东北水马齿 dong bei shui ma chi

Callitriche bengalensis Petrov, Izv. Glavn. Bot. Sada S.S.S.R. 27: 358. 1928; C. elegans Petrov; C. verna subsp. elegans Petrov ex Komarov & Alissova; C. verna var. elegans (Petrov) Kitagawa.

Flowers generally with a carpellate and staminate flower in one of a pair of axils opposed by a single carpellate flower in other axil, very occasionally 2 carpellate flowers and 1 staminate flower in a single axil; bracts caducous, 0.8-1.2 mm, falcate; styles erect to slightly spreading, shorter than 1.5 mm; filaments ± straight, fugacious, rarely visible in axils below rosettes, shorter than 2.2 mm; anthers ca. 0.4 × 0.3 mm; pollen yellow, ovoid-ellipsoid, 21-26 × 17-25 µm. Fruit 1-1.4 × 0.7-1.1 mm, widest above middle, slightly strumose, black when mature, mericarps sharply reticulate, reticulations appearing ± clearly in vertical rows; wing less than 0.3 mm wide, mainly toward apex. Fr. throughout year.

Lakes, ponds, streams, ditches, swamps, marshes; near sea level to 5000 m. N Heilongjiang, Hong Kong, Jiangxi, E Jilin, Liaoning (Anshan), E Nei Mongol [Japan, E Russia].