翼茎草属（学名：Pterocaulon）是菊科下的一个属，为草本或亚灌木植物。该属共有25种，分布于美洲、大洋洲、亚洲和非洲南部。

Pterocaulon is a genus of flowering plants in the sunflower family, native to North and South America and to Australasia. Blackroot is a common name for species native to North America.

The plants are perennial herbs, frequently densely covered with woolly hairs. The generic name means "winged stem," referring to the decurrent leaf bases that give the appearance of wings running down the sides of the stems.