文档介绍：Flora of China 22: 631–633. 2006. 212. HYPARRHENIA Andersson ex Fournier, Me xic. Pl. 2: 51, 67. 1886. 苞茅属 bao mao shu Chen Shouliang ( 陈守良); Sylvia M. Phillips Perennial, infrequently annual. Culms usually tufted, often tall and robust. Leaf blades not aromatic, linear, midvein distinct , apex acuminate; ligule scarious. Inflorescence pound spathate panicle, each ultimate spatheole subtending a peduncle beari ng a pair of short racemes; spatheoles linear to ovate, often brightly colored; peduncle shorter or longer than spatheole, often bea rded; raceme pairs 2- to many-awned, often reflexed at maturity. Each raceme of a pair supported on a short stalk (“raceme base”) ari sing from the peduncle apex (termed “upper” and “lower” raceme base), these subequal or the upper longer, terete or flattened. Racem es with 0–2 pairs of homogamous spikelets below the fertile pairs, these resembling the pedicelled spikelets; pedicels and interno des slender. Sessile spikelet pressed or subterete; ca llus obtuse to pungent, bearded, its apex exposed; lower glume la n- ceolate to linear, leathery, convex, glabrous to villous, flanks rounded, incurving, keeled only near apex; upper glume boat-sh aped, 3- veined, awnless; lower floret reduced to a hyaline lemma; upper lemma stipiform, 2-t oothed, awned between the teeth; awn genic- ulate with hairy column. Pedicelled spikelet male or barren, na rrowly lanceolate, slightly longer than the sessile, acute to ar istulate. Sixty-four species: mainly in Africa, a few species ex tending to other tropical regions ; five species in China. As a genus Hyparrhenia is easy to recognize, with its short, paired racemes grouped in a spathate pani cle, exposed callus tip below the sessile spikelet, and hairy awns. Identification of the species depends on a careful in spection of the details of the pairs of racemes (“raceme pairs”). Homo- gamous spikelets are pairs of male or barr en spikelets, genera lly resembling the ped