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Floating Primrose Willow - Ludwigia peploides
Family: Onagraceae

TPIUC

Description

Water primrose is a creeping or floating aquatic perennial herb. The leaves are alternate, simple, and net-veined. The petiole is 1-5 cm long, and the blade is elliptic to obovate with entire margins. The flowers are axillary, perfect, and solitary. The five petals are yellow. The fruit is a capsule with many seeds. The seeds are ellipsoid, yellowish, and shorter than 1 mm.

Interesting facts

Plants grow in ditches, ponds, streams, rice fields, marshes, and other freshwater habitats. It is a fast-growing plant that can reproduce by seeds and asexually by rooting at the nodes.

The fast-growing habit allows water primrose to choke out natives and also hinder man's activities such as water travel, irrigation, etc. The dense above-water growth can also be a home for nuisance and disease-bearing insects.

VIDEO

Links to more information

US Army Corp Noxious Plant Database

MORE INFO

I took this picture of Ludwigia pelploides at the Lewisville Aquatic Ecosystem Research Facility (LAERF). This plant flowers in Mid-May and produces brilliant five-pedaled yellow flowers in the nearshore aquatic vegetation. I've seen it in drainage ditches and pond-edges forming large matas of floating vegetation.

This primrose will spread along the water surface via runners as seen here. These runners have roots that act to bring in nutrients and water. Often the runner stems are reddish color while the leaves are green