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易同培, 杨林. 云南西北部玉山竹属二新种[J]. 四川林业科技, 2016, 37(1): 23-26. DOI: 10.16779/j.cnki.1003-5508.2016.01.004
引用本文: 易同培, 杨林. 云南西北部玉山竹属二新种[J]. 四川林业科技, 2016, 37(1): 23-26. DOI: 10.16779/j.cnki.1003-5508.2016.01.004
YI Tong-pei, YANG Lin. Two New Species of Yushania Keng f.(Poaceae) from Northwestern Yunnan in China[J]. Journal of Sichuan Forestry Science and Technology, 2016, 37(1): 23-26. DOI: 10.16779/j.cnki.1003-5508.2016.01.004
Citation: YI Tong-pei, YANG Lin. Two New Species of Yushania Keng f.(Poaceae) from Northwestern Yunnan in China[J]. Journal of Sichuan Forestry Science and Technology, 2016, 37(1): 23-26. DOI: 10.16779/j.cnki.1003-5508.2016.01.004

云南西北部玉山竹属二新种

Two New Species of Yushania Keng f.(Poaceae) from Northwestern Yunnan in China

  • 摘要: 本文发表了云南西北部玉山竹属2新种:哈巴玉山竹Yushnia habaensis Yi et L.Yang和马辔簕Yushania gongshanensis Yi et L.Yang。哈巴玉山竹相似金平玉山竹Y.bojieana Yi,但秆较高大,高4 m~7m,直径1.5~2(2.5)cm,节间分枝一侧基部稍扁平或有时具1浅而短的纵凹线,纵细线棱纹较明显,实心或近实心,髓海绵状,干后较硬;箨鞘远长于节间(常长过节间1/3);小枝具叶较少,为(1)2枚~4枚;叶片较窄,宽5 mm~6.5(10) mm,次脉较少,为2对~3对,区别显著。马辔簕近似弯毛玉山竹Y.flexa Yi,区别在于秆柄较粗,直径达2 cm,节间长达2.5(3)cm;秆的节间较短,长20 cm~22 (26)cm,中空;箨鞘远长于节间,背面疏生瘤基刺毛;叶鞘较短,长(1.8)2.2 cm~3.5 cm,叶片较窄,宽(5)6.5 mm~10 mm,易于区别。

     

    Abstract: In this paper two new species of Yushania Keng f.are reported from Northwestern Yunnan.Yushnia habaensis Yi et L.Yang is similar to Y.bojieana Yi,but taller culms,4~7 m high,1.5~2 (2.5) cm diam.,internodes complanate or short longitudinal ditch on base a side of ramification,obviously longitudinal bridles,solid or subsolid,spongioplasm medullary and rigidity by drying;culm-sheaths culm sheath as long as internodes (length over 1/3 of internode),a few leaves,2~4 per ultimate branch,narrower blade,5~6.5 (10) mm broad,secondary veins 2~3 paired.Yushania gongshanensis Yi et L.Yang seperates from Y.flexa Yi by rhizome neck of thicker,to 2 cm diam,internodes to 2.5 (3) cm long;shorter internodes of culms,20~22 (26) cm long,hollow,longer than internodes,back surface sparse tuberculate setose;shorter leaf-sheath,(1.8) 2.2~3.5 cm,narrower blades,(5) 6.5~10 mm wide.

     

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