J Syst Evol ›› 2007, Vol. 45 ›› Issue (5): 713-718.DOI: 10.1360/aps06205

• Research Articles • Previous Articles     Next Articles

Polygonum jucundum var. rotundum Z. Z. Zhou & Q. Y. Sun, a new variety of Polygonaceae from Anhui, China

1ZHOU Zhong‐Ze, 1SUN Qing‐Ye, 2XU Wen‐Bin, 1SHEN Jun, 1XU LI‐Lin, 1ZHAO Xiu‐Xia   

  1. 1(Anhui Key Laboratory of Eco-Engineering and Bio-Technique, School of Life Sciences, Anhui University, Hefei 230039, China)

    2(Administrative Bureau of Anhui Shengjin Lake National Nature Reserve, Dongzhi, Anhui 310029, China)zhzz@ahu.edu.cn
  • Received:2006-12-19 Published:2007-09-18

Abstract: Polygonum jucundum var. rotundum Z. Z. Zhou & Q. Y. Sun, a new variety of Polygonum (Polygonaceae) from Shengjin Lake, southeastern Anhui, China, is described and illustrated. The variety differs from P. jucundum var. jucundum Meisn. by having leaf blade linear-lanceolate, 4.5–9.0×0.5–0.9 cm, base rounded, petiole nearly absent, and stems 1.5–2.0 mm in diam. The new variety is similar to P. longisetum var. rotundatum A. J. Li in leaf shape, but differs by plants taller, up to 160 cm, rooting at 20–26 base nodes, adventitious roots 10–16 cm long, pedicels longer than bracts, 4–5 mm long. The pollen morphology, tepal and fruit microcharacteristics of the new variety and its relatives were comparatively observed under the scanning electron microscope (SEM).

Key words: Polygonum, Polygonum jucundum var. rotundum Z. Z. Zhou & Q. Y. Sun, Polygonaceae, new variety, Anhui, China