扁茎灯心草Juncus compressus Jacq.
扁茎灯心草Juncus compressus Jacq.
7.扁茎灯心草（植物分类学报）图版37：5-8
Juncus compressus Jacq. , Enum. Stirp. Vindob. 60 et 235. 1762; Franch. , Pl. David. 1: 311. 1884; Hook. f., Fl. Brit. Ind. 6: 393. 1894; Buchen. in Engl. Pflanzenr. 25 (IV. 36) : 111. 1906: V. Krecz. et Gontsch. in Kom. Fl. URSS. 3: 527. t. 28. fig. 1. 1935; S. Snogerup in Tutin, Fl. Europ. 5: 106. 1980.——J. compressus Jacq. var. gracillimus Buchen. in Engl. Pflanzenr. 25 (IV. 36) : 112. 1906.——J. gracillimus (Buchen.) V. Krecz. et Gontsch. in Kom. Fl. URSS. 3: 528. t. 28. fig. 2. 1935; 秦岭植物志1 (1): 305. 图277. 1976; 中国高等植物图鉴5: 410. 图7650. 1976.
多年生草本，高约（8-）15-40（-70）厘米；根状茎粗壮横走，褐色，具黄褐色须根。茎丛生，直立，圆柱形或稍扁，绿色，直径0.5-1.5毫米。叶基生和茎生；低出叶鞘状，长1.5-3厘米，淡褐色；基生叶2-3枚；叶片线形，长3-15厘米，宽0.5-1毫米；茎生叶1-2枚；叶片线形，扁平，长10-15（-20）厘米；叶鞘长2-9厘米，松弛抱茎；叶耳圆形。顶生复聚伞花序；叶状总苞片通常1枚，线形，常超出花序；从总苞叶腋中发出多个花序分枝，花序分枝纤细，长短不一，长者达4-6厘米，顶端1-2回或多回分枝，有时花序延伸长达13厘米；花单生，彼此分离；小苞片2枚，宽卵形，长约1毫米，顶端钝，膜质；花被片披针形或长圆状披针形，长1.8-2.6毫米，宽0.9-1.1毫米，顶端钝圆，外轮者稍长于内轮，较窄，内轮者具宽膜质边缘，背部淡绿色，顶端和边缘褐色；雄蕊6枚；花药长圆形，基部略成箭形，长0.8-1毫米，黄色；花丝长0.6-0.8毫米；子房长圆形，长约1.5毫米；花柱很短；柱头3分叉，长约1.5毫米。蒴果卵球形，长约2.5毫米，超出花被，上端钝，具短尖头，有3个隔膜，成熟时褐色、光亮。种子斜卵形，长约0.4毫米，表面具纵纹，成熟时褐色。花期5-7月，果期6-8月。
产东北、华北、西北、山东及长江流域诸省区。生于海拔540-1 500米的河岸、塘边、田埂上、沼泽及草原湿地。欧洲和俄罗斯西伯利亚、格鲁吉亚也有分布。
以往不少学者曾将产于亚洲的本种植物定名为J. gracillimus (Buchen.) V. Krecz. et Gontsch.，作者检查了国产该种大量标本与一些俄罗斯标本并和产欧洲的J. compressus Jacq. 种的标本进行比较，发现两者形态特征无明显差异，故以合并为宜。
《Flora of China》 Vol. 24 (2000)
Juncus gracillimus (Buchenau) V. I. Kreczetowicz & Gontscharow
扁茎灯心草 bian jing deng xin cao
Juncus compressus Jacquin var. gracillimus Buchenau in Engler, Pflanzenr. 25(IV. 36): 112. 1906.
Plants perennial, laxly tufted. Rhizome thick. Stems (8--)15--80 cm, usually slightly compressed. Cataphylls absent to 3. Basal leaves 1--3; leaf blade linear, 3--15 cm × 0.5--1 mm. Distal cauline leaves 1 or 2; leaf sheath auricles rounded, ca. 1 mm; leaf blade flat, 10--15(--20) mm. Inflorescences usually lax, many branched; branches unequal, longer ones 4--6 cm; involucral bract linear, often longer than inflorescence. Bracteoles present, broadly ovate, ca. 1 mm, margin scarious, apex obtuse. Perianth segments lanceolate to oblong-lanceolate, 1.8--2.6 × 0.9--1.1 mm, apex obtuse; outer segments slightly longer and narrower than inner ones, center greenish, margin broadly scarious. Stamens 6; filaments ca. 1 mm; anthers 0.8--1 mm. Ovary oblong. Style very short; stigmas ca. 1.5 mm. Capsule globose to ovoid, ca. 2.5 mm, apex obtuse and mucronate. Seeds obliquely ovoid, ca. 0.4 mm, striate. Fl. May--Jul, fr. Jun--Aug.
River banks, pool margins, marshes, wet grasslands, ridges; 500--1500 m. Gansu, Hebei, Heilongjiang, Henan, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Qinghai, Shandong, Shanxi [Japan, Korea, Mongolia, Pakistan, Russia; Europe].
Chinese records of Juncus compressus Jacquin (e.g., in FRPS) are referable to J. gracillimus.
