Gaura 



ONAGRACEAE 



707 



Miles 

 50 



Map 1491 



Oenothera perennis L, var. typica 



roadside to which it had escaped from a cemetery, and a roadside where 

 it was common, and also in an adjoining alfalfa field. I planted some of it 

 and when, in two years, it had spread by underground rootstocks over a 

 large area, it became necessary to destroy it and the process required three 

 years of careful work. Since I never permitted it to seed I do not know 

 its ability to propagate from seed but most species of this genus should 

 be regarded with suspicion. This species, no doubt, in time will become an 

 obnoxious weed. 



Mo. and Kans., southw. to Tex.; introd. eastw. to Ind. and reported 

 from Ohio. 



11. Oenothera tiiloba Nutt. (Lavauxia triloba (Nutt.) Spach). Map 

 1493. Dry, rocky, wooded bluff of the Ohio River near Madison, Jefferson 

 County. I have a specimen, too, collected by Wm. H. Rudder near Salem, 

 Washington County. No doubt a native of some of the hills of southern 

 Indiana. Biennial in Indiana ; flowering from spring sown seed. 



Ind., Ky. to Kans., southw. and westw. to Miss., Tex., and Mex. 



5819. GAURA L. 



[Munz. A revision of the genus Gaura. Bull. Torrey Bot. Club 65: 

 105-112 and 211-228. 1938.] 



Fruit sessile or nearly so; leaves pubescent. 



Flowers 3-4 mm wide; fruit glabrous, somewhat terete, not with four symmetrical 

 sides; leaves ovate-lanceolate; plants not branching at the base. .1. G. parviflora. 

 Flowers 8-10 mm wide; fruit pubescent, with four symmetrical sides; leaves nar- 

 rower than those of the preceding species. 

 Plants not branching at the base, mostly 60-120 cm high; flowers white, turning 



pink or pinkish; fruit without a necklike base 2. G. biennis. 



Plants branching at the base, mostly 15-50 cm high; flowers rose colored, turning 



scarlet; fruit with a necklike base nearly as long as the body. .3. G. coccinea. 



Fruit on short pedicels ; leaves glabrous or nearly so 4. G. filipes. 



1. Gaura parviflora Dougl. Map 1494. In 1910 I found this plant 

 well established in Indianapolis along White River near the Vandalia 



