《中国植物志》|| 灯心草科 JUNCACEAE ||东川系 Ser. Dongchuanenses K. F. Wu ||东川灯心草 Juncus dongchuanensis K. F. Wu
38.东川灯心草(植物分类学报)图版40: 6-7
Juncus dongchuanensis K. F. Wu in Act. Phytotax. Sin. 32 (5) : 457. 1994.
多年生草本,高17-24厘米。茎直立,圆柱形,直径1-1.4毫米,具纵条纹。叶基生和茎生;低出叶数枚。长1.5-2.7厘米,顶端有芒尖;基生叶线形,长6-19厘米;茎生叶常1枚;叶片圆柱状,干后稍扁,长9-14厘米,宽1.9-2.5毫米,顶端有胼胝体,具不甚明显的横隔;叶鞘长2.5-3.2厘米,边缘狭膜质;叶耳稍圆或有时不明显。花序由2-7个头状花序组成,排列成聚伞状;头状花序近球形,直径6-13毫米,通常由多数不育花组成,位于聚伞状花序下部的头状花序,其基部具1-3朵能育花;总苞片钻形,长1.1-1.5厘米;苞片数枚,宽卵形或卵状披针形,长2-5.5毫米,宽1-7.5毫米,膜质,淡黄白色,顶端渐尖;花具短梗;花被片膜质,黄白色,外轮3片披针形,长3.9-4.5毫米,宽约1毫米,顶端稍钝,具3脉,内轮者长圆状披针形,长6毫米,宽约1.4毫米;雄蕊6枚;花药线形,长约2毫米,淡黄色;花丝长于内轮花被片;子房长圆形;花柱长2-2.3毫米;柱头3分叉,长约1毫米。蒴果(未完全成熟)三棱状长圆形,长3-3.5毫米,比内轮花被片短,具3隔膜,橙黄色,顶端有宿存花柱。种子未成熟。花期7月,果期8-9月。
产云南。生于海拔2 500-2 700米的路边山坡草丛中。模式标本采自云南东川。
本种与雅灯心草J. concinnus D. Don近缘,但本种叶具横隔膜,茎生叶1枚,头状花序呈球形,多为不育花,仅在聚伞状花序下部的头状花序基部具1-3朵能育花,易于区别。
数据来源 中国植物物种信息数据库 《Flora of China》|| Juncaceae || Juncus ||东川灯心草 Juncus dongchuanensis
35. Juncus dongchuanensis K. F. Wu, Acta Phytotax. Sin. 32: 457. 1994.
东川灯心草 dong chuan deng xin cao
Plants perennial, 17--35 cm tall. Rhizomes clustered, densely branched, short. Stems terete, 1--1.4 mm in diam., striate. Cataphylls few. Basal and cauline leaves 1--3; leaf sheath auricles obtuse, sometimes inconspicuous; leaf blade terete to slightly compressed, 7--18 cm × 2--3 mm, inconspicuously septate, apex with a callus. Inflorescences terminal; involucral bract subulate, 1.1--1.8 cm; heads 2--7, subglobose, 6--13 mm in diam., with sterile flowers except for 1--3 fertile ones at base; bracts yellowish white, broadly ovate to ovate-lanceolate, 2--5.5 × 1--1.5 mm. Pedicels short. Perianth of fertile flowers yellowish white, scarious; outer segments lanceolate, 3.9--4.5 × 1--1.2 mm, veins 3, apex somewhat obtuse; inner segments oblong-lanceolate, 6--6.4 × 1.2--1.4 mm. Stamens 6; filaments ca. 6.5 mm; anthers ca. 2 mm. Style 2--2.3 mm; stigmas ca. 1 mm. Capsule (immature) orange, trigonous oblong, 3--3.5 mm, shorter than inner perianth segments, 3-septate, apex beaked; beak ca. 1 mm. Seeds sterile. Fl. Jul, fr. Aug--Oct.
* Abies forests, trail sides on mountain slopes, grassy meadows, marshy areas; 2500--3500 m. C and W Yunnan.
This species is probably a sterile hybrid involving Juncus concinnus.
数据来源 eFloras.org