念珠冷水花Pilea monilifera Hand.-Mazz.

别名：项念冷水花;项链冷水花;

科名：荨麻科 Urticaceae

属名：冷水花属 Pilea

《中国植物志》第23(2)卷120页
  53.念珠冷水花（云南植物名录）项链冷水花（湖北植物志）图版25: 5-7
  Pilea monilifera Hand.-Mazz. Symb. Sin. 7: 124, Taf. 3, Abb. 2. 1929; Chien in Bull. Chin. Bot. Soc. 1 (1): 5. 1935; 湖北植物志1: 165, 图210. 1976, excl. fig.; C. J. Chen in Bull. Bot. Res. (Harbin) 2 (3): 91. 1982; 中国高等植物图鉴, 补编1: 182, 图8449.1982; 云南种子植物名录, 上册733-1984; 贵州植物志4: 31, 图版11 (4-7).1989.
  草本，具匍匐根状茎。茎肉质，高50-150厘米，粗4-8毫米，无毛，节间多少膨大，单一或有少数分枝。叶近膜质，同对的不等大，椭圆形、卵状椭圆形，或卵状长圆形，常不对称，长5-13厘米，宽3-7厘米，先端渐尖或尾状渐尖，基部圆形或浅心形，边缘在基部全缘，在其以上有粗圆齿状锯齿或牙齿状锯齿，上面深绿色，疏生白色硬毛，下面浅绿色，无毛，钟乳体条形，长约0.3毫米，在下面较明显，基出脉3条，其侧出的一对弧曲，伸达近先端的齿尖，侧脉多数，整齐横向，细脉末端和近齿尖处有腺点；叶柄长1-5厘米，顶端有短柔毛；托叶狭三角形，长1-2毫米，早落。雌雄异株或同株；雄花序单个生于叶腋，长3-10厘米，团伞花簇2-8个稀疏着生于单一的序轴上，呈串珠状排列，序轴无毛或疏生短柔毛；雌花序长1-3.5厘米，团伞花簇数个，呈串珠状着生于序轴上或密集排列成穗状，有时有少数分枝。雄花具梗，在芽时三角状卵形，长2-2.5毫米：花被片4，不等大，三角状卵形，先端常收缩成喙状，基部内凹或膨大呈兜状，大的二枚长约1.5-2毫米，小的二枚长约1.2-1.5毫米，有时近等大，中肋明显，外面有钟乳体，疏生短毛或无毛；雄蕊4；退化雌蕊极小，不明显。雌花近无梗，长约1毫米；花被片3，不等大，果时中间一枚近长圆状帽形，增厚，长0.5-1毫米，侧生二枚小，膜质，三角形，长约0.2毫米；退化雄蕊长圆形，长约0.4毫米。瘦果卵形，几不歪斜，扁，长约1.8毫米，熟时褐色，光滑，有稀疏的钟乳体。花期6-8月，果期7-9月。
  产云南、贵州、四川、湖北西部、湖南西部、江西南部和广西北部。生于山谷林下阴湿处，海拔(900-) 1 400-2 400 (-3 500)米。模式标本采自云南西北部。
  产于云南西北部3 500米高山地带的本种植物，雄花序与雄花被片外面被较密的柔毛，这显然是一种生态变型。

《Flora of China》 Vol. 5 (2003)
Pilea monilifera  Handel-Mazzetti
念珠冷水花   nian zhu leng shui hua
Herbs perennial, stoloniferous, monoecious or dioecious. Stems simple or branched, 50-150 cm tall, woody at base, succulent, swollen between nodes, glabrous. Stipules deciduous, narrowly triangular, ca. 1 mm, membranous; petiole unequal in length, 1-5 cm, puberulent adaxially; leaf blade abaxially pale green, adaxially dark green, elliptic, ovate-elliptic or ovate-oblong, often slightly oblique at base, unequal in size, 5-13 × 3-7 cm, submembranous, 3-veined, lateral veins many, regularly transverse, often ending in a gland, abaxial surface glabrous, adaxial surface pilose, cystoliths fusiform, often conspicuous abaxially, base rounded or subcordate, margin coarsely crenate-serrate or dentate-serrate, apex acuminate, caudate-acuminate, acumen entire. Inflorescences solitary, male a moniliform spike of 3-8 loose glomerules on simple axis, 3-10 cm, glabrous or sparsely puberulent; female inflorescence 1-3.5 cm. Male flowers pedicellate, in bud triangular-ovoid, 2-2.5 mm; perianth lobes 4, connate 1/2 of length, subapically long corniculate, sometimes puberulent; stamens 4; rudimentary ovary inconspicuous. Female perianth lobes unequal, longest lobe subapically corniculate; Achene brownish, broadly ovoid, ca. 1.8 mm, slightly compressed, smooth, but with some cystoliths, enclosed by persistent perianth. Fl. Jun-Aug, fr. Jul-Sep.
* Shaded moist places, rocks; (900-)1400-2400(-3500) m. N Guangxi, Guizhou, W Hubei, W Hunan, Jiangxi, Sichuan, Yunnan.
Collections from alpine habitats in NW Yunnan, which have puberulent male inflorescences and perianth lobes, may be ecological forms.