Plant: Annual, short-lived perennial herb, glabrous; stem decumbent to erect, 1-5(12) cm Leaves: opposite, ± 4-ranked; blades ± entire, bases wedge-shaped to ± rounded, tips rounded, ovate, narrowly oblong; petiole 1/4-1/3 blade or indistinct; flat, ± blade-like INFLORESCENCE: flowers 1 per node Flowers: sepals 2 or, if 3, 1 < others, widely elliptic, membranous, very pale green; petals 3, equal, = and ± wider than sepals, widely elliptic, membranous, pale greenish white; stamens 3, opposite sepals; stamens 3, 6, 8, rarely 1, filaments ± 1/2 X to ± = petals, anthers widely ovoid; styles 3-4 Fruit: Fruit: capsule, ± spheric or depressed-ovoid; chambers 3, each 3-15- seeded; pedicel generally ± ; Seed ± visible through fruit wall, widely oblong, curved ± 15 degrees; pits 10-15 per row, wider than long, brown to yellowish brown; surface net-like Misc: Muddy shores, shallow pools; 50-500 m.; Apr-Sep