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Inflorescences

Dissections:
Rottboellia cochinensis

ROTTBOELLIA L.f.
Plants hermaphroditic, caespitose, annual. Culms erect or ascending; internodes solid, glabrous or scabrous, terete; nodes glabrous. Leaves mostly cauline, not distinctly distichous; sheaths terete (lower sharply hispid), margins open; auricles absent; ligules a ciliate membrane; blades flat or involute, linear, lax, apex acuminate. Spicate racemes terminal and axillary (several inflorescences per culm), sheaths subtending inflorescences not inflated or spathe-like; rachis glabrous; pedicels not longitudinally grooved, glabrous, cross-section thin and concave. Spikelets paired (except at the inflorescence apex), sessile (or short pediceled) spikelets fertile; pedicellate (or long pediceled) spikelets reduced, staminate or sterile. Pedicellate spikelets reduced, awnless. Sessile spikelets perfect; first glumes 2-keeled, without gland-like depressions or pits, coriaceous; abaxial surface flat or convex, glabrous, awnless; second glumes length equal to first glumes; lower floret staminate; lemmas hyaline, entire, awnless; paleas present (well developed) hyaline; upper florets perfect; lemmas hyaline, entire, awnless; paleas present, hyaline. Stamens 3; anthers yellow. Caryopses small, obovate, dorsiventrally compressed, yellow. The base chromosome number x=9 or 10.

A small genus of about four species from tropical and subtropical Africa. Our species is an important noxious weed. The species can become weeds in cultivated crops.