E^-EXIXG-PRIMROSE FA:mILY 595 



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



acute: capsule reflexed. if A. deltoidea. 



Blades of the lower leaves spatula te, sinuate or round-lobed, obtiise; cap- 

 sules divergent. 2. A. Engelmannii. 

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



Leaf-blades linear or the lower Unear-oblanceolate, sinuatelv dentate; 



calyx with a few long hairs. 3. .4. Buffumi. 



Leaf-blades oblanceolate or oblong in outUne, sinuat«ly pitmatifld, with oblong 

 lobes: calyx densely silky callous. 4. A. violacea. 



Capsule erect or ascending. 



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



5. .-1. trichocalyx. 

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



Branches erect: petals 1.5-2 cm. long. 6. A. perplexa. 



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

 _^ , 7. A. albicaulis. 



Pnibescence wholly cinereotis-strigose. 8. A. Bradburiana. 



Calyx in bud acuminate or acute; tips free. 



Capsule Unear-cyhndric: throat of the coroUa glabrous. 



Leaves aUIong-petioled, oblanceolate, subentire; plant dwarf. 9. A. simplex. 

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



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

 Stem-leaves deeply pinnatifid. 



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



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



Stem-leaves subentire, dentate or short-lobed. 



Capsules strongly ascending, straight: leaves Unear or lance-Unear, 



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



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 narrowlj- Unear-oblanceolate. 



13. A. leptophylla. 

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



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



Calj-x and hj-panthium densely grajish strigose; leaves cinereous. 

 Leaves hnear-lanceolate, deeply pinnatifid; petals rhombic. 



16. A. Tuncinata. 

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



17. A. lalifolia. 

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



IS. A. coTonopi folia. 



1. A. deltoidea (Yovv. & 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; cal\-x-lobes 1.5-2.5 cm. long, hirsutulous; 

 petals 2-3 cm. long; capsule 3^ cm. long, 2 mm. thick. Dry regions; Ariz. — 

 s Utah — s Calif. L. Son. Ap-Je. 



2. A. Engelmannii (SmallJ Woot. & Standi. 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 h>-panthium 1.5-2 cm. long, canescent and hirsutulous; 

 cah-x-lobes about 1.5 cm. long, hirsute ; pvetals about 2 cm. long; pod 3-5 cm. long, 

 2.5-3 mm. thick. Dr\- places: w Tex. — Utah. So7i. Je-Jl. 



3. A. Buflfumi A. Xels. 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. Subtnont. Au. 



4. A. violacea A. Xels. 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-S cm. long; tube of 

 hj-panthium 2-2.5 cm. long,' sparingly hairy; cah-x-lobes 1.5-2 cm. long; cap- 

 sule divergent, about 3 cm. long, 2 mm. thick, usuaUv strongly curved. Sandj- 

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



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

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

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



