Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains, and in the southeastern and northeastern regions of North America.
Habitat: Mud flats and vernal pools.
Flowers: April-August
Origin: Native
Growth Duration: Annual
Conservation Status: Not of concern
Weak, glabrous annual with prostrate and nodally rooting to ascending to erect, freely-branching stems 2-6 cm. long.
Leaves opposite, entire, succulent, linear or linear-oblanceolate, 3-6 mm. long, with sheathing bases.
Flowers minute, single in the leaf axils, greenish, the pedicles short in flower but lengthening up to 6 mm. in fruit; calyx cup-shaped, 0.5-1 mm. long, with 4 ovate-triangular lobes about half the length; petals 4, membranous, whitish, oblong-lanceolate, 1.5 mm. long; stamens 4, shorter than the petals.
Follicles less than 2 mm. long, erect, purplish.
Publication: Nat. Pflanzenfam. 51[III,2a]: 37. 1890.
Crassula vaillantii (Willd.) Roth., misapplied
Hydrophila vaillantii House
Tillaea angustifolia Nutt. var. bolanderi S. Watson
Tillaea aquatica L. [HC]
Tillaea bolanderi (S. Watson) Greene
Tillaea drummondii Torr. & A. Gray var. bolanderi (S. Watson) Jeps.
Tillaea vaillantii A. Gray, invalid name
Tillaeastrum pringlei Rose
PNW Herbaria: Specimen records of Crassula aquatica in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Crassula aquatica checklist entry.
OregonFlora: Crassula aquatica information.
E-Flora BC: Crassula aquatica atlas page.
CalPhotos: Crassula aquatica photos.
USDA Plants: Crassula aquatica information.
