Juncus potaninii Buch.

Plants perennial, tufted, 6--15 cm tall. Stems erect or obliquely ascending, ca. 0.3 mm in diam. Cataphylls 1--3; basal and cauline leaves 2(--4); leaf sheath auricles obtuse, 0.1--0.3 mm, membranous; leaf blade filiform, proximal one 5--11 cm × 0.3--0.5 mm, distal one 2--3 cm. Inflorescences terminal; head solitary, rarely paired, (1 or)2-flowered; bracts 2 or 3, broadly ovate, ca. 3 mm, apex acute. Perianth segments whitish to yellowish but outer ones brownish with age, lanceolate, 3.8--4 mm, unequal with inner ones slightly longer than outer, apex subacute. Stamens 6, subequaling or slightly longer than perianth; filaments 2.5--3 mm; anthers 0.8--1 mm. Style 0.8--1 mm; stigmas capitate, ca. 0.5 mm. Capsule dark brown at maturity, ovoid-oblong, 3.5--3.7 mm, 1-loculed, apex beaked; beak ca. 0.3 mm. Seeds ovoid, 0.5--0.7 mm; appendages 0.2--0.3 mm, unequal. Fl. Jun--Sep, fr. Jul--Sep.

Gansu, Guizhou, Henan, Hubei, Ningxia, Qinghai, Shaanxi, Sichuan, Xizang, Yunnan.

* Moist places on forested slopes, alpine meadows, streamsides, rock crevices, roadsides; 2300--4200 m.

Juncus luzuliformis Franchet var. potaninii (Buchenau) Buchenau.

Juncus potaninii là một loài thực vật có hoa trong họ Juncaceae. Loài này được Buchenau mô tả khoa học đầu tiên năm 1890.

单枝灯心草（学名：Juncus potaninii）为灯心草科灯心草属的植物，为中国的特有植物。分布于中国大陆的宁夏、贵州、四川、陕西、甘肃、湖北、西藏等地，生长于海拔2,300米至3,900米的地区，多生于山坡林下阴湿地和岩石裂缝中，目前尚未由人工引种栽培。