Kurt St, Max-Planck Institute for Plant breeding Research, Bugwood.org

Family: Pontederiaceae (Pickerelweed Family)

Synonym(s):

Duration: Perennial

Habit: Herb

Listed by:
Invasive Plant Atlas of the US: 1
Federal Noxious Weed: 1
TDA Noxious Weed: 1
TPWD Prohibited Exotic Species: 1

Description: Plants perennial, typically rooted in mud. Vegetative stems elongate, developing to and growing at water surface. Flowering stems erect, 8-12 cm, glabrous, distal inter-node 2-10 cm. Sessile leaves submersed, alternate on elongate stem. Petiolate leaves emersed; stipule 7-13 cm, apex truncate; petiole never inflated, 11-25 cm; blade round, 7-16 x 2.3-16 cm. Spikes 7-50-flowered, individual flowers open 1 day only; spathes obovate, 3-6 cm; peduncle 1.9-15 cm, pubescent with orange hairs. Perianth blue or white, limb lobes obovate, 13-25 mm, margins erose, central distal lobe dark blue at base with yellow distal spot; proximal stamens 15-29 mm, distal 6-20 mm; anthers 1.2-2.3 mm; style 3-lobed. Seeds 10-13-winged, 1-1.8 x 0.8-1.1 mm. Flowering (probably) Jun-Oct. Coastal rivers, lakes; 0-100 m.

History:

Biology & Spread:

Ecological Threat:

US Habitat:

Distribution

US Nativity: Introduced to U.S.

Native Origin: Introduced to U.S.

US States: PR

Resembles/Alternatives:

Management:

USE PESTICIDES WISELY: ALWAYS READ THE ENTIRE PESTICIDE LABEL CAREFULLY, FOLLOW ALL MIXING AND APPLICATION INSTRUCTIONS AND WEAR ALL RECOMMENDED PERSONAL PROTECTIVE GEAR AND CLOTHING. CONTACT YOUR STATE DEPARTMENT OF AGRICULTURE FOR ANY ADDITIONAL PESTICIDE USE REQUIREMENTS, RESTRICTIONS OR RECOMMENDATIONS. MENTION OF PESTICIDE PRODUCTS ON THIS WEB SITE DOES NOT CONSTITUTE ENDORSEMENT OF ANY MATERIAL.

Listing Source

Texas Department ofAgriculture Noxious Plant List
Texas Parks and Wildlife Department Prohibited Exotic Species
Invaders Program
Federal Noxious Weed
Union of Concerned Scientists
United States Forest Service Southern Research Station

Text References

Romero-Gonzalez G.A., G.C. Fernandez-Concha, R.L. Dressler, L.K. Magrath and G.W. Argus. 2008. Fora of North America: Eichhornia azurea (Swartz) Kunth, Eichhornia. 4. 1842. Accessed 21 Novemeber 2008: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=220004607

Data Source

Last Updated: 2008-11-24 by LBJWFC