164 ONAGRACEAE 



Capsule divergent or reflexed. 



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



Blades of all the leaves deltoid-lanceolate, sinuite-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 sUky villous. 4. A. violacea. 



Capsule erect or ascending. 



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



5. A. Irichocalyx. 

 Seeds ovoid, ridged and tubercled, rather blunt 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. 

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



Calyx in bud acimiinate or acute; tips free. 



Capsule Unear-cylindric; throat of the corolla glabrous. 



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

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



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

 Stem-leaves deeply pinnatiM. 



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



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. NuttallU. 



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 pinnatifld; petals rhombic. 



16. A. runcinata. 

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



17. A. latifoHa. 

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



18. A. coronopifoUa. 



12. PACHYLOPHUS Spach. Rock Rose, Mountain Primrose. 



Plant glabrous, or nearly so. 1. P. caespitosum ■ 



Plant hairy. 



Plant not canescent-strigose. 



Leaves lyrate-pinnatifld; apex and lobes rounded or obtuse ; hairs with pustulate 



bases. 2. P. Johnsoni. 



Leaves sinuately lobed or toothed, acute; hairs not pustidate at the bases. 



Hypanthium, calyx, and fruit glabrous, slightly strigose or with a few scattered 

 long hairs. 

 Tube of the hypanthium 3-6 cm. long; pubescence short and usually ap- 



pressed. 3. P. monlanus. 



Tube of hypanthium 6-12 mm. long. 



Plant acaulescent, cespitose; pod short, conic-ovoid, with very thick 



ridges. 4. P. macroglottis. 



Plant uiore or less caulescent; pod elongate, conic-ovoid, with low ridges. 



5. P. caulescens. 

 Hypanthiimi, calyx, and fruit densely hirsute. 



Fruit subsessile, conic-ovoid, obtuse at the base. 



Plant acaulescent: ridges of the fruit slightly tuberculate. 



Hypanthium 8-12 cm. long; petals 3— 4 cm. long. 6. P. hirsutus. 

 Hypanthium about 5 cm. long; petals about 2 cm. long. 



7. P. crinitus. 

 Plant more or less caulescent; ridges of the fruit with lobed, more or 

 less fohaceous crests. 8. P. eximius. 



Fruit more or less stipitate, fusiform, tapering at both ends, with slightly 

 tuberculate ridges; plant often more or less caulescent. 9. P. marginatus. 

 Plant densely canescent-strigose throughout. 10. P. canescens. 



13. LAVAUXIA Spach. 



Leaves strigose-canesceut. 1. L. brachycarpa. 



Leaves green, glabrous or puberulent, with ciliate margins. 2. L. flava. 



14. GAURELLA Small. Spotted Primrose. l. G. canescens. 



