对中国干旱区柽柳科(Tamaricaceae)植物 3 属 7 代表种的种子形态及种皮表面亚显微结构进行了观察, 表明种子形态及种皮表面亚显微结构可为本科植物的分类提供有价值的信息。 根据种子表皮毛着生的类型并结合外部形态特征可初步得出以下结论:(1)表皮毛可分为 Ⅰ 型表皮毛和Ⅱ型表皮毛, 前者着生于种子表面, 包括红砂属(Reaumuria L .)和柽柳属(Tamarix L.)植物的一些种类;后者着生于种子顶端的芒柱上, 包括柽柳属一些种类和水柏枝属(Myricaria Desv.)植物。(2)表皮毛的演化趋势是由 Ⅰ 型表皮毛向Ⅱ 型表皮毛转化。(3)红砂属处于本科的原始地位, 水柏枝属较为进化, 柽柳属是联系两者的中间环节, 本属内亦存在许多过渡类型。

The seed coat submicroscopic structures of 7 species in 3 genera of Tamaricaceae from China arid areas are observed .The results showed that the seed morphology and the feature of seed coat could provide characteristic significance to the taxonomy of the family .Seeds of all genera of Tamaricaceae possess epiderm al hairs , which may will be related to water absorption and dispersion .According to the seed epidermal hair position on seed , the autho rs considered that :(1)Seed epidermal hairs can be divided into two types :type Ⅰ and type Ⅱ.The former type, which includes Reaumuria L .and some species of Tamarix L ., the hairs g row on the seed surface ;the latter type , including some species of Tamarix and Myricaria Desv ., the hairs only grow on the aw n at seed apex .(2)A trend towards the growth position of hairs can be postulated as a transition from type Ⅰ to type Ⅱ.(3)Reaumuria has a more ancestral position within the family , Tamarix and Myricaria are more advanced in their evolutionary process , while
Tamarix as a transitional group links the other two genera .