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Inflorescences

Dissection of
Trachypogon secundus

TRACHYPOGON Nees
Plants hermaphroditic, caespitose, perennial. Culms erect or ascending; internodes solid, glabrous, terete; nodes densely pubescent or bearded (glabrate with age). Leaves basal and cauline, not distinctly distichous; sheaths terete, margins open; auricles absent; ligules membranous; blades flat or involute, linear, lax, apex acuminate. Spicate racemes terminal (rarely a few inflorescences per culm), sheaths subtending inflorescences not spathe-like; not aromatic; rachis hairy; pedicels not with a longitudinal groove, semi-terete. Spikelets paired or ternate at each inflorescence node; dissimilar in size and shape, disarticulation at base of long pediceled spikelet, laterally compressed or terete, sessile (or short pediceled) spikelets staminate or neuter, pedicellate (or long pediceled) spikelets perfect. Sessile spikelets sterile; dorsally flattened. Pedicellate spikelets perfect; first glumes 2-keeled, gland-like depressions or pits not present; abaxial surface flat, smooth, chartaceous, glabrous, awnless; second glumes length equal to first glumes; lower floret sterile; lemmas hyaline, entire, awnless; paleas absent; upper florets perfect; lemmas (hairy) hyaline, entire, awned; awns apical and long plumose; paleas present or absent, reduced when present and hyaline. Stamens 3; anthers golden yellow. Caryopses laterally compressed. Base chromosome number x=7.

A small genus of about 12 species found in the Africa and North and South America. The grasses are usually from mesic, open habitats.