According to plants' characters, there are 238 species of xylophyta, 300 species of herb, and 80 species of climbing plant.
按植物性状统计，木本维管束植物有238种，草本植物有300种，藤本植物有80种。
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Aim to find the basis in morphology that herbs have hypericin while xylophyta have not hypericin in Hypericum L., and to provide the basis for developing plant resources in Hypericum.
Results There are secretory nodule and secretory cavity(canal), two secretory structures different in the character of morphology, in herbs, but there is only secretory cavity(canal)in xylophyta.