192 ONAGRACE.E. (eVENING-PRIMKOSE FAMILY.) 



late and ouly siuuate-toothed ; calyx-tips free, the tube slender (2-4' long); 

 petals 6- 12" long; capsule ovate, i-V long, strongly winged, net-veined. — 

 Ky. to Miss, and Tex., west to the Pacific. 



Var. (?) parvifl6ra, Watson. Elowers very small (1-2' long), fertilized 

 in the bud and rarely fully opening; fruit abundant, forming at length a 

 densely crowded hemispherical or cylindrical mass nearly 2' in diameter and 

 often 2-3' high. — Plains of Kan. and Neb. 



-V- H- Loiv caulescent perennials ; Jloicers axillary, yellow. 



13. CE. Missouriensis, Sims. Stems decumbent; pubescence short 

 and silky, closely appressed, sometimes dense or wholly Avauting ; leaves thick, 

 oval to linear, mostly narrowly lanceolate (2 -.5' long), acuminate, entire or 

 repand-deuticulate ; calyx-tube 2-5' long ; petals broad, 1 - 2|' long ; capsules 

 orbicular, very broadly winged (1-3' long). — Mo. and Kan. to Tex. 



14. CE. Fremontii, Watson. Hoary with appressed silky pubescence ; 

 leaves linear, pointed, entire ; calyx-tube 1-2' long; petals i-1' long; cap- 

 sule hoary, oblong, narrowed at base, 9" long. — Central Kan. 



§ 2. Stigma discoid; calyx-tuhe more broadly dilated above; antliers oblong- 

 linear ; capside mostly sessile, linear-cylindric ; perennial, somewhat woody, 

 icith axillary yelloic Jlowers. 



15. CE. Hartwegi, Benth., var. lavandulsefolia, Watson. Stems 

 numerous from a woody base, 3-6' high; leaves numerous, hoary-puberulent, 

 mostly linear, {-I'long; calyx-tube 1-2' long; capsule 8-10" long. — Cen- 

 tral Kan. to Col. and N, Mex. 



16. CE. serrulata, Nutt. Slender (3-15' high), simple or branched, 

 canescent or glabrous; leaves linear to lanceolate (1-3' long), irregularly and 

 sharply denticulate ; calyx-tube broadly funnel form (2 - 4" long), strongly nerved ; 

 petals broadly obovate (3-4" long), crenulate; capsule 9-15" long. — Wise, 

 and Minn, to Mo., Tex., and N. Mex. 



5. GAURA, L. 



Calyx-tube much prolonged beyond the ovary, deciduous ; the lobes 4 (rarely 

 3), reflexed. Petals clawed, unequal or turned to the upper side. Stamens 

 mostly 8, often turned down, as is also the long style. A small scale-like ap- 

 pendage before the base of each filament. Stigma 4-lol)ed, surrounded by a 

 ring or cup-like border. Fruit hard and nut-like, 3 - 4-ribbed or angled, inde- 

 hiscent or nearly so, usually becoming 1-celled and 1 - 4-seeded. Seeds naked. 



— Leaves alternate, sessile. Flowers rose-color or white, changing to reddisli 

 in fading, in spikes or racemes , in our species quite small (so that the name, 

 from yavpos, superb, does not seem appropriate). 



* Fruit sessile or nearly so. 



1. G. biennis, L. Soft-hairy or doumy {S-S° high) ; leaves oblong-lanceo- 

 late, denticulate ; spikes wand-like ; fruit oval or oblong, acute at both ends, 2-3" 

 long, ribbed, downy. — Dry banks, N. Y. to Minn., and southward. Aug. 



2. G. parviflbra, Dougl. Soft-villous and puberulent, 2-5° high ; leaves 

 ovate-lanceolate, repand-denticulate, soft-pubescent ; spikes dense ; fruit oblong- 

 clavate, narrowed to both ends, 4-nerved, obtusely angled above, 3-4" long. 



— Mo. to La. and westward. 



