中文摘要：

该文报道了西藏地区紫草科1新记录属微果草属（Microcaryum）及1新记录种微果草（Microcaryum pygmaeum（Clarke）Johnst.）。该种发现于西藏隆子县,生于海拔约5 000m的高山草甸。研究了其外部形态、小坚果微形态及花粉形态,并与形态相近种毛果草（Lasiocaryum densiflorum（Duthie）Johnst.）进行了比较。凭证标本保存于北京师范大学动植物标本馆植物标本室（BNU）。

英文摘要：

The paper reports a new record genus of Boraginaceae,Microcaryum,and a new record species,Microcaryum pygmaeum（Clarke）Johnst.,in Xizang.M.pygmaeum growing in the altitude of 5 000 m,was found in the alpine meadow of Longzi Xizang.The characteristics of its external morphology,nutlet and pollen epidermal micromorphology were studied in detail,and the differences between it and the related species Lasiocaryum densiflorum（Duthie）Johnst.were presented in the paper.The voucher specimen is deposited in the herbarium of Beijing Normal University（BNU）.