Poaceae

Pooideae

Chloridoideae

Panicoideae
Andropogoneae
Andropogon
Arthraxon
Bothriochloa
Chrysopogon
Dichanthium
Elionurus
Eremochloa
Hemarthria
Heteropogon
Imperata
Microstegium
Mnesithea
Rottboellia
Saccharum
Schizachyrium
Sorghastrum
Sorghum
Themeda
Trachypogon
Tripsacum
Zea
Paniceae

Arundinoideae

Bambusoideae

Home

Inflorescences

Dissections:
Heteropogon contortus

HETEROPOGON Pers.
Plants hermaphroditic, caespitose, annual or perennial. Culms erect or ascending; internodes solid, glabrous, slightly flattened; nodes glabrous. Leaves basal and cauline, not distinctly distichous; sheaths with compressed keels, margins open; auricles absent; ligules a ciliate membrane; blades flat or folded, linear, lax, apex obtuse to acute. Spicate racemes terminal (occasionally axillary inflorescences per culm), not aromatic; rachis hairy; pedicels not having a longitudinal groove, hairy, semi-terete. Spikelets paired at each inflorescence node, dissimilar is size and shape, (pedicellate spikelets larger), disarticulation below the glumes, dorsiventrally compressed, sessile (or short pediceled) spikelets fertile, pedicellate (or long pediceled) spikelets staminate or neuter. Pedicellate spikelets well developed but usually staminate, awnless. Sessile spikelets perfect; first glumes 0-keeled, gland-like depressions or pits not present; abaxial surface convex, smooth, coriaceous, hairy, awnless; second glumes length equal to the first glumes; lower floret sterile; lemmas hyaline (3-veined), entire, awnless; paleas absent; upper florets perfect, lemmas (3-veined) cartilaginous below, entire, awned from apex, awns 1-geniculate and dark brown; paleas present, or absent, (reduced when present). Stamens 0 or 1 or 2 or 3; anthers brown. Caryopses dorsiventrally compressed, longitudinally grooved. Base chromosome number x=10.

A genus of about seven species that occur in tropical and subtropical regions of the world. Tanglehead (H. contortus) has a worldwide distribution and is a important forage in the southwestern United States.