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Inflorescences

Dissections:
Hemarthria altissima

HEMARTHRIA R.Br.
Plants hermaphroditic, caespitose, perennial. Culms erect or ascending or decumbent; internodes hollow, glabrous, terete; nodes glabrous. Leaves basal and cauline, not distinctly distichous; sheaths terete or with compressed keels, margins open; auricles absent; ligules a ciliate membrane; blades flat or folded, linear, lax, apex acuminate. Spicate racemes terminal and axillary (several inflorescences per culm), sheaths subtending inflorescences not spathe-like; not aromatic; rachis glabrous; pedicels not with a longitudinal groove, glabrous. Spikelets paired or ternate at each inflorescence node; dissimilar in size and shape, disarticulation below the glumes, dorsiventrally compressed, sessile (or short pediceled) spikelets fertile, pedicellate (or long pediceled) spikelets reduced or staminate or neuter. Pedicellate spikelets reduced or staminate or neuter, awnless. Sessile spikelets perfect; first glumes 2-keeled, gland-like depressions or pits absent; abaxial surface convex, smooth, coriaceous, glabrous, awnless; second glumes length equal to the first glumes; lower floret sterile; lemmas hyaline, apex entire, acute, awnless; paleas present (short), hyaline; upper florets perfect, lemmas hyaline, apex entire (acute), awnless; paleas present (short), hyaline. Stamens 3; anthers brown. Caryopses broadly lanceolate, dorsiventrally compressed, brown. Base chromosome number x=9.

A small genus of about 12 species native to the tropical and subtropical regions of the Old World. Commonly adapted to disturbed open habitats. Frequently in wet or moist sites.