南溪楼梯草,云南荨麻科一新种.pdf
http: / / www.guihaia -journal.com Guihaia Mar. 2019, 39(3) : 294 - 296 DOI: 10.11931 / guihaia.gxzw201702025 引文格式: 王文采, 吴增源. 南溪楼梯草, 云南荨麻科一新种 [J]. 广西植物, 2019, 39(3): 294- 296. WANG WT, WU ZY. Elatostema nanxiense, a new species of Urticaceae fromYunnan Province [J]. Guihaia, 2019, 39(3): 294- 296. 南溪楼梯草, 云南荨麻科一新种 王文采1 , 吴增源2 ( 1. 中国科学院植物研究所 系统与进化植物学国家重点实验室, 北京 100093; 2. 中国科学院 昆明植物研究所 东亚植物多样性与生物地理学重点实验室, 昆明 650201 ) 摘 要: 该文描述了自云南东南部发现的荨麻科楼梯草属一新种,南溪楼梯草( Elatostema nanxiense) 。 此新种 与田林楼梯草( E. tianlinense) 相似,但其叶具三出脉,边缘具浅圆齿或小钝齿,雄总苞苞片较少,8 枚,排成一 层,背面有 1 ~ 3 条纵肋,只 1 枚在顶端具角状突起而与后者相区别。 此外,此新种与盘托楼梯草系的广布种盘 托楼梯草( E. dissectum) 的区别在于其茎被糙伏毛,叶呈椭圆形,具三出脉,雄头状花序的花序梗较短,雄总苞 苞片较少,呈宽卵形或横长方形,背面有 1 ~ 3 条纵肋,雄小苞片有缘毛。 关键词: 荨麻科, 楼梯草属, 新种, 云南 中图分类号: Q949.737.5 文献标识码: A 文章编号: 1000⁃3142(2019)03⁃0294⁃03 Elatostema nanxiense, a new species of Urticaceae from Yunnan Province WANG Wen⁃tsai 1 , WU Zengyuan2 ( 1. State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; 2. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Scienses, Kunming 650201, China ) Abstract: A species of the genus Elatostema (Urticaceae), E. nanxiense, is described as new from southeastern part of Yunnan Province. It is similar to E. tianlinense W. T. Wang, differing from the latter in its crenate or obtusely denticu⁃ late, trinerved leaves, and fewer 1⁃seriate and 1⁃3⁃ribbed staminate involucral bracts. Besides, it differs from E. dissec⁃ tum, which is a wide⁃spread species in sect. Elatostema ser. Dissecta W. T. Wang, in its strigillose stems, elliptic and trinerved leaves, shorter staminate peduncles, fewer broadly ovate or transversely rectangular and 1⁃3⁃ribbed staminate involucral bracts, and glabrous staminate bracteoles. Key words: Urticaceae, Elatostema, new species, Yunnan Province 南溪楼梯草 图1 Elatostema nanxiense W. T. Wang & Zeng Y. Wu, sp. nov. Fig. 1. (Sect. Elatostema ser. Dissecta W. T. Wang) 收稿日期: 2018 - 05 - 25 基金项目: 中国科学院植物研究所系统与进化植 物 学 国 家 重 点 实 验 室 项 目 [ Supported by the Program of State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences] 。 作者简介: 王文采(1926 - ) ,男,研究员,中国科学院院士,著名植物分类学家,长期从事有花植物分类学研究。 3期 王文采等: 南溪楼梯草, 云南荨麻科一新种 295 注: A. 开花植株上部; B. 雄头状花序; C. 二对生长较大雄总苞苞片; D. 雄花及 4 雄小苞片。 ( 来自模式标本) Note: A. Upper part of flowering stem; B. Staminate capitulum; C. Two opposite larger staminate bracts; D. Staminate flower and four staminate bracteoles. (From holotype) 图1 南溪楼梯草 Fig. 1 Elatostema nanxiense Ob pedunculos capitulorum staminatorum quam re⁃ paucioribus 8, 1⁃seriatis tantum singularibus apice cor⁃ laria species nova haec est similis E. tianlinense W. dentata, semi⁃triplinervia, et bracteae involucrales ceptacula leviter longiores et receptacula late rectangu⁃ T. Wang, a quo foliis margine crenatis vel obtuse den⁃ ticulatis trinervibus, bracteis involucralibus staminatis niculatis differt; in E. tianlnensi, folia margine acute staminatae multiores ca. 20, 2⁃seriatae, 6 externae omnes apice corniculatae sunt. Etiam ab E. dissecto 296 广 西 植 39 卷 物 Wedd., quod una species late distributa in sect. Ela⁃ linear⁃oblanceolate, 1 - 2.2 × 0.2 - 1.8 mm, above and sis, foliis elliptcis trinervibus ventre ad nervos basales dense, pedicellate; pedicels 0. 