Glossostigma cleistanthum

Aquatic or terrestrial, ephemeral or short-lived perennial herb, sometimes mat-forming, glabrous. Leaves 4–20 mm long; lamina oblanceolate or oblong, 2–10 mm long, 1–3 mm wide, usually 0.3–1 times longer and 1–3 times broader than petiole, base gradually narrowed, sometimes reddish, midvein apparent on lower surface, sometimes obscure on drying; petiole 2–20 mm long, flat, whitish. Flowers cleistogamous; pedicels 0–0.5 mm long, elongating slightly (to c. 1 mm long) and down-turned into the substrate when in fruit. Calyx enlarging to 1.5–3 mm long in fruit; corolla rudimentary; stamens 2; stigmatic lobe narrow-elliptic. Flowers mostly Aug.–Nov.