Hackelochloa 亥氏草屬
型態特徵
Annuals; culms solid, glabrous or with sparse, long, sharp, tubercle-based hairs. Ligule short, ciliate; blades linear or linear-lanceolate, with long tubercle-based hairs beneath or on both sides; inflorescence a pedunculate raceme. Spikelets small, in alternating pairs along rachis of small, spike-like, pedunculate racemes, subtended by a spathe-like leaf, pairs of spikelets dorsiventrally arranged, uppermost joint of raceme with 1 sessile and 2 pedicellate spikelets; pedicels totally fused with adjacent joint of rachis, together forming a cavity. Sessile spikelets globose or elliptic, with swollen, smooth or finely tuberculate, glabrous base, muticuous; lower glume abaxial, globose-convex, prominently tessellateribbed, finely tuberculate, hard, with margins pressed against rachis, blackish brown at maturity, upper glume shorter and narrower, convex, sunken into a cavity of and partially fused with rachis, elliptic, rather hard, 1-nerved, x keel thickened at apex; lower lemma rather strongly convex, 3-nerved, marginal nerves easily separating from central part, glabrous; lower palea wanting; upper lemma and palea smaller, hyaline, oval, obtuse, nerveless; lodicules 2, cuneate; stamens 3, anthers small, with 2-fid base and apex; styles 2, rather short, stigmas short, apically exserted together with stamens. Caryopsis broadly elliptic. Pedicelate spikelets strikingly different from sessile, ovate, flat or faintly convex, not blackish brown at maturity, upper ones often reduced; lower glume as long as spikelet, ovate, rather acute, with flat or faintly convex dorsally, finely tuerculate, nerves 4-6, marginal nerves prominent; upper glume equally long, strongly obtuse, thin, glabrous, 2-nerved; upper lemma and palea ovate, acutish, nerveless. Lemmas, upper palea and stamens of neuter spikelets all or partly abortive.
One or two species in the tropics regions worldwide; one species is found in Taiwan.