3 - 1 mm long, subgla⁃ tostema ser. Dissectis W. T. Wang est, caulibus strigillo⁃ strigillosis, capitulis staminatis brevius pedunculatis (pedunculis 1 - 1.8 cm longis), bracteis involucralibus staminatis paucioribus 8 late ovatis vel transverse rect⁃ angularibus dorso longitudinaliter 1⁃3⁃costatis, bracteolis staminatis superne ciliatis facele recedit; in E. dissecto, caules glabri, folia oblique oblonga semi⁃ on apex ciliate. Staminate flowers numerous, very brous; tepals 4, membranous, white, broadly triangular, 1 × 0.5 mm, apex acute, ciliate; stamens 4, glabrous, with very short filaments, anthers yellowish, oblong, ca. 0. 8 mm long; pistillode absent. Pistillate capitula and pistillate flowers unknown. 云南 ( Yunnan) : 河口县,南溪镇,马革,白沙 triplinervia glabra, capitula staminata saepe longe pedu⁃ 河 ( Hekou County, Nanxi Town, Mage, Baisha Riv⁃ crales staminatae saepe multiores lineares vel anguste rain forest near river ) , 2010⁃08⁃01, 吴 增 源 ( Zeng nculata (pedunculi 1.5 - 8 cm longi), bracteae involu⁃ lanceolatae omnes haud costatae, bracteolae staminatae glabrae sunt. er) , alt. 388 m, 河 边 雨 林 里 路 边 ( at road⁃side in Y. Wu) 10171 ( , holotype, PE) 。 南溪楼梯草的雄头状花序的花序梗比花序托 Perennial herbs. Stem ca. 25 cm tall, below ca. 2.5 稍长,雄花序托宽长方形,与具上述特征的田林楼 alternate; blades papery, obliquely elliptic, 11 - 13.5 × 的区别在于南溪楼梯草的叶在边缘具浅圆齿或小 mm in diam., strigillose, simple, ca. 6⁃leaved. Leaves 4.2- 5. 8 cm, apex acuminate, base obliquely and broadly cuneate, margin crenate or obtusely denticualte; surfaces adaxially glabrous, abaxially on basal nerves strigillose; nervation trinerved, with basal nerves adaxially flat and abaxially slightly prominent, and with two pairs of secondary nerves; cysoliths numer⁃ ous, dense, bacilliform, 0.25-0.5 mm long; petioles 1- 3 mm long; stipules papery, broadly to narrowly trian⁃ gular, 4-4.2 × 1.2 - 2.2 mm, glabrous, at apex acute, greenish and with whitish margins. Staminate capitula singly axillary, pedunculate; peduncles 1-1.8 cm long, glabrous or with a few short hairs; receptacles broadly rectangular, obscurely bilobulate, 8 - 10 × 4 - 5.5 mm, glabrous; involucral bracts 8, 1⁃seriate, membranous, glabrous, rarely on ribes with sparse short hairs, 2 op⁃ posite bracts larger, very broadly ovate, 3 - 4 × 5 - 7 mm, abaxially longitudinally 2 - 3⁃ribbed, in the largest bract, abaxially 3⁃ribbed and the apex of the central rib protruding out to form a horn⁃like projection ca. 0.6 mm long, the two pairs of the lateral bracts transversely rec⁃ tangular, 3.2 × 4-5 mm, all abaxially longitudinally 1⁃ ribbed and not corniculate; bracteoles numerous, very dense, membranous, white, linear, narrowly linear, or 梯草( Elatostema tianlinense W. T. Wang) 相似。 两者 钝齿,具三出脉,雄总苞苞片数目较少,8 枚,排成一 层,只 1 枚在顶端具角状突起;而田林楼梯草的叶在 边缘具尖牙齿,具半离基三出脉,雄总苞苞片数目 较多,约 20 枚,排成二层,外层 6 枚均在顶端具角状 突起。 南溪楼梯草与骤尖楼梯草组盘托楼梯草系 ( sect. Elatostema ser. Dissecta W. T. Wang) 中的广布 种盘托楼梯草系( E. dissectum Wedd.) 的区别在于南 溪楼梯草的茎被短糙伏毛,叶呈椭圆形,具三出脉, 下面基出脉上被短糙伏毛,雄头状花序的花序梗较 短,长 1 ~ 1.8 cm,雄总苞苞片较少,8 枚,宽卵形或横 长方形,背面具 1 ~ 3 条纵肋,雄小苞片上部被缘毛; 而盘托楼梯草的茎无毛,叶斜长圆形,具半离基三 出脉,无毛,雄头状花序的花序梗多较长,长 1.5 ~ 8 cm,雄总苞苞片常较多,呈条形或狭披针形,无肋, 雄小苞片无毛( 王文采,2014) 。 致谢 深切感谢孙英宝先生为本文绘图。 参考文献: WANG WT, 2014. Elatostema ( Urticaceae) in China [ M]. Qingdao: Qingdao Publishing House. [王文采, 2014. 中国 楼梯草属植物 [M]. 青岛:青岛出版社.]

南溪楼梯草,云南荨麻科一新种.pdf

