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.
1 Inflorescence verticillate, typically the panicle branches in 2-5 verticils; perennial; fertile lemma inconspicuously appressed-pilose; spikelets not imbricate
1 Inflorescence digitate, the panicle branches in a single verticil at the apex of the culm; annual; lemma conspicuously long-ciliate; spikelets imbricate