细齿水蛇麻 xi chi shui she ma

Herbs, perennial, to 60 cm tall. Stem branched; branchlets densely pubescent. Petiole 4-5 mm, hairs spreading; leaf blade triangular-ovate, 2.5-7.5 × 0.8-4 cm, papery, abaxially spreading pubescent, adaxially with sparse appressed hairs, base truncate to ± cordate and not decurrent on petiole, apex acuminate to acute; basal veins 2, secondary veins 4 or 5 on each side of midvein. Inflorescences 1 or 2 per axil, cymose, ca. 6 mm wide; peduncle ca. 4 mm. Flowers green. Male flowers: pedicel short; calyx campanulate, sparsely covered with short pubescence, lobes triangular boat-shaped; anthers globose; pistillode conic. Female flowers: sessile; calyx pubescent; ovary globose, oblique, somewhat depressed, apically 3-ridged; style 2-2.5 mm, 3-4 × as long as ovary. Achenes reddish brown, compressed, 3-angled, ca. 1 mm. Fl. Jun-Nov.

Grassy areas in wastelands, trail sides. Taiwan [Indonesia, New Guinea, Philippines; Pacific Islands (New Caledonia)].