Spikelet pairs or triplets komogamous (spikelets in the unit sexually alike) or beterogamous (spikelets in the unit sexually dissimilar) spikelets of unequally pedicellate pairs usu¬ally homogamous and homomorphic spikelets in sessile-pedicellate pairs or triplets usually heterogamous and heteromorphic sessile spikelets usually bisexual pedicellate spikelets usually smaller than the sessile spikelets, often staminate or sterile, sometimes absent. Spikelets in unequally pedicellate pairs, sessile-pedicellate pairs, or triplets, or apparently solitary and sessile, pedicellate spikelets and sometimes the pedicels reduced or absent, triplets usu-ally with 1 sessile and 2 pedicellate spikelets, terminal spikelet units on the branches often with 2 pedicellate spikelets even if the others have only 1 (all spikelet units with 2 sessile and 1 pedicellate spikelets in Polytrias). Inflorescences terminal, frequently on both the culms and their branches, sometimes also axillary, usually of 1-many spikelike branches, these in digitate clusters of 1-13+ on a peduncle or attached, directly or indirectly, to elongate rachises, often partially to almost completely enclosed by the subtending leaf sheath at maturity, in some taxa axillary inflorescences composed of multiple-stalked pedunculate clusters of inflorescence branches subtended by a modified leaf disarticulation usually in the branch axes beneath the sessile florets, the dispersal unit being a sessile floret, the internode to the next sessile floret, the pedicel, and the pedicellate spikelet (branches with disarticulating axes are termed rames in the following accounts), sometimes beneath the glumes, the branch axes remain¬ing intact. Photosynthetic pathway NADP-ME bundle sheaths single. Sheaths open ligules usually scarious to membranous, ciliate or not blades mostly well-developed, leaves subtending an inflorescence or an inflorescence unit often with reduced blades. Culms 7-600 cm, annual, not woody, often reddish or purple, particularly at the nodes, often branched above the base.
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