59S OXAGRACEAE 



2. P. Johnsoni Parn,- Rydb. Cespitose jjerennial, acaulescent; leaves 

 hTate-pinnatind. 4-7 cm. long, short -pubescent : terminal lobe oval or ovate, 

 dentate-crenate, about 2 cm. long: larger lateral lobes &-S mm. long, oblong, the 

 smaller ones deltoid: h>-panthium about 3 cm. long, sparingly pilose: petals 1.5-2 

 cm. long: capstile sessile, lance-oblong, about 2 cm. long, with a double row of 

 strongly tuberculate ridges on each angle. O. Johnsoni Parr>\ Dr\- regions: 

 s Utah — s Calif. Son. 



3. P. montaiius (Nutt.) A. Xels. Cespitose. acaulescent perennial: leaves 

 shon-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. O. moniana Xutt. Dn." hills: Sask. — ^Xeb. — Colo. — Xev. — Ida. 

 Plain — Submont. My-Au. 



4. P. macroglottis Rydb. Acaulescent or nearly so: leaves S-15 cm. long, 

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

 and the veins, very thin : tube of hj-panthium gradually widening into a fuimel- 

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

 cm. long: petals about 3.5 cm. long, and ftilly as wide: cap>stile with rather strong 

 sinuate ridges. 3— i cm. long, lance-ovoid. Hill s ides: Colo. — Wvo. Submont. — 

 Mont. J^Au. 



5. P. caiilescens 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: h>-panthium-tube about 

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

 obovate: fxxi 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 pereimial: leaves 

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

 hirsute-villous. especially on the margins and the veins: h^-panthium at the 

 throat 1-1.5 cm. wide: sep^ 3-4 cm. long: capsule 4-5 cm. long, lance-ovoid, 

 about 1 cm. in di am eter, sessile: ridges low and rounded, shghtly if at all tubercled. 

 Hillsides: Wyo. — X.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 IS mm. long, - 

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

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

 places: Utah. Submont. Je-Au. I 



8. P. eyimitis (A. Gray) Woot. & Standi. Caulescent perennial: stem i. 

 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 h].-panthimn 1-1.5 dm. long, hirsute: petals 2.5—4 cm. long; 

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

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



9. P. marginatus Xutt. ' Rydb. Cespitose acaulescent or short-stemmed 

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

 villous-hirsute, especially on the Tn^rgin-; and veins: tube of the h>-panthium 7-10 

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

 on the angles. O. margiruita Xutt. O. idahoen.?is 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 h\-panthium .5-S cm. long, canescent: petals 2— i cm. long; 

 capsule 2-3 cm. long, lance-ovoid, canescent, strongly tubercled. T>ry h il ls and 

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



13. LAVAUXIA .Spach. 



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

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



