594 ONAGRACEAE 



long, sparingly hirsute. Onagra strigosa subulata Rydb. O. Oakesiana Rydb. 

 (Fl. Colo.). Valleys: Mont. — Colo. Suhinonl. Jl-Au. 



4. O. Cockerellii De Vries. Biennial, with a taproot; stem erect, strigose- 

 canescent; leaves lanceolate, caudate-attenuate, strigose-canescent, entire, 5-8 

 cm. long; bracts similar, with involute, curved and twisted tips; calyx-lobes about 

 2 cm. long, strigose-canescent; free tips about 3 mm. long; petals yellow; capsule 

 about 3 cm. long. Valleys: Colo. Submont. 



5. O. muricata L. Biennial, with a taproot; stem erect, 2-8 dm. high, 

 very leafy, puberulent and usually hirsute, the hairs with reddish pustulate 

 bases; leaves lanceolate, ascending, entire or sinuately denticulate, more or less 

 pubescent; inflorescence dense; calyx-lobes 15-18 mm. long; petals light yellow, 

 12-15 mm., rarely 2 cm. long; capsule 2.5-3 cm. long, more or less hirsute. 

 Sandy places: Newf. — N.Y. — Colo. — Mont. Plain — Submont. Jl-S. 



6. O. ornata (A. Nels.) Rydb. Stout biennial; stems adsurgent, 4-6 dm. 

 high, very leafy, densely and finely pubescent as well as hirsute ; leaves lanceolate 

 or linear-lanceolate, 5-15 cm. long, densely canescent, sinuate-dentate; bracts 

 lanceolate, acute; hypanthium and calyx densely canescent; sepals 2-2.5 cm. 

 long; petals deep yellow or orange, 2-2.5 cm. long; capsule 2-3 cm. long, slightly 

 tapering upwards. Onagra ornata A. Nels. Sandy soil: B.C. — Wyo. — Ida. 

 Submont. Je-Jl. 



7. O. strigosa (Rydb.) Mack. & Bush. Biennial or annual; stem erect, 

 3-10 dm., grayish strigose and hirsute; lower leaves spatulate, the other lance- 

 olate, 5-10 cm. long, more or less repand-dentate ; inflorescence leafy; calyx-lobes 

 1.5-2 cm. long, grayish-hirsute; capsule 2.5-3 cm. long, grayish hirsute. 0. bi- 

 ennis canescens T. & G. Onagra strigosa Rydb. Valleys and sandy places: 

 Minn. — Kans. — ^Utah — ^Wash. — B.C. Plain — Submont. Je-Au. 



8. O. depressa Greene. Annual or biennial; stems decumbent, 3-8 dm. 

 long, densely canescent; leaves lanceolate, repand-denticulate, densely white- 

 canescent; inflorescence leafy-bracted ; calyx and hypanthium densely canescent; 

 sepals about 12 mm. long; capsule about 3 cm. long, densely canescent. This 

 may be a form of the preceding, produced by cultivation. Dry sandy soil: Mont. 

 Jl-Au. 



9. O. longissima Rydb. A tall biennial; stem strict, 5-10 dm. high, densely 

 canescent, with short crinkled hairs as well as sparingly hirsute; leaves linear or 

 narrowly linear-lanceolate, 1-1.5 dm. long, densely canescent, entire, acute at 

 both ends; spike rather lax; hypanthium-tube 10-12 cm. long, densely canescent, 

 only slightly widening upwards; sepals linear-lanceolate, about 4 cm. long; free 

 tips about 4 mm. long; petals golden yellow, 4 cm. long; capsule about 4 cm. 

 long, densely canescent, slightly tapering upwards. Canons: Utah. — Ariz. 

 Son. Au-S. 



10. O. Jamesii T. & G. Biennial; stem decumbent or erect, canescent; 

 leaves ovate, or lanceolate-acuminate, sinuate-dentate, cinereous-canescent; 

 inflorescence leafy, few-flowered; free tube of the hypanthium 8-15 cm. long, 

 more or less pubescent; caly.x-lobes 4-6 cm. long; free tips 5-7 mm. long; petals 

 4-5 cm. long, yellow, turning rose-colored; capsule 2.5-3 cm. long. River valleys: 

 Tex. — Colo. — Ariz. Son. Jl-Au. 



11. ANOCtRA Spach. White Evening-Primrose. 



Annual or perennial caulescent herbs, often with white flaky bark. Leaves 

 alternate, usually pinnatifid or toothed. Flowers axillary, usually diurnal, from 

 drooping buds. Hypanthium produced beyond the ovary into a cylindric tube. 

 Sepals 4, narrow, reflexed. Petals white, turning pink, obcordate, showy. 

 Stigma with 4 linear lobes. Capsule cylindric, slightly angled, loculicidal, 

 4-valved, many-seeded. Seeds terete in one row in each cavity of the ovary. 



Calyx in bud merely acutish; tips not free or slightly so in no. 4. 

 Pubescence at least in part consisting of long silky hairs. 

 Capsule divergent or reflexed. 



Blades of the upper leaves rhombic-lanceolate to ovate in outline. 



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