Jepson eFlora
Key to families | Table of families and genera

Key to Echinochloa

View taxon page for Echinochloa

1. Lower lemma generally unawned; spikelets, especially those near the base of inflorescence, not breaking free at maturity; upper lemma > upper glume in length, width ..... [E. esculenta]

1' Lower lemma often awned; spikelets breaking free at maturity; upper lemma < to ± > upper glume in length, width

2. Stem erect, densely tufted; spikelets 3.7–7 mm; plants resembling rice vegetatively, closely associated with rice cultivation ..... E. oryzoides

2' Stem sprawling, decumbent or erect; spikelets 2–5 mm; plant occasionally resembling rice vegetatively but, if so, the spikelets < 3 mm; plants generally not associated with rice cultivated, in wet, disturbed places and cultivated fields

3. Inflorescence branches 0.7–2(4) cm, without 2° branches; spikelet 2–3 mm, unawned ..... E. colona

3' Inflorescence branches 1–14 cm, generally rebranched, 2° branches often short and inconspicuous; spikelet 2.5–5 mm, awned or not

4. Upper lemma broadly obovate, acute or acuminate, tip not sharply differentiated, not early withering; inflorescence generally erect, branches generally spreading ..... E. muricata var. microstachya

4' Upper lemma narrowly elliptic to broadly ovate, acute or obtuse, tip withering, differentiated from lemma body by a line of minute hairs or not; inflorescence erect to strongly drooping

5. Inflorescence spreading to erect, occasionally nodding, not drooping 180°, 2° branches generally inconspicuous; awns straight or irregularly bent, <= 10 mm and only at branch tips or <= 50 mm and throughout inflorescence ..... E. crus-galli

5' Inflorescence generally drooping 180°, 2° branches to 3 cm; awns curved, 3–15 mm, throughout inflorescence ..... E. crus-pavonis var. crus-pavonis

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