598 , ONAGRACEAE 



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

 l>Tate-pinnatifid, 4r-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; hj^anthium 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 — Submont My-Au. 



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

 tapermg mto a margined petiole, puberulent, and villous ciliate on the margins 

 and the vems, 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 fuUy as wide; capsule with rather strong 



smuate ridges, 3-4 cm. long, lance-ovoid. Hillsides: Colo.— Wyo. SubmonL— 

 Mont. Je-Au. 



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

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

 pubescent on the margins and veins, sinuately dentate; hypunthium-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. SubmonL 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-viUous, especially on the margins and the veins; hypanthium at the 

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

 ^^pout 1 cm. m diameter, sessile; ridges low and rounded, slightly if at all tubercled. 

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



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

 branchmg below groimd; leaves oblanceolate in outline, 2-4 cm. long, densely 

 hirsute, smuately 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: Ltah. Submont. Je-Au. 



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

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

 Io^St Diore or less hirsute, especially on the margins and veins, sinuate-dentate 

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

 capsule 3-4 cm. long, lance-ovoid. O. eximig, A. Gray. P. exigmis Rydb. (Fl. 

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



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

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

 viUous-hirsute, especially on the margins and veins; tube of the hypanthium 7-10 

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

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

 Colo. — Utah— Ore. Son.^SubmonL My-Jl. 



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

 tine 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.— SubmonL Je-Jl. 



13. LAVAUXIA Spach. 



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

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



