Juncus concinnus var. gracilicaulis (A. Camus) R. C. Srivastava

Plants perennial, 10--30 cm tall. Rhizome short. Stems 0.6--1 mm in diam. Cataphylls few, chestnut brown. Basal leaves 1 or 2, cauline leaf 1; leaf sheath auricles well developed; leaf blade linear-lanceolate, flat, 5--30 cm × 1--4 mm, veins numerous, apex acuminate. Inflorescences with involucral bract leaflike, 3--15 cm, longer than inflorescence; heads 3 or 4, subglobose to hemispheric, 5--10 mm in diam., 3--7-flowered. Perianth segments lanceolate, apex acute; outer segments 2.8--3.5 mm; inner segments 3--4.5 mm. Stamens 6; filaments 6--7 mm; anthers 1.5--1.8 mm. Style 1.5--2 mm; stigmas 1--1.5 mm. Capsule yellowish, somewhat shiny, inconspicuously trigonous ellipsoid, 3.5--5 mm, 1-loculed. Seeds brown, ovoid, 0.7--0.9 mm, both ends appendaged; appendages caudate, 0.2--0.5 mm. Fl. Jun--Jul, fr. Aug--Sep.

Sichuan, Yunnan [Bhutan, Sikkim].

Rocks in forests, streamsides, mountain summits, cut-over areas; 2700--3600 m.

Juncus concinnus D. Don var. gracilicaulis (A. Camus) R. C. Srivastava.

Juncus gracilicaulis là một loài thực vật có hoa trong họ Juncaceae. Loài này được A.Camus mô tả khoa học đầu tiên năm 1910.

细茎灯心草（学名：Juncus gracilicaulis）为灯心草科灯心草属的植物，为中国的特有植物。分布于中国大陆的云南、四川等地，生长于海拔2,700米至3,600米的地区，多生长在溪边、采伐迹地、山顶或山坡林下岩石上，目前尚未由人工引种栽培。