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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Avena

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1 Florets disarticulating from the glumes at maturity (the glumes remaining attached to the plant); lemmas pubescent with brown hairs; lemmas with long bent awns; callus bearded with hairs up to ΒΌ as long as the lemmas
1 Florets not disarticulating from the glumes at maturity; lemmas glabrous or scabrous (rarely sparsely strigose); lemmas unawned or with relatively straight awns; callus glabrous