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Inflorescences

Dissections:
Schizachyrium scoparium

Line drawings

SCHIZACHYRIUM Nees. Bluestem
Plants hermaphroditic, caespitose or rhizomatous or stoloniferous, annual or perennial (our species). Culms erect or ascending or decumbent; internodes solid or hollow, glabrous or glaucous or hairy, terete; nodes glabrous or glaucous. 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 infated or spathe-like (rarely resembling a spathe); not aromatic; rachis glabrous or pubescent or hirsute; pedicels not longtudinally grooved, glabrous or hairy, semiterete. Spikelets paired at inflorescence nodes (at apex ternate), similar or dissimilar in size and shape, disarticulation below the glumes, dorsiventrally compressed; sessile (or short pediceled) spikelets fertile, pedicellate (or long pediceled) spikelets sterile or staminate or neuter and reduced. Pedicellate spikelets usually reduced, awned or awnless. Sessile spikelets perfect; first glumes 2-keeled, not with a gland-like depressions or pits; abaxial surface convex, smooth, indurate, glabrous or hairy, awnless; second glumes length equal to first glumes; lower florets sterile; lemmas hyaline, entire (acute), awnless; paleas absent; upper florets fertile; lemmas hyaline, 1/4 to 7/8 bifid, awned from between the teeth of lemma; paleas usually absent or rarely present, hyaline when present. Stamens 1 or 2 or 3; anthers golden or purple. Caryopses dorsiventrally compressed, linear. Base chromosome number x=10.

A genus of about 60 species. This genus occurs in temperate, subtropical or tropical habitats on mesic toxeric sites. These are important livestock forages and ecological dominats.