Triglochin scilloides (Poir.) Mering & Kadereit

Annual, tufted, aquatic or wetland herb; roots fibrous. Leaves ± erect, basally terete, becoming linear distally, 7–30 (–69) cm long, 2–8 mm diam.; basal sheath ligulate, the ligule c. 2 mm long. Scape cylindric, 3–49 cm long, 2–3 mm diam. Inflorescence of two sessile female flowers and one staked spike of bisexual flowers all axillary in a leaf sheaf; spike sometimes with lower or upper flowers male only. Perianth absent in female flowers, of one bract-like tepal in bisexual and male flowers. Stamen one in bisexual and male flowers. Gynoecium unilocular but probably 3-carpellate; central axis absent; stigma papillose, terminal; ovule one. Female flower: ovary sessile; style threadlike, arising apically but at right angles to ovary surface, 5–45 cm long. Bisexual flower: perianth segment gibbous at base, c. 1.5 mm long; style short and thick. Fruiting spike 7–22 mm long, 5–11 mm diam., with c. 3–100 densely overlapping fruits. Fruits an achene, longitudinally ridged; fruit of female flower 6–10 mm long, 2–3 mm wide, usually with apical horns or hooks; fruit of bisexual flower compressed-ellipsoid, 4–8 mm long, c. 2 mm wide, with narrow lateral wings.

Occurs in swamps, creeks, pools and drains on damp mud or in still to slow-flowing fresh water to 45 cm deep; associated with small grass, sedge and Juncus species. Alt. 20–530 m.

Can be grown by seedlings.