Eichhornia, 3. 1842.

Common names: Water-hyacinth jacinthe d’eau
Etymology: for Johann A. F. Eichhorn, 1779–1856, Prussian statesman
Synonyms: Piaropus Rafinesque
Treatment appears in FNA Volume 26. Treatment on page 38. Mentioned on page 37.
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Herbs, annual or perennial, rooting in mud or free-floating. Vegetative stems submersed and growing to surface, or emersed and short. Flowering stems emersed. Sessile leaves forming basal rosette or alternate on elongate vegetative stem; apex acuminate. Petiolate leaves floating or emersed; blade cordate to ovate or round, coriaceous, apex obtuse. Inflorescences spicate, up to 30-flowered, elongating over several days; spathes folded, with acuminate to caudate extension. Flowers open 1 day only; perianth with tepals connate for more than 1/2 its length, blue, mauve, or rarely white, funnelform, limb lobes obovate to oblanceolate, longer than 2 cm, glandular-pubescent, apex obtuse to acute; stamens 6, distal 3 shorter than proximal 3; filaments curved upward near apex, purple, glandular-pubescent; anthers yellow, rounded to oblong; ovary incompletely 3-locular; ovules many; style 3-lobed. Fruits capsular, elongate. Seeds 10–200, ovoid, testa with longitudinal wings.


Introduced; Neotropics and Africa.


Species 7 (2 in the flora).

Eichhornia paniculata (Sprengel) Solms-Laubach [syn. Piaropus paniculatus (Sprengel) Small] was reported by J. K. Small (1913) as occurring in drainage ditches of peninsular Florida. The collection was made in 1907 in Manatee County (J. K. Small s.n., NY). This species can be recognized by its growing rooted in mud and by the presence of cordate leaves and an elongate flowering stem terminated by a panicule of 20–100 flowers.

Eichhornia diversifolia (Vahl) Urban, native to Puerto Rico, is not known to occur in the flora area.


1 Plants typically free-floating; sessile leaves produced in rosette; petioles commonly inflated perianth limb lobe margins entire Eichhornia crassipes
1 Plants typically rooted in mud; sessile leaves alternate on elongate stem; inflated petioles absent; perianth limb lobe margins erose Eichhornia azurea