1	"leaf blades thin, membranous, wider than linear; caryopses trigonal in cross-section; sulcus present, deep, with nearly vertical walls; 1 or 2 lateral bundle sheath cells on each side evidently enlarged"	Trigonochloa
1	"Leaf blades thicker, more or less linear; caryopses lenticular to terete in cross section; sulcus absent or shallow; enlarge lateral bundle sheath cells lacking"	2
2	"Ligules 4-8(-15) mm long, acute to attenuate, lacerate only by tearing"	Diplachne
2	"Ligules 0.2-8.0(-15.) mm long, usually truncate to obtuse and somewhat erose"	3
3	"Tips of lemma hairs clavicornuculate, ovate to broadly ovate; lemma bases often indurate and sometimes 5-veined; plants perennial; ligules 0.8-2.2 mm long, erose"	Disakisperma
3	"Tips of lemma hairs ovate to acute, never clavicorniclate; lemma bases soft, always 3-veined; plants annual or perennial; ligules (0.2-)0.5-5.5(-7.0) mm long, usually entire"	4
4	"Panicle branches digitate to subdigitate, usually with 2 or more branches per node; lemmas 1- or 3-awned or unawaned; plants perennial; culms solid; ligules 0.5-3 mm long, ciliate"	Leptochloa
4	"Panicle branches racemeosely on the rachises, rarely digitate to subdigitiate, usually with a single branch per node; lemmas unawned; plants annual or perennial; culms solid or hollow; ligules (0.2) 0.5-5.5(-7.0_ mm long, erose or entire, never ciliate"	Dinebra