Juncus sphacelatus Decaisne

A very variable species in arrangement of floral heads, flower size, and shape of capsules. It is not possible to separate Juncus himalensis Klotzsch from this species specifically, and it is reduced here to a varietal rank.

Erect perennial, stoloniferous and with creeping rootstock, tufted, 20-40 (-45) cm tall; stem fistular, terete, with basal leaves and 1-2 cauline leaves. Leaves usually not exceeding the stem, subrigid, setaceous-canaliculate, 1.5-2 mm broad, ± green, usually long-acuminate; sheaths brownish, with short rounded auricles. Inflorescence of 2-5, seemingly superposed to subcorymbosely congested heads, each usually with 3 or 6 flowers, brown; lowest bract equalling to exceeding the heads. Flowers (5-) 6-8 mm long, shortly pediceled or subsessile; perianth segments lanceolate, subequal, inner slightly longer, sub-obtuse, outer acute, brownish. Stamens slightly shorter than perianth; anthers c. as long as the filaments. Capsules 5-9 x 2-2.5 mm, oblong-ovate, conic above, with a beak upto 2 mm long, dark reddish-brown, many seeded; seeds c. 4 mm long, including long whitish tails at the ends.

Plants perennial, 17--55 cm tall. Rhizome 1.5--3 mm in diam. Stems terete, 2--3.5 mm in diam. Cataphylls few. Basal leaves 5 or 6; leaf sheath auricles obtuse, membranous, free part ca. 3 mm; leaf blade linear-lanceolate, semiterete, 4--14 cm × 3--5 mm, apex obtuse. Inflorescences terminal, usually 2- or 3-branched; involucral bract linear-lanceolate, 5--15 cm, equaling inflorescence; heads 2--5(--8), subglobose to hemispheric, 1.2--2 cm in diam. in fruit, 5--7-flowered. Pedicels 2--3(--5) mm. Perianth segments chestnut brown to blackish brown, lanceolate, veins 1--3, apex acute; outer segments 6.5--11 mm; inner segments 6.3--9.7 mm. Stamens 6; filaments chestnut brown at base, 2--4 mm, apex whitish hyaline; anthers 2--2.5 mm. Style 1.5--2 mm; stigmas 2--3 mm. Capsule chestnut brown, shiny, trigonous oblong, 6--8 mm, 3-septate, apex obtuse, beaked; beak ca. 1 mm. Seeds ellipsoid, 0.7--0.9 mm, both ends appendaged; appendages white, 1.2--1.5 mm. Fl. Jul--Aug, fr. Aug--Sep.

Afghanistan, Himalaya (Kashmir to Bhutan), W. China.

Qinghai, Sichuan, Xizang, Yunnan [Afghanistan, Bhutan, India, Kashmir, Nepal, Sikkim].

4100-5200 m

Wet places at ravine margins and riversides, moist streamsides, grasslands on mountain slopes; 3300--4800 m.

Juncus sphacelatus là một loài thực vật có hoa trong họ Juncaceae. Loài này được Decne. mô tả khoa học đầu tiên năm 1844.

枯灯芯草（学名：Juncus sphacelatus）为灯心草科灯心草属的植物。分布于印度、阿富汗、尼泊尔、克什米尔地区以及中国大陆的西藏、云南、四川等地，生长于海拔3,300米至4,800米的地区，一般生于沟旁、山坡和河边湿地，目前尚未由人工引种栽培。