Tillaeastrum longipes Rose, Contr. U.S. Natl. Herb. 13: 301. 1911 (as Tilleastrum)

Plants aquatic or terrestrial, annual. Stems spreading (in water) or erect, yellow in age, branched, to 25 cm if aquatic, to 5 cm if terrestrial. Leaf blades lanceolate to oblanceolate, 2-5 mm, apex acute to obtuse. Inflorescences lax; flowers 1 per node. Pedicels 1-8 mm. Flowers 4-merous; sepals triangular-ovate, 0.4-0.7 mm, apex obtuse; petals lanceolate, 1.1-1.7 mm. Follicles ascending, 12-14-seeded, obliquely lanceoloid; old follicles spreading, flat. Seeds oblong with rounded ends, 0.2-0.4 × 0.1-0.2 mm, not papillate, dull, rugulose.

Flowering spring. Aquatic or in wet sand or mud; 0-400 m; Ala., Ark., La., Miss., Tex.; Mexico; s South America.

M. Bywater and G. E. Wickens (1984) showed Crassula longipes in southern Florida, but according to D. B. Ward (pers. comm.), the record is probably based on a W. M. Carpenter collection from East Feliciana Parish, Louisiana.