薄柱草属（学名：Nertera）是茜草科下的一个属，为纤弱草本植物。该属共有约17种，分布于马来西亚、大洋洲和南美。

Nertera is a genus of about 15 species of flowering plants in the family Rubiaceae, native to the Southern Hemisphere, in South America and Australasia, with one species extending into the Northern Hemisphere in Central America, eastern Asia, and Hawaii. The name derives from the Greek word nerteros, meaning low down. Common names include pincushion, coral bead or bead plant. They are prostrate, creeping, mat-forming herbaceous perennial plants growing to 20–40 cm (7.9–15.7 in) across or more but no more than a few centimetres high. The leaves are usually quite small, and when crushed may in some species release a foul smell (methanethiol) like the related woody genus Coprosma. The flowers are insignificant and probably wind-pollinated. The fruit is usually a bright orange berry, but in some species may be a dry capsule.