中文摘要：

报道了安徽蓼属Polygonum一新变种——圆基愉悦蓼P.jucundumvar.rotundum Z.Z.Zhou＆Q.Y.Sun。新变种与原变种的区别在于：叶条状披针形,长4.5–9.0cm,宽0.5–0.9cm,基部圆形,近无柄;茎粗1.5–2.0mm。新变种在叶形上还与圆基长鬃蓼P.longisetum var.rotundatum A.J.Li相近,但其植株明显高,可达160cm,茎基部20–26节上生多数不定根,不定根长达10–16cm;花序的花梗长4–5mm,远伸出苞片外,易于区别。对新变种及其近缘种的花粉形态、花被片和瘦果微形态特征进行了扫描电镜比较观察。

英文摘要：

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 vat. 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）.