Ludwigia peploides ssp glabrescens (Kuntze) P.H. Raven

Floating Primrose Willow

Ludwigia peploides ssp. glabrescens plant

Family - Onagraceae

Stems - With various growth patterns from erect to repent, on land or floating, herbaceous, glabrous or sparsely pubescent, often reddish, from fibrous roots, to +50cm long.

Ludwigia peploides ssp. glabrescens stem

Leaves - Alternate, petiolate, glabrous, oblong to elliptic, tapering to base, acute at apex, entire, to +/-12cm long (with petiole), +2cm broad. Venation pinnate, with lateral veins distally fused to marginal vein. Leaf upper surfaces usually glossy.

Ludwigia peploides ssp. glabrescens leaves

Ludwigia peploides ssp. glabrescens leafLeaf abaxial.

Flowers - Solitary in leaf axils, on peduncles to +/-6cm, elongating in fruit, glabrous or nearly so, with two sub-opposite bracts. Floral tube to 1.2cm in flower, 5-angled, tube subtended by two green scalelike bracts. Petals 5, free, yellow, 1.7cm long, 1.2cm broad, glabrous. Style 6-7 mm long, glabrous. Stigma flattened, 3mm broad. Stamens 10. Filaments to 4.5 mm long, glabrous, pale yellow. Anthers yellow. Ovary inferior, many seeded. Sepals 5, lanceolate, 1cm long, 3mm broad, acute, glabrous. Capsule (fruit) to -4cm long, +/-4mm in diameter, glabrous or with sparse pubescence. Seeds numerous.

Ludwigia peploides ssp. glabrescens bractsBracts of the peduncle.

Ludwigia peploides ssp. glabrescens calyxCalyx.

Ludwigia peploides ssp. glabrescens flower

Flowering - May - October.

Habitat - Shallow still water, muddy soil, pond margins.

Origin - Native to U.S.

Other info. - This species can be found scattered throughout much of MIssouri but is mostly absent in the northern 1/4 of the state and also in the central Ozark region. The petals of this plant, and most of the plants related to it, fall off very easily. In still areas the plant can be quite showy when in full flower. In windy or high traffic areas the flowers may hold their petals only a short time.
This plant is often found growing in shallow water over muddy bottoms. The stems can creep over dry ground for a good distance. The stems are "spongy" internally and easily broken.
Synonyms formerly used for this species include Ludwigia peploides (H.B.K.) Raven. Jussiaea diffusa Forsk., and Ludwigia ascendens (L.) Hara

Photographs taken off Hwy 65, Alabama, 6-20-04.