Brainerd, Nick Otting |
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Sibling taxa | ||
Web links |
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