西藏水马齿 xi zang shui ma chi

Plants terrestrial on damp gravel. Leaf blade expanded; venation simple, generally limited to 1 primary and a pair of secondary veins. Flowers solitary, most frequently a pair of axils with a carpellate flower opposed by a staminate flower; bracts lacking; style shorter than 0.6 mm, persistent, reflexed; filaments straight, shorter than 0.5 mm; anthers ca. 0.2 × 0.2 mm; pollen spherical to ellipsoid, yellow, 22-26 × 19-23 µm. Fruits 0.6-0.7 × 0.8-1 mm, slightly wider than high, subsessile or with pedicel shorter than 0.6 mm, faintly reticulate; mericarps expanded toward base, but not strumose; mature fruit black, winged only at apex; wing 0.05-0.1 mm wide. Fr. Mar-Sep.

Wet soil, gravel tracks; ca. 4400 m. S Xizang [Bhutan].