Family ONAGRACEA® tt 
Leaves alternate; stems erect or ascending. 2. Ludwigia. 
Calyx deciduous; hypanthium usually prolonged beyond the ovary. 
Seeds with a tuft of hairs; calyx tube little, if at all, prolonged 
beyond the ovary. 
Flowers over 15 mm. broad; petals entire. 3. Chameznerion. 
Flowers less than 15 mm. broad or the petals notched at the 
apex. 4, Epilobium. 
Seeds without a tuft of hairs; Cae tube distinctly prolonged be- 
yond the ovary. 
Caulescent plants; flowers elles or- spicate. 
Ovules and seeds usually numerous, more than four; fruit a 
dehiscent capsule. 
Stigma four-toothed or four-lobed. 
Stigma deeply cleft into 4 linear lobes. 
Capsule not broadly winged. 
Flowers yellow, nocturnal. 5. CEnothera. 
Flowers white or pink, mostly diurnal. 
Capsule not narrowed into a curved beak; leaves 
mostly over 25 mm. long. . 
Ovules in one row in each cavity of the ovary, 
ascending. 6. Anogra. 
Ovules in many rows in each cavity of the ovary, 
on slender stalks. 7. Hartmannia. 
Capsule narrowed into a curved beak, leaves 8-15 
mm. long 10. Gaurella. 
Capsule broadly winged; calyx tube 4-12 times as long 
as the ovary. . 11. Megapterium. 
Stigma merely 4-toothed; calyx tube shorter than the 
ovary. 13. Meriolix. 
Stigma capitate; calyx tube longer than the ovary. 
12. Galpinsia. 
Ovules and seeds few, 1—4; fruit indehiscent. 
Petals 4; stamens usually 8; fruit not bristly with hooked 
hairs. 
Ovary 4-celled; leaves denticulate to sinuate-toothed. 
14. Gaura. 
Ovary 1-celied; leaves entire. 15. Stenosiphon. 
_Petals 2; stamens 2; fruit bristly with hooked hairs. 
16. Circa. 
Acaulescent plants, rarely producing short stems; flowers basal, 
clustered. 
Angles of the capsule tuberculate; seed furrowed. 
8. Pachylophus. 
Angles of the capsule winged, smooth; seeds with a tubercle 
near one end. 9. Lavauxia. 
1. Isnardia. 652. 
1. Isnardia palustris L. Marsh Purslane. 
In swampy or boggy places in various localities in the state, forms 
a carpet-like covering over the mud. Grand Island; Louisville; 
Minden; Turner; Wood River. 
2. Ludwigia. 653. 
Flowers sessile, about 3 mm. broad; petals minute, greenish. 
1. L. polycarpa. 
