拟草茨藻 ni cao ci zao

Najas tenuifolia R. Brown subsp. pseudograminea (W. Koch) W. J. de Wilde.

Stems ca. 10 cm tall, ca. 1 mm in diam. Leaves often in pseudowhorls of 3, 16-20 × 0.6-0.9 mm; sheath 1-2 mm; auricles linear, short, minutely serrulate with 3-9 teeth, upper margin on each side minutely serrulate with 30-50 teeth. Plants monoecious; flowers 1-3 per axil, male flowers in upper axils and female ones below. Male flowers elliptic, 1.4-2.3 mm; spathe with short neck; anther 4-thecous. Female flowers inconspicuous, ca. 1 mm; style ca. 1 mm; stigmas 2- or 3-lobed. Fruit 1-1.3 × ca. 0.4 mm. Seeds elliptic-oblong, with more than 20 rows of pits; areoles squarish to hexagonal or rectangular; cell walls not raised. Fl. and fr. Jul.

Known in China only from ponds on Chung Chi Campus, Hong Kong [East Timor, Indonesia, Philippines, Thailand; Australia].