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单枝灯心草Juncus potaninii Buchen.

单枝灯心草Juncus potaninii Buchen.

别名:单枝灯芯草;

科名:灯心草科 Juncaceae

属名:灯心草属 Juncus

《中国植物志》第13(3)卷206页
  50.单枝灯心草(中国高等植物图鉴)图版49:9-11
  Juncus potaninii Buchen. in Bot. Jahrb. 12: 394. 1890; N. E. Brown in Journ. Linn. Soc. Bot. 36: 165. 1903; Walker in Contr. U. S. Nat. Herb. 28: 602. 1941; 中国高等植物图鉴5: 414. 图. 7658. 1976. ——J. luzuliformis Franch. var. potaninii Buchen. in Bot. Jahrb. 36 (Beibl. 82) : 15. 1905 et in Engl., Pflanzenr. 25 (IV. 36): 228. 1906; 秦岭植物志1 (1) : 312. 图. 286. 1976.
  多年生草本,高6-15厘米,具细密稍短的须根。茎丛生,直立或斜上,纤细,直径约0.3毫米,绿色。叶基生和茎生;低出叶鞘状或鳞片状,褐色;茎生叶常2枚,下方1枚较长;叶片丝状,长5-11厘米,宽0.3-0.5毫米,上方的较短,长约2厘米,较窄;叶鞘紧密抱茎;叶耳短,钝圆。头状花序单生于茎顶,常具2花(稀为1花);苞片2-3枚,宽卵形,膜质,顶端尖,下面2片基部稍合生;花被片披针形,长约4毫米,顶端稍尖,内轮者稍长于外轮,白色或淡黄色,有时外轮变为淡褐色;雄蕊6枚,与花被片近等长或稍长;花药线状长圆形,长约1毫米,黄色;花丝丝状,长为花药的2.53倍;花柱长约1毫米;柱头3分叉,裂片扁而厚且反卷。蒴果卵状长圆形,稍长于花被,顶端具短尖头,1室,成熟时暗褐色。种子卵形,长约0.5毫米,黄褐色,表面具纵纹,连同白色附属物共长约0.8毫米。花期6-8月,果期7-9月。
  产陕西、宁夏、甘肃、湖北、四川、贵州、西藏。生于海拔2 300-3 900米的山坡林下阴湿地或岩石裂缝中。模式标本采自甘肃。

《Flora of China》 Vol. 24 (2000)
Juncus potaninii  Buchenau
单枝灯心草   dan zhi deng xin cao
Juncus luzuliformis Franchet var. potaninii (Buchenau) Buchenau.
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.
* Moist places on forested slopes, alpine meadows, streamsides, rock crevices, roadsides; 2300--4200 m. Gansu, Guizhou, Henan, Hubei, Ningxia, Qinghai, Shaanxi, Sichuan, Xizang, Yunnan.

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