Abstract: The structures of papilla of lemma in 21 species of Oryza and 2 species of Leersia were observed by scanning electron microscopy. The structures were classified into 6 kinds including bi-peaked tubercle, multi-peaks tubercle, warty peaked tubercle, four peak tubercle, trace tubercle, and inlaid-silica-peak tubercle according to morphological structures of papilla. The bi-peaked tubercle includes acute type and obtuse type by means of bi-peaked distance (BPD), col distance(CD), ratio of BPD/CD and peaked angle(PA). The relationship between the structures of papilla and classification of Oryzaand Leersia and lemma hairs are discussed.

Key words: Oryza, Leersia, lemma, papilla structure

摘要： 用扫描电镜对稻属植物21个种和假稻属植物2个种的外稃表面乳突作了观察。根据乳突的形态特征，将乳突分为6类，即双峰乳突、多向双峰乳突、瘤峰乳突、四峰乳突、凹痕乳突和假稻属的嵌硅双峰乳突。根据双峰距、垭深、距/深比和峰角度等性状，将双峰乳突分为锐型和钝型的两种类型。对乳突特征与稻种分类的关系以及稃毛的变态问题进行了讨论。

关键词: 稻属, 假稻属, 外稃, 乳突结构