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EPILOBIACEAE. 
3. Gayophytum Nuttallii T. & G. On hillsides from S. D. and Wash, to 
Colo., Ariz. and Calif.—Alt. 6000-8000 ft.—Parlin, Gunnison Co.; foot-hills, 
Larimer Co. 
4. Gayophytum racemosum T. & G. In sandy soil from Wyo. and Wash, to 
Colo, and Calif.—Alt. 5000-12,000 ft.—Headwaters of Clear Creek; Veta 
Pass; above Mancos; along the Poudre. 
4. ONAGRA Adans. Evening Primrose. 
Hypanthium slender, 2.5-5 cm. long. 
Petals 1-2 cm. long, yellow; pubescence rarely hirsute. 
Plant green; capsule 3-4 cm. long. 1. O. Oakesiana. 
Plant grayish strigose; capsule 2-3 cm. long. 2. O. strigosa. 
Petals 2-3.5 cm. long, often pinkish; plant more or less hirsute. 
3. O. Hookeri. 
Hypanthium stout, 6-13 cm. long. 4. O. Jamesii. 
1. Onagra Oakesiana (A. Gray) Britton. ( Oenothera Oakesiana A. Gray) 
In rich valleys from Que. and S. D. to N. Y. and Colo.—Alt. up to 10,000 ft.— 
Salida; North Cheyenne Canon; Valley Spur. 
2. Onagra strigosa Rydb. In valleys and on plains from Minn, and Wash, 
to Kans., N. M. and Utah.—Alt. 4000-7000 ft.—Ft. Collins; Colorado Springs; 
Gunnison; Elk River, Routt Co.; Engelmann Canon; Poudre Canon; Gyp¬ 
sum; soldier Canon. 
3. Onagra Hookeri (T. & G.) Small. ( Oenothera Hookeri T. & G.; 0 . 
biennis hirsutissima A. Gray) In valleys from Ida. to N. M. and Calif.; 
also Mex.—Alt. 6000-10,000 ft.—Black Canon of Gunnison; Canon City, 
Fremont Co.; Pagosa Springs; Parrott Post Office; west of Ouray; Waha- 
toya Creek; Pike’s Peak; Durango; along Conejos River north of Antonito. 
4. Onagra Jamesii (T. & G.) Small. ( Oenothera Jamesii T. & G.) In 
dry soil from Okl. and Utah to Tex. and Ariz.—On Platte River (?). 
5. ANOGRA Spach. White Evening Primrose. 
Calyx in bud merely acutish ; tips not free. 
Capsule divergent or reflexed. 1. A. violacea. 
Capsule erect or ascending. 2. A. albicaulis. 
Calyx in bud acuminate or acute ; tips free. 
Capsule linear-cylindric; throat of the calyx glabrous. 
Calyx sparingly long-hairy, glandular-puberulent or glabrous, not strigose. 
Leaves deeply pinnatifid. 3. A. rhizomata. 
Leaves subentire, dentate or short-lobed. 
Capsules strongly ascending, straight; leaves linear, entire or nearly so, 
strigose beneath. 4. A. Nuttallii. 
Capsules divergent, usually curved upwards; leaves usually denticulate 
or sometimes lobed. 
Leaves glabrous, except the margins. 5. A. Vreelandii. 
Leaves pubescent on both sides. 6. A. cinerea. 
Calyx and hypanthium densely grayish strigose ; leaves cinerous. 
7. A. latifolia. 
Capsules oblong; throat of the calyx hairy; leaves deeply pinnatifid. 
8 . A. coronopifolia. 
1. Anogra violacea A. Nels. In sandy soil of Wyo. and Colo.—Alt. 4000- 
5500 ft.—Deer River; Palisades; Hotchkiss. 
