ONAGRACEAE (EVENING PRIMROSE FAMILY} 601 



5 LAVAtJXIA (Spach) Endl. Stigma-lobes linear ; flowers white or rose- 

 colored ; fruit ovoid, 4-winyed ; acaulescent. 



18. 0. trfloba Nutt. Biennial or perennial, nearly glabrous ; leaves 1-3 dm. 

 long, somewhat ciliate, long-petioled, runcinate-pinnatifid or oblanceolate and 

 only sinuate-toothed ; calyx-tips free, the tube slender, 6-20 cin. long ; petals 

 1.2-4 cm. long; capsule ovoid to ellipsoid, 2-3.5 cm. long, strongly winged, 

 neUveined. (Lavauxia Spach. ) Shaly limestone crevices, etc., Ky. and Tenn. ; 

 Assina. to Kan., Tex., and westw. (Mex.) 



Var. (?) parviflbra Wats. Seemingly annual ; flowers very small, 2.5-5 cm. 

 long, fertilized in the bud and rarely opening fully ; fruit abundant, forming 

 at length a densely crowded hemispherical or cylindrical mass nearly 5 cm. 

 in diameter and often 6-7 cm. high. (Lavauxia triloba, var. Watsoni 

 Britton.) Plains, Kan. and Neb. Little known. 



6. MEGAPTERIUM (Spach) Endl. Stigma-lobes linear ; flowers yellow; 

 fruit ellipsoidal to suborbicular, broadly 4-winged; seeds in a double row 

 in each cell, crested; caulescent. 



19. 0. missouri6nsis Sims. Decumbent, canescent-puberulent or glabrate ; 

 leaves thick, lanceolate to lance-elliptic, 5-12 cm. long, acute or acuminate, 

 entire or repand-denticulate ; calyx-tube 5-14 cm. long ; petals broad, 3-6 cm. 

 long; capsule 5-8 cm. long. (Megapterium Spach.) Limestone cliffs and 

 barrens, Mo. to Neb., Col., and south westw. 



7. CALYLOPHIS [Spach] T. & G. .Stigma disk-like, scarcely lobed; calyx- 

 tube funnel-form loith broadly dilated throat; flowers yellow; capsule 

 linear-cylindric, elongated ; suffrutescent. 



20. 0. serrulata Nutt. Slender, 1-5 dm. high, simple or branched, canescent 

 on the younger parts ; leaves linear to linear-lanceolate, 2-6 cm. long, sub- 

 entire or shallowly denticulate ; calyx-tube 6-13 mm. long, the flaring throat 

 strongly nerved ; petals broadly obovate, 8-17 mm. long, crenulate ; capsule 

 1.8-3 cm. long. (Meriolix Walp. ; M. intermedia Rydb.?) Sandy and rocky 

 places, Man. and w. Wise, to Mo. , and south westw. 



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 

 appendage before the base of each filament. Stigma 4-lobed, 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 reddish in 

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

 from -yaOpoj, superb, does not seem appropriate). 



* Fruit sessile or nearly so. 



1. G. binnis L. Soft-hairy or downy, 1-3.2 m. high ; leaves oblong-lanceo- 

 late, denticulate ; spikes wand-like ; fruit ovoid-fusiform, 4-angled, acute at 

 both ends, 4-6 mm. long, ribbed, downy. Dry banks, w. Que. to Ct. (Bishop), 

 Minn., Neb., and south w. ; casual in e. N. E. 



2. G. parvifl&ra Dougl. Soft-villous and puberulent, 1-3.6 m. high ; leaves 

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

 form or clavate, narrowed to both ends, 4-nerved, obtusely angled above, 6-8 

 mm. long. la. and Neb. to Mo., La., and westw. 



3. G. coccinea Pursh. Canescent, puberulent or glabrate, 1.5-4 dm. high, 

 very leafy ; leaves lanceolate, linear oblong or linear, repand-denticulate or 

 entire ; flowers in simple spikes, rose-color turning to scarlet ; fruit terete below, 

 4-sided and broader above, 4-6 mm. long. Man. to Mo. (Bush), N. Mex., and 

 westw.; introduced about Rochester, N. Y. (M. S. Baxter, V. Dewing). 



