中国番荔枝科囊瓣木族植物叶片脉序比较观察

COMPARATIVE ANATOMICAL OBSERVATION ON VENATION OF THE TRIBE SACCOPETALEAE (ANNONACEAE) IN CHINA

中路番荔枝科囊辦木族植物共有5属10种,其中有囊辦木属Saccopetalum Benn.,野独活屈Miliusa Lesch.ex A.DC.,蚁花届Mezzettiopsis Ridl.,澄广花属Orophea B1.等属的分类位置仍存在着一些争议。本文对它们有争议的4个屈进行了叶片脉序比较观察,提供分类一个辅佐证据。

There are 5 genera and 10 species belonging to Saccopetaleae (Annonaceae) in China. Their toxonomic positions except for the Phaeanthus Hook. f. et Thomson aroused come argument. We through the oomparative observation of their leaf venational morphology, discovered that the venational characters are obviously distinct anal may contribute as additional evidence for the necessary restitution as well as the identification of individual genera and species. On the basis of the foliar venational characters, the following key to the genera is presented:1. The tertiary veins and minute quaternary veins are brochidodromous, at the margin with a fimbrial vein.2. The tertiary veins smaller, with quaternary veins slightly similar; quaternary veins constitute areole 0.3—0.4 mm with the quinternary veins…ⅰ. Mezzettiopsis Ridl.2. The tertiary veins slightly stout and obviously distinct from the quaternary veins; quaternary ones constitute areole over 0.4 mm with quinternary veins…2. Orophea B1.1. The tertiary veins and minute quaternary veins are brochidodromous, at the margin without a fimbrial vein, but constitute veinlets.3. The secondary veins at lower part arcuate-ascending, shaping with the midrib an angle of 75°—85°…3. Saccopetalum Benn.3. The secondary veins at lower part arcuate-or oblique-ascending, shaping with the midrib an angle of 30°—45°…4. Miliusa Lesch. ex A. DC.