Bot. Jahrb. Syst. 17: 239. 1893,.
Plants aquatic or terrestrial, annual. Stems erect when stranded, reddish purple in age, somewhat branched, 2–10 cm. Leaf blades oblong to linear, 1–5 mm, apex obtuse. Inflorescences lax; flowers 1 per node. Pedicels 0.5–6(–10) mm. Flowers 4-merous; sepals triangular-ovate to lanceolate, 0.4–1 mm, apex rounded to obtuse; petals lanceolate, 1–1.5 mm. Follicles ascending, 6–14-seeded, obliquely lanceolate; old follicles spreading, flat. Seeds oblong-ellipsoid, 0.3–0.6 × 0.1–0.3 mm, not papillate, shiny, smooth.
Phenology: Flowering spring.
Habitat: Vernal pools, shores of lakes and streams
Elevation: 0-2100 m
Calif., Mont., Nev., Oreg., Tex., Wyo., Mexico (Baja California), South America (Chile).
Described from Chile, Crassula solieri was overlooked in North America, not distinguished from C. aquatica before it was recognized by M. Bywater and G. E. Wickens (1984).