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The Ohio Naturalist. 
[Vol. XV, No. 5, 
8. Leaves undulate or toothed; ovules and seeds horizontal prismatic- 
angled. Oenothera ( 0 ). 
8. Leaves sinuate or pinnatifid; ovules and seeds ascending not angled. 
Raimannia ((}). 
9. Leaves pinnatifid or lacinate, flowers 13^-3 in. broad; buds drooping. 
Harlmannia (8). 
10. Ovules numerous, ovulary narrow, elongated. Epilobium (4). 
10. Ovules usually 4, one in each cavity, ovulary clubshaped, narrowed 
below, anther filaments with scales at the base. Gaum 10. 
1 . Ludwigia L. 
Herbs, perennial or annual with alternate entire leaves, flowers, 
terminal or axillary; sepals usually 4, persistent; petals 4; stamens 
usually 4; capsule winged or with basal bracelets, dehiscent or 
opening by a terminal pore. 
1. Flowers inconspicuous, sessile in the axis of the leaves, with small 
greenish petals; capsules not prominently ribbed or winged, valves 
separating from the terminal disk. L. polycar pa. 
I. Flowers showy, peduncled, with large yellow petals; capsules promi¬ 
nently ribbed and winged, opening by an apical pore. L. alternifolia. 
1. Ludwigia polycarpa S. & P. Many-fruited Ludwigia. 
Plants 1-3 ft. tall with entire, sessile, narrowly lanceolate leaves, 
2-4*3 )/2 in. long; flowers small with minute greenish petals and 
acute triangular sepals; capsules, top shaped, with linear bractlets 
at the base, the valves separating from the terminal disk. Hock¬ 
ing, Cuyahoga, Auglaize, Lucas. 
2. Ludwigia alternifolia L. Seed-box. Stems erect, 2-4 ft. 
high with short-petoled, entire, lanceolate, leaves 1-3 Hi in. long, 
flowers showy, with large ovate sepals and yellow petals of about 
equal length with the sepals; capsules, winged, opening by a pore 
in the apex. Lake, Fairfield, Cuyahoga, Muskingum, Erie, 
Defiance, Hocking, Lucas, Adams, Gallia, Brown. 
2. Isnardia L. 
Annual or perennial, prostrate or decumbent, herbs, creeping 
or floating, often rooting at the nodes; leaves opposite, entire, 
narrowed at the base; flowers axillary, sessile, often without 
petals; calyx top-shaped, 4—parted, persistent; petals 4 or none; 
stamens 4; ovulary with 4 cavities; stigma 4 lobed; capsule 
4 angled; seeds numerous. 
1. Isnardia palustris L. Marsh Purslane. Procumbent or 
floating herbs, glabrous, branched 4-15 in. long; leaves ovate, 
narrowing at the base 3^-1 p 2 in. long; flowers solitary in the 
axils of the leaves, about | in. broad; sepals 4, acute; petals, if 
present, reddish. Crawford, Summit, Ottawa, Knox, Hancock, 
Stark, Wayne, Madison, Lucas, Wyandot, Licking, Lorain, Lake. 
Franklin, Defiance, Geauga, Huron, Warren, Erie, Belmont. 
