小花山桃草（学名：Gaura parviflora）为柳叶菜科山桃草属下的一个种。

• 小花山桃草 Gaura parviflora. 中国植物物种信息数据库. [2013-01-15]. 

Gaura parviflora (syn. G. mollis James; velvetweed, velvety gaura, downy gaura, or smallflower gaura) is a species of Gaura native to the central United States and northern Mexico, from Nebraska and Wyoming south to Durango and Nuevo Leon.

It is an annual plant growing to 0.2–2 m (rarely 3 m) tall, unbranched, or if branched, only below the flower spikes. The leaves are 2–20 centimetres (0.79–7.87 in) long, lance-shaped, and are covered with soft hair. The flower spikes are 20–30 centimetres (7.9–11.8 in) long, covered with green flower buds, which open at night or before dawn with small flowers 5 millimetres (0.20 in) diameter with four pink petals.