Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
31. Onagraceae, the Evening Primrose Family
3. Ludwigia L. -- Seedbox
1. Ludwigia palustris (L.) Ell. -- Marsh seedbox
Stems creeping and rooting at the nodes or floating, simple to freely
branched, 1-5 dm long, glabrous or with few scattered hairs on younger portions.
Leaves opposite, the blades elliptic to elliptic-ovate, 3-25(40) mm long,
4-20 mm wide, shiny green or reddish, acute to acuminate, tapered at the base
to a winged petiole 3-25 mm long. Sepals deltate, 1-2 mm long; petals
none; bracteoles at base of the ovary to 1 mm long or absent. Capsule
elongate-globose, somewhat 4-angled, with a longitudinal green band on each
angle, 2-5 mm long, 2-3 mm thick; seeds whitish or yellowish-brown, curved-oblong,
0.5-0.9 mm long. Jun--Sep. Shallow water or mud of ponds, lakes, streams, ditches
and around springs; uncommon, n and c NE; (N.S. to B.C., s to FL, TX and CA;
also Mex., S.Amer., Eurasia and Africa).
North American plants belong to var. americana Fern. & Grisc.
Previous Species -- Epilobium leptophyllum Raf.
-- Narrow-leaved willow herb
Return to Family -- Onagraceae - The
Evening Primrose Family
Next Species -- Ludwigia polycarpa Short & Peter
-- Many-seed seedbox