科名：灯心草科 Juncaceae
属名：灯心草属 Juncus
7.扁茎灯心草（植物分类学报）图版37：5-8
Juncus compressus Jacq. , Enum. Stirp. Vindob. 60 et 235. 1762; Franch. , Pl. David. 1: 311. 1884; Hook. f., Fl. Brit. Ind. 6: 393. 1894; Buchen. in Engl. Pflanzenr. 25 (IV. 36) : 111. 1906: V. Krecz. et Gontsch. in Kom. Fl. URSS. 3: 527. t. 28. fig. 1. 1935; S. Snogerup in Tutin, Fl. Europ. 5: 106. 1980.——J. compressus Jacq. var. gracillimus Buchen. in Engl. Pflanzenr. 25 (IV. 36) : 112. 1906.——J. gracillimus (Buchen.) V. Krecz. et Gontsch. in Kom. Fl. URSS. 3: 528. t. 28. fig. 2. 1935; 秦岭植物志1 (1): 305. 图277. 1976; 中国高等植物图鉴5: 410. 图7650. 1976.
多年生草本，高约（8-）15-40（-70）厘米；根状茎粗壮横走，褐色，具黄褐色须根。茎丛生，直立，圆柱形或稍扁，绿色，直径0.5-1.5毫米。叶基生和茎生；低出叶鞘状，长1.5-3厘米，淡褐色；基生叶2-3枚；叶片线形，长3-15厘米，宽0.5-1毫米；茎生叶1-2枚；叶片线形，扁平，长10-15（-20）厘米；叶鞘长2-9厘米，松弛抱茎；叶耳圆形。顶生复聚伞花序；叶状总苞片通常1枚，线形，常超出花序；从总苞叶腋中发出多个花序分枝，花序分枝纤细，长短不一，长者达4-6厘米，顶端1-2回或多回分枝，有时花序延伸长达13厘米；花单生，彼此分离；小苞片2枚，宽卵形，长约1毫米，顶端钝，膜质；花被片披针形或长圆状披针形，长1.8-2.6毫米，宽0.9-1.1毫米，顶端钝圆，外轮者稍长于内轮，较窄，内轮者具宽膜质边缘，背部淡绿色，顶端和边缘褐色；雄蕊6枚；花药长圆形，基部略成箭形，长0.8-1毫米，黄色；花丝长0.6-0.8毫米；子房长圆形，长约1.5毫米；花柱很短；柱头3分叉，长约1.5毫米。蒴果卵球形，长约2.5毫米，超出花被，上端钝，具短尖头，有3个隔膜，成熟时褐色、光亮。种子斜卵形，长约0.4毫米，表面具纵纹，成熟时褐色。花期5-7月，果期6-8月。
产东北、华北、西北、山东及长江流域诸省区。生于海拔540-1 500米的河岸、塘边、田埂上、沼泽及草原湿地。欧洲和俄罗斯西伯利亚、格鲁吉亚也有分布。
以往不少学者曾将产于亚洲的本种植物定名为J. gracillimus (Buchen.) V. Krecz. et Gontsch.，作者检查了国产该种大量标本与一些俄罗斯标本并和产欧洲的J. compressus Jacq. 种的标本进行比较，发现两者形态特征无明显差异，故以合并为宜。
《Flora of China》 Vol. 24 (2000)
Juncus gracillimus (Buchenau) V. I. Kreczetowicz & Gontscharow
扁茎灯心草 bian jing deng xin cao
Juncus compressus Jacquin var. gracillimus Buchenau in Engler, Pflanzenr. 25(IV. 36): 112. 1906.
Plants perennial, laxly tufted. Rhizome thick. Stems (8--)15--80 cm, usually slightly compressed. Cataphylls absent to 3. Basal leaves 1--3; leaf blade linear, 3--15 cm × 0.5--1 mm. Distal cauline leaves 1 or 2; leaf sheath auricles rounded, ca. 1 mm; leaf blade flat, 10--15(--20) mm. Inflorescences usually lax, many branched; branches unequal, longer ones 4--6 cm; involucral bract linear, often longer than inflorescence. Bracteoles present, broadly ovate, ca. 1 mm, margin scarious, apex obtuse. Perianth segments lanceolate to oblong-lanceolate, 1.8--2.6 × 0.9--1.1 mm, apex obtuse; outer segments slightly longer and narrower than inner ones, center greenish, margin broadly scarious. Stamens 6; filaments ca. 1 mm; anthers 0.8--1 mm. Ovary oblong. Style very short; stigmas ca. 1.5 mm. Capsule globose to ovoid, ca. 2.5 mm, apex obtuse and mucronate. Seeds obliquely ovoid, ca. 0.4 mm, striate. Fl. May--Jul, fr. Jun--Aug.
River banks, pool margins, marshes, wet grasslands, ridges; 500--1500 m. Gansu, Hebei, Heilongjiang, Henan, Jiangsu, Jiangxi, Jilin, Liaoning, Nei Mongol, Qinghai, Shandong, Shanxi [Japan, Korea, Mongolia, Pakistan, Russia; Europe].
Chinese records of Juncus compressus Jacquin (e.g., in FRPS) are referable to J. gracillimus.