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Spikelets laterally compressed, florets several, all bisexual or lowest sterile and without a palea; rachilla glabrous, disarticulating above glumes and sterile floret and between fertile florets; glumes lanceolate, shorter than lemmas, subequal or unequal, scarious-membranous, 1–3-veined, obtuse to acuminate or aristulate; lemmas ovate-lanceolate, scarious-membranous, 3-veined, long-ciliate on lateral veins, keeled, apex setaceously bidentate with a short, often recurved awn from the sinus; palea shorter than lemma, hyaline, keels very shortly ciliate.
小穗侧面压扁,小花数个,全部不育和没有一内稃的最低的两性的或;高于颖片和不结果的小花无毛,脱节的小穗轴和在肥沃的小花之间;披针形的颖片,短于外稃,近等长或不等长,干膜质膜质,1-3脉,具小芒的钝到渐尖或;卵状披针形,干膜质的外稃膜质,3脉,具长缘毛在侧脉上,龙骨状,先端setaceously具双齿具短,通常下弯从那里那些凹缺;内稃短于外稃,透明,龙骨非常短的纤毛。
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tornaria:柱头幼虫
柱头虫的卵小,卵黄含量也少,受精卵为均等全裂,胚体先发育成柱头幼虫(tornaria),然后经变态为柱头虫. 柱头幼虫体小而透明,体表布有粗细不等的纤毛带,营自由游泳生活,它们不论在形态或生活习性方面均酷似棘皮动物海参的短腕幼虫(bipinnaria)(图13-6).