598 ONAGRACEAE 



2. P. Johnsoni (Parry) Rydb. Cespitose perennial, acaulescent; leaves 

 lyrate-pinnatifid, 4-7 cm. long, short-pubescent; terminal lobe oval or ovate, 

 dentate-crenate, about 2 cm. long; larger lateral lobes 6-8 mm. long, oblong, the 

 smaller ones deltoid; hypanthium about 3 cm. long, sparingly pilose; petals 1.5-2 

 cm. long; capsule sessile, lance-oblong, about 2 cm. long, with a double row of 

 strongly tuberculate ridges on each angle. O. Johnsoni Parry. Dry regions: 

 s Utah — s Calif. Son. 



3. P. montanus (Nutt.) A. Nels. Cespitose, acaulescent perennial; leaves 

 short-petioled, 5-10 cm. long; leaf-blades oblanceolate, coarsely sinuate-toothed, 

 canescent-pubescent on the margins, otherwise glabrous or sparingly strigose; 

 petals 2-3 cm. long; capsule sessile, ovoid, obtusely tubercled on the blunt angles, 

 2 cm. long. 0. montana Nutt. Dry hills: Sask. — Neb. — Colo.— Nev. — ^Ida. 

 Plain — Subniont. My-Au. 



4. P. macroglottis Rydb. Acaulescent or nearly so; leaves 8-15 era. long, 

 tapering into a margined petiole, puberulent, and villous ciliate on the margins 

 and the veins, very thin; tube of hypanthium gradually widening into a funnel- 

 form throat, 1 cm. in diameter; sepals lanceolate, gradually long-acuminate, 3-5 

 cm. long; petals about 3.5 cm. long, and fully as wide; capsule with rather strong 

 sinuate ridges, 3-4 cm. long, lance-ovoid. Hillsides: Colo. — Wyo. Subtnont. — 

 Mont. Je-Au. 



5. P. caulescens Rydb. More or less caulescent perennial; stem 1-2 dm. 

 high, angled; leaves with the long petioles about 2 dm. long, about 3 cm. wide, 

 pubescent on the margins and veins, sinuately dentate; hypanthium-tube about 

 9 cm. long, glabrous, at the throat nearly 1.5 cm. wide; petals about 2.5 cm. long, 

 obovate; pod sessile, about 3 cm. long, lance-ovoid, with rounded low ridges. 

 Hillsides and river banks: Colo. Submont. My-Je. 



6. P. hirsutus Rydb. Cespitose, almost acaulescent perennial; leaves 

 oblanceolate, 1-2 dm. long, more or less petioled, runcinately lobed or divided, 

 hirsute-villous, especially on the margins and the veins; hypanthium at the 

 throat 1-1.5 cm. wide; sepals 3-4 cm. long; capsule 4-5 cm. long, lance-ovoid, 

 about 1 cm. in diameter, sessile; ridges low and rounded, slightly if at all tubercled. 

 Hillsides: Wyo. — N.M. — Utah. Submont. — Mont. 



7. P. crinitus Rydb. Strongly cespitose, acaulescent perennial, the caudex 

 branching below ground; leaves oblanceolate in outline, 2-4 cm. long, densely 

 hirsute, sinuately toothed, acute; sepals linear-lanceolate, about 18 mm. long, 

 densely pilose; petals obcordate, 2 cm. long, or a little more; pod (not fully de- 

 veloped), sessile, ovoid, scarcely tubercled on the ridges, densely hairy. Dry 

 places: Utah. Submont. Je-Au. 



8. P. eximius (A. Gray) Woot. & Standi. Caulescent perennial; stem 

 stout, 1-3 dm. high, leafy; leaves oblanceolate or spatulate in outline, 1-2 dm. 

 long, more or less hirsute, especially on the margins and veins, sinuate-dentate 

 or lobed; tube of hypanthium 1-1.5 dm. long, hirsute; petals 2.5-4 cm. long; 

 capsule 3-4 cm. long, lance-ovoid. 0. eximia A. Gray. P. exiguus Rydb. (Fl. 

 Colo., misprint). Hills and banks: S.D. — N.M. Plain — Submont. Je-Au. 



9. P. marginatus (Nutt.) Rydb. Cespitose acaulescent or short-stemmed 

 perennial; leaves oblanceolate, sinuate-dentate, or runcinate, 1-1.5 dm. long, 

 villous-hirsute. especially on the margins and veins; tube of the hypantliimn 7-10 

 cm. long; petals 3-4 cm. long; pod 3-4 cm. long, with rather prominent tubercles 

 on the angles. 0. marginata Nutt. 0. idahoensis Mulford. On hills: Ida. — 

 Colo. — Utah — Ore. Son.— Submont. My-Jl. 



10. P. canescens Piper. Acaulescent cespitose perennial, canescent with 

 fine appressed pubescence; leaves pale green, oblanceolate, sinuate-dentate or 

 subentire; tube of hypanthium 5-8 cm. long, canescent; petals 2-4 cm. long; 

 capsule 2-3 cm. long, lance-ovoid, canescent, strongly tubercled. Dry hills and 

 bench-lands: Mont. — w Neb. — Calif. — Wash. Son. — Submont. Je-Jl. 



13. LAVAUXIA Spach. 



Perennial or annual, mostly acaulescent herbs. Leaves mostly basal, numer- 

 ous, pinnatifid or lobed. Flowers few, axillary. Sepals narrow, reflexed. Petals 



