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中越边境喀斯特地区是全球生物多样性热点地区,也是生物多样性保护的关键区域,近年来在该地区发现了多个蛛毛苣苔属植物的新种.微花蛛毛苣苔于2001年在越南北部喀斯特地区首次采集到标本,直到2018年才被发表出来,由于发表时仅基于一号花发育未成熟的标本,所以该物种的诸多形态特征仍不清楚.作者开展中越边境喀斯特地区植物多样性调查时,在我国云南东南部发现了微花蛛毛苣苔,并采集到花发育成熟的植株,对其进行了解剖观察和测量,现对该物种进行补充描述,并提供墨线图和野外生态照片以资辨认.微花蛛毛苣苔与腺花蛛毛苣苔在光滑无毛而反折的花萼以及被腺毛的花冠等形态上最相似,但不同之处在于微花蛛毛苣苔的叶上面幼时被褐色蛛丝状绵毛,后变近无毛,花序顶生,花冠长9～12 mm,蒴果直,不旋扭,长1.2～2.8 cm.微花蛛毛苣苔在滇东南的发现,说明中国南部喀斯特地区和越南北部喀斯特地区构成了一个完整的植物区系地理单元.“,”Sino-Vietnamese limestone karsts are biodiversity hotspots in the world and key areas for biodiversity conser-vation, and many new species of Paraboea have been found there recently. Paraboea minutiflora D. J. Middleton was col-lected firstly from northern Vietnam in 2001 and was published in 2018, but it is incomplete and lacks type specimens with mature flowers when reported. The description of Paraboea minutiflora was supplemented based on the collectionsfrom southeastern Yunnan, China and Ha Giang, Vietnam, and line drawing and photos are also provided. Paraboea minutiflora is most similar to Paraboea glanduliflora Barnett in having glabrous, reflexed calyx and corolla with glandular hairs, but differs from the latter by the upper leaf surfaces covered with brown matted indumentum when young, but gla-brescent at maturity, the inflorescences terminal, the corolla 9-12 mm long, the capsule straight, 1. 2 – 2. 8 cm long. The discovery of Paraboea minutiflora from southeastern Yunnan, China demonstrates the flora is closely interrelat-ed between the southern limestone karsts of China and the northern limestone karsts of Vietnam.