Description from Flora of China
Hypericum breviflorum Wallich ex Dyer in J. D. Hooker, Fl. Brit. India 1: 257. 1874.
Herbs, (15-)30-55 cm tall, ascending from creeping and rooting base; stems solitary or few, unbranched or branched above middle, branches all fertile. Stems 4-lined and ancipitous when young, soon terete, eglandular. Leaves sessile or petiolate to 2 mm; blade narrowly elliptic to oblong, 2-5.5(-7) × 0.6-1.3(-1.5) cm; thickly papery, abaxially paler; laminar glands scattered dots; intramarginal glands ± dense; main lateral veins 5- or 6-paired, forming prominent intramarginal vein, tertiary reticulation lax; base angustate, margin recurved, apex obtuse to rounded. Inflorescence 3-flowered, terminal and with paired 1-3-flowered branches from up to 8 nodes, the whole narrowly cylindric to spiciform; bracts and bracteoles ovate to triangular-ovate; peduncles 0.5-6 mm. Pedicels 1-2 mm. Flowers 5-6 mm in diam., ?funnel-shaped; buds ovoid, apex acute. Sepals erect, ovate to oblong, 3.5-5 × 1.5-2 mm; laminar glands 5, lines; marginal glands absent; margin entire, apex obtuse to rounded, 7-veined. Petals white, obovate-oblong to oblong, 4-6 × 2-3 mm, ca. 1.1 × as long as sepals; laminar glands scattered dots; marginal glands absent; margin entire. Stamen fascicles 3, 2-4 mm, ca. 0.7 × as long as petals; filaments 0.35 to 0.7 united. Fasciclodes ?orange, scalelike, subrectangular, 1-1.5 × ca. 0.8 mm, emarginate. Ovary ovoid to ellipsoid, 2.5-3 × 1.5-2 mm; styles ca. 1 mm, ca. 2/5 as long as ovary, appressed, distally spreading. Capsule ovoid, 6-8 × 3-4 mm, apex acute. Seeds dark red-brown, ca. 1 mm; testa finely foveolate. Fl. Jul-Aug, fr. Aug-Sep.
Wet grasslands, ditches, rice fields, roadsides; below 600 m. Anhui (Jiuhua Shan), Hubei (Qichun), Hunan (Wugang), Jiangsu (Lianyungang), Jiangxi, Taiwan (Nantou), Yunnan (Jinghong), Zhejiang [NE India (Khasia Hills)].