464 The Ohio Naturalist. [Vol. XV, No. 5, 



8. Leaves undulate or toothed; ovules and seeds horizontal prismatic- 

 angled. Oenothera (5). 



8. Leaves sinuate or pinnatifid; ovules and seeds ascending not angled. 



Rdimannia ((3). 



9. Leaves pinnatifid or lacinate, flowers 1.^/2-3 in. broad; buds drooping. 



Hartmannia (8). 



10. Ovules numerous, ovulary narrow, elongated. Epilobium (4). 



10. Ovules u.sually 4, one in each cavity, ovulary clubshaped, narrowed 

 below, anther filaments with scales at the base. Gaura 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. polycarpa. 



1. Flowers showy, peduncled, with large yellow petals; cap.sules promi- 

 nently ribbed and winged, opening liy an apical pore. L. aJternifolia. 



1. Ludwigia polycarpa S. & P. Many-fruited Ludwigia. 

 Plants 1-3 ft. tall with entire, sessile, narrowly lanceolate leaves, 

 ^-3^ 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 temiinal 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^ in. long, 

 flowers showy, with large o^^ate 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, Galha, Brown. 



2. Isnardia L. 



Annual or perennial, prostrate or decumbent, herbs, crecjjing 

 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 Yi-Xy^ in. long; flowers solitary in the 

 axils of the leaves, about | in. broad; sepals 4, acute; petals, if 

 present, reddish. Crawford, wSummit, Ottawa, Knox, Hancock, 

 Stark, Wayne, Madison, Lucas, Wyandot, Licking, Lorain, Lake, 

 Franklin, Defiance, Geauga, Huron, Warren, Eric, Bchnont. 



