EVENING-PRIMROSE FAMILY 595 



Blades of all the leaves deltoid-lanceolate, sinuate-dentate, acuminate or 



acute; capsule reflexed. 1. A. deltoidea. 



Blades of the lower leaves spatulate, sinuate or round-lobed obtuse' cap- 

 sules divergent. 2. A. Engelmannii. 

 Blades of all leaves linear, oblanceolate or oblong in outline. 



Leaf-blades linear or the lower linear-oblanceolate, sinuately dentate- 



calyx with a few long hairs. 3. A. Buffumi. 



Leaf-blades oblanceolate or oblong in outline, sinuately pinnatifld, with oblong 



lobes ; calyx densely silky villous. 4. A. violacea. 



Capsule erect or ascending. 



Seeds narrow, smooth, very acute at the apex; petals 1-1.75 cm. long. 



Seeds ovoid, ridged and tubercled, rather blunt at the apex. 



Branches erect; petals 1.52 cm. long. 6. A. perplexa. 



Branches decumbent or merely ascending; petals 2.5-4 cm. long. 



7. A. albicaulis. 



Pubescence wholly cinereous-strigose. 8. A. Bradburiana. 



Calyx in bud acuminate or acute; tips free. 



Capsule linear-cylindric; throat of the corolla glabrous. 



Lea ves all long-petioled, oblanceolate, subentire; plant dwarf. 9. A. simplex. 

 Stem-leaves short-petioled or sessile; plant not dwarf. 



Calyx sparingly long-hairy, glandular-puberulent, or glabrous, not strigose. 

 Stem-leaves deeply pinnatifld. 



Plant perennial with a rhizome. 10. A. rhizomata. 



Plant biennial, with a taproot. 4. A. violacea. 



Stem-leaves subentire, dentate or short-lobed. 



Capsules strongly ascending, straight; leaves linear or lance-linear, 



entire or nearly so, strigose beneath. 11. A. Nuttallii. 



Capsules divergent, usually curved upwards; leaves usually denticulate 



or sometimes lobed. 

 Leaves glabrous, except the margins. 



Calyx glabrous or nearly so; tips slender. 



Leaves lanceolate to linear-lanceolate. 12. A. pallida. 

 Leaves linear or very narrowly linear-oblanceolate. 



13. A. leptophylla. 



Calyx pilose; tips very short. 14. A. Vreelandii. 



Leaves pubescent on both sides. 15. A. cinerea. 



Calyx and hypanthium densely grayish strigose; leaves cinereous. 

 Leaves linear-lanceolate, deeply pinnatifid; petals rhombic. 



16. A. runcinata. 

 Leaves ovate or oblong, rarely lanceolate, dentate; petals obcordate. 



17. A. lati folia. 

 Capsules oblong; throat of the corolla hairy; leaves deeply pinnatifld. 



18. A. cor onopi folia. 



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1. A. deltoidea (Torr. & Frem.) Small. Annual or biennial; stems often 

 branched at the base, 1-3 dm. high, decumbent below; leaves petioled; blades 

 3-10 cm, long, densely canescent above, hirsute beneath; tube of the hypanthium 

 3-4 cm. long, densely hirsutulous; calyx-lobes 1.5-2.5 cm. long, hirsutulous; 

 petals 2-3 cm. long; capsule 3-4 cm. long, 2 mm. thick. Dry regions: Ariz. 

 s Utah s Calif. L. Son. Ap-Je. 



2. A. Engelmannii (Small) Woot. & Standl. Biennial; stem erect, 3-6 dm. 

 high; basal leaves petioled, 7-10 cm. long; stem-leaves sessile, lanceolate or 

 ovate, sinuately toothed, 2-4 cm. long, canescent on both sides, and hirsute on 

 the veins; tube of the hypanthium 1.5-2 cm. long, canescent and hirsutulous; 

 calyx-lobes about 1.5 cm. long, hirsute ; petals about 2 cm. long; pod 3-5 cm. long, 

 2.5-3 mm. thick. Dry places: w Tex. Utah. Son. Je-Jl. 



3. A. Buffumi A. Nels. Annual; stem erect, 2-3 dm. high, usually simple, 

 sparingly puberulent and with scattered long hairs, or nearly glabrate; basal 

 leaves petioled, 6-12 cm. long; petals about 2.5 cm. long; capsule spreading and 

 curved, 2-3 cm. long. River valleys: Wyo. Submont. Au. 



4. A. violacea A. Nels. Biennial, with a taproot; stems several, erect, 2-3 

 dm. high, violet or purple, finely puberulent or glabrous; basal leaves linear- 

 oblanceolate, entire or dentate; stem-leaves puberulent, 4-8 cm. long; tube of 

 hypanthium 2-2.5 cm. long, sparingly hairy; calyx-lobes 1.5-2 cm. long; cap- 

 sule divergent, about 3 cm. long, 2 mm. thick, usually strongly curved. Sandy 

 soil: Wyo. Colo. Plain Submont. My-Je. 



5. A. trichocalyx (Nutt.) Small. Biennial or perennial; stems erect, 1-2 

 dm. high, somewhat puberulent; leaves more or less deeply sinuate-pinnatifid, 

 cinereous and with scattered long hairs; tube of hypanthium 2-2.5 mm. long, 



