Hypericum gramineum, commonly known as small St. John's wort or grassy St. Johnswort, is species of flowering plant in the St. Johns wort family Hypericaceae.

It is found in parts of Southeast Asia, Oceania, and the Pacific.

[2][3] Grassy St. Johnswort is a small annual or perennial herb with a height of 5–72 cm (2.0–28.3 in).

[5] Hypericum gramineum occurs in New Zealand, Australia, New Caledonia, Papua-New Guinea, Vietnam, Taiwan, China (Hainan, Yunnan), India (Meghalaya, Manipur), Bhutan, and the United States (Hawaii).

[2] It grows in open grassy and shrubby habitats.