十字花科四属植物叶片脉序的比较研究

Comparative Observation on Venation about Four Genera in Cruciferae

摘要: 对十字花科有争议的岩荠属Cochlearia、泡果荠属Hilliella、阴山荠属Yinshania、棒毛荠属Cochleariella植物的叶片脉序进行了研究.结果表明:岩荠属为环结曲行羽状脉,泡果荠属为直行羽状脉,阴山荠属为半直行羽状脉,棒毛荠属种的叶脉与浙江泡果荠相似.前3属植物在网眼的大小、叶缘末级脉和叶先端的形态上也存在着差异.据此作者认为岩荠属、泡果荠属和阴山荠属这3属植物分开是合理的.但棒毛荠属的分类地位值得进一步研究.还得出这几个属的叶脉演化关系是:基出完全掌状脉→环结曲行羽状脉→直行羽状脉.

Abstract: The comparative observation on leaf venation in 16 species belong to Cochlearia,Yinshania,Hilliella and Cochleariella were conducted.The rusult shows:Venation of Cochlearia is Brochidodromous;Hilliella is Craspedodromous,Yinshania is Half-Craspedodromous and Cochleariella is similar to H. warburgii.The fomer three genera have differences in size of areole,marginal ultimate venation and shape of apex.It is reasonable for the fomer three genera to exist.The taxonomy position of Cochleariella is merit study further.The evolution relationship of venation for these genera is Basal Perfect Actinodromous→Brochidodromous→Craspedodromous.