Spikelets with 1 floret (very rarely 2), rachilla disarticulating above glumes, with penicillate extension lying against the palea; glumes subequal, usually slightly longer than the floret, rarely slightly shorter, membranous, 1–3-veined, apex acute or acuminate; floret callus bearded, hairs usually 1/3 as long up to about equaling floret; lemma thinly to firmly membranous,(3–)5-veined, dorsally awned or awnless, apex erose, denticulate or 2–4-toothed; awn geniculate or straight, its position varying from near base to near apex, usually inconspicuous, up to twice length of lemma but occasionally reduced to a subapical mucro or absent; palea 2/3 as long to subequaling lemma.

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Cystoliths dotlike or very short blunt rods; stigma often on a style, mostly linear, less often penicillate-capitate; perianth lobes of female flowers usually connate into a tube, rarely strongly reduced, or absent, staminodes absent.

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Stipules interpetiolar; achene straight, sessile; stigma penicillate-capitate; slender herb to 40 cm.

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Ovary rudimentary in male flowers, sessile or shortly stipitate, free or adnate to the perianth; 1-locular, ovule solitary, erect from the base; style simple, or absent; stigma diverse, capitate, penicillate-capitate, subulate, filiform, ligulate, or peltate.

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Racemes axillary, extra-axillary, or opposite to leaf; lateral petals equaling or shorter than carina; style apex not penicillate; capsule orbicular or obcordate; seeds pubescent

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Ovary straight; style absent; stigma penicillate, deciduous; ovule orthotropous.

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Ovary straight, ellipsoid; style absent; stigma penicillate; ovule orthotropous.

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Staminodes 3 or rarely absent, alternate with petals, often clawed, 2-cleft or 2-brachiate and branches with penicillate hairs.

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Petals white; filaments glabrous, connectives broad, square, deltoid, oblong, rarely narrow; stigma mostly penicillate

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Spikelets with 1 floret; rachilla disarticulating above glumes, extension beyond floret absent or small and glabrous, rarely better developed and penicillate; glumes persistent, subequal or unequal with lower longer, narrowly lanceolate, much exceeding floret, lower glume 1-veined, upper glume 3-veined at base, apex finely acuminate or subulate; floret callus conspicuously bearded, hairs much exceeding floret; lemma ca. 1/2 as long as glumes, hyaline, 3–5-veined, awned, apex erose, denticulate or deeply 2-lobed; awn very slender, straight or almost so, arising from lemma back, apex or between teeth; palea 1/2 as long to slightly shorter than lemma.

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