OXAGRACEAE 145 



long. 11. Gaurella. 



Capsule broadly winged, calyx tube 4-12 times as long as 



the ovary. 12. Megapterium. 



Stigma merely 4 toothed, calyx tube shorter than the ovary. 



14. Meriolix. 

 Stigma capitate, calyx tube longer than the ovary. 



13. 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. 



15. Gaura. 

 Ovary 1-celled; leaves entire. 16. Stenosiphon. 



Petals 2, stamens 2, fruit bristly with hooked hairs. 



17. Circaea. 

 Acaulescent plants, rarely producing short stems, flowers basal, 

 clustered. 

 Angles of the capsule tuberculate, seed furrowed. 



9. Pachylcphus. 



Angles of the capsule winged, smooth, seeds with a tubercle 



near one end. 10. Lavauxia. 



1. Isnardia. 652. 



1. Isnardia palustris L. 



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. Ludwigla. 653, 



Flowers sessile, about 3 mm. broad, petals minute greenish. 



1. L. polycarpa. 

 Flowers short peduncled, 12-16 mm. broad, petals large, bright yellow. 



2. L. alternifolia. 



1. Ludwigia polycarpa Short & Peter. 



In swampy places mostly in the eastern part of the state. Ainsworth; 

 Lincoln. 



2. Ludwigia alternifolia L. 



In swampy places in the southeastern part of the state. Endicott. 



3. Chamaenerion. 655. 



1. Chamaenerion angustifolium (L.) Scop. Willow-Herb, Fire-Weed. 

 In the northwestern part of the state, not abundant. 



4. Epilobium. 655. 



Leaves entire or nearly so, linear or linear-lanceolate. 1. E. lineare. 

 Leaves serrate, lanceolate. 



Mature seeds with cinnamon-colored coma, beakless, 1-5 mm. long. 



2. E. coloratum. 

 Mature seeds with white coma, short beaked, 1mm. long. 



3. E. adenocaulon. 



