338 ONAGRACEAE (EVENING PRIMROSE FAMILY) 



3. Onagra Jamesii (T. & G.) Small, 1. c. 840. Stems stout, canescently 

 strigillose, decumbent, 1-4 m. long, more or less branched: leaf -blades nar- 

 rowly oblong or lanceolate, 5-20 cm. long, often curved, acute, repandly 

 denticulate, the lower ones narrowed into short petiole-like bases, the upper 

 senile or nearly so: calyx-tube stout, 5-11 cm. long: calyx-lobes nearly linear, 

 about half as long as the tube: corolla showy, yellow, turning to rose: cap- 

 suit > tapering upward, 35-40 mm. long. Southern Colorado and southward. 



6. ANOGRA Spach. WHITE EVENING PRIMROSE 



Caulescent annual or perennial herbs, often with a papery bark. Stems some- 

 times somewhat woody. Leaves alternate; blades usually pinnatifid. Buds 

 drooping. Flowers usually axillary, diurnal. Calyx-tube elongated; sepals 

 narrow. Corolla white or pink. Ovary slender; ovules numerous, in 1 row 

 in each cavity, ascending. Capsules elongated, spreading or ascending, lo- 

 culicidal. Seeds terete. Oenothera in part. 



Calyx in bud merely acutish, the tips of its lobes not free. 



Capsule erect or ascending; seeds pitted 1. A. albicaulis. 



Capsule divaricate; seeds smooth . . . . . . 2. A. violacea. 



Calyx in bud acuminate or acute, the tips of its lobes free. 

 Capsule linear-cylindric; throat of the calyx glabrous. 

 1 Calyx glabrate, or sparsely hairy, or glandular-puberulent. 



Leaves deeply pinnatifid . . . . . . . 3. A. rhizomata. 



Leaves subentire or toothed or some of them short-lobed. 



Capsule straight, ascending; leaves pubescent beneath . 4. A. Nuttallii. 

 Capsules divaricate, usually some of them contorted or 



twisted; leaves glabrous . . . . . . 5. A. pallida. 



Calyx villous or densely strigose. 



Leaves, at least some of them, deeply pinnatifid . . . 6. A. trichocalyx. 

 Leaves subentire or sinuately toothed. 



Silvery-canescent . . . . . . . . 7. A. cinerea. 



Dark green and hispid-villous . . . . . 8. A. neo-mexicana. 

 Capsule oblong; throat of the calyx hairy; leaves rather finely 



pinnatifid . . . . . . . . . . 9. A. coronopifolia. 



1. Anogra albicaulis (Pursh) Brit. Mem. Torr. Club 5: 234. 1894. Stems 

 diffusely branched, the branches decumbent or ascending, 1-3 dm. long, more 

 or less hirsute or puberulent, with whitish and often shreddy bark: leaves al- 

 ternate; blades oblanceolate or lanceolate, deeply pinnatifid or the lower ones 

 repand-dentate (rarely entire), 2.5-10 cm. long: sepals lanceolate, acuminate, 

 hirsute, the tips not free in the bud: corolla 3.5-7.5 cm. broad, white, becom- 

 ing rose-color: capsules linear-cylindric, 2.5-3.5 cm. long: seeds finely pitted. 

 Oenothera pinnatifida. (A. Buffumii A. Nels. Bull. Torr. Bot. Club 27: 267. 

 1900.) On the plains east of the mountains, Dakota to New Mexico. 



2. Anogra violacea A. Nels. Bull. Torr. Bot. Club 31: 242. 1904. Stems 

 several to many, decumbent at base, 2-3 dm. high, usually violet or purplish 

 (broadly splotched), appearing smooth but puberulent under a lens: crown 

 leaves rather small, linear-ob lanceolate, entire or toothed; stem leaves pu- 

 berulent, dark green, numerous, 4-8 cm. long, linear-oblong or narrowly ob- 

 lanceolate, coarsely sinuate-dentate and some of them deeply pinnatifid; the 

 lobes acute, triangular to oblong: buds drooping, oblong or slightly enlarged 

 towards the obtusish tip, pubescent with flat, crinkled hairs: calyx-lobes a 

 little more than half as long as the tube: petals triangular-obcordate, sinus 

 broad and shallow, 15-20 mm. long, scarcely longer than the calyx-lobes, 

 white, drying pink: capsule subangulate, sinuate-tubercled on the margins. 

 Sandy slopes and washes; Wyoming and Colorado. 



:i. Anogra rhizomata A. Nels. 1. c. 26: 240. 1899. Perennial: rhizome 



horizontal, long, thick, giving rise at intervals to short, obliquely ascending 



ti-ms several, 1-2 dm. high, from pinkish to light violet, puberulent: 



Horn nearly entire to deeply pinnatifid, linear-oblong, 3-5 cm. long, 



more or less hispid-eihate and puberulent: buds acute at apex, sometimes 



glabrate: calyx-tips free, lobes shorter than the petals, usually much shorter 



than the tube: petals white or pink, suborbicular: capsule linear, somewhat 



