Common name: Brazilian water hyacinth
Synonyms and Other Names: Piaropus paniculatus (Spreng.) Small
available through www.itis.gov
Identification: According to Barrett and Husband (1997) and CABI.org:
Habit: annual or short-lived perennial wetland emergent monocot
Stems/roots: rooted in mud in shallow water
Leaves: Submersed sessile leaves form a basal rosette and are linear to oblanceolate. Petiolate leaves are above the water surface with a cordate blade, acuminate to acute at the tip. Petiolate leaf blades grow 7.5-15 cm long, 3.5 – 9 cm wide, and the petiole may be up to 60 cm long.?
Flowers: flowers grow on separate flowering stalks in a panicle with 5-100 flowers developing over several days. The peduncle is sparsely glandular-pubescent to glabrous, 11.5-17.5 cm long; spathe linear, 13-35 mm long, the apex acuminate. Flowers are blue, white or lilac.
Fruits/seeds: Seeds form in capsules 6-8mm long. Seeds are 0.6-1.0 mm long, 0.6-0.8 mm wide with 10-12 longitudinal wings
Look-a-likes: The more common?E. crassipes?has flowers that grow in a spike rather than a paniculate inflorescence, and?E. crassipes?plants are typically free floating instead of rooted in mud. The petioles are inflated unlike in?E. paniculata.?Eichhornia azurea?differs from?E. paniculata?in floral structure with fewer flowers in spikes and it has fan-like submersed leaves (Barrett, 1989;?Q-Bank, 2016).
Hydrologic Unit Codes (HUCs) Explained
Puerto Rico &
Interactive maps: Point Distribution Maps
Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Eichhornia paniculata are found here.
Table last updated 10/17/2021
† Populations may not be currently present.
Ecology: Habitat: ephemeral pools, ditches and low-lying fields
Reproduction and spread: by seed dispersed by waterfowl and livestock in native range
Means of Introduction: probably introduced as a contaminant in shipping of plants or produce, as it was collected from a wet ditch by a railroad near a port in Florida (New York Botanical Garden, 2016).
Status: Eradicated in: Florida
Impact of Introduction: Eichhornia paniculata is listed as a prohibited aquatic plant in Florida along with all species of Eichhornia (USDA-NRCS, 2016), because of the invasive nature of other species in the Genus and is listed as an agricultural weed of rice fields in Jamaica and Cuba (Barrett, 2011).
Revision Date: 6/4/2021
Anemaet, E.R., 2021, Eichhornia paniculata (Spreng.) Solms: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2999, Revision Date: 6/4/2021, Access Date: 10/17/2021
This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the information.