EVEXIXG.PRIMROSE FAMILY 603 



Petals 4-6 mm, long; leaves and stem sparingly hairy or glabrate. 



9. C. parvtflora. 



Leaves interruptedly pinnate, the larger alternate pairs 12 or more, not reduced. 



10. C. multijuffa, 



1. C. pterosperma (S. Wats.) Small. Stem slender, 5-10 cm. high, branched, 

 hirsute; leaves oblong-lanceolate, 1-2 cm. long, entire, hispidulous; tube of 

 hypanthium 1 mm. long; petals obcordate, rose-colored, 1.6-2 mm. long; capsule 

 cylindric-clavate, 12-18 mm. long; seeds 2 mm. long, the margms thm, incurved, 

 cellularly tuberculate. Oenothera pterosperma S. Wats. Foot-hills: Utah— CaUf, 

 Son. My-Je. 



2* C. scapoidea Nutt. Stem glabrous, 1-3 dm. high, simple or branched 

 at the base; leaves petioled, simple or pinnate, with small lateral leaflets; blade 

 or terminal leaflet ovate or elliptic, 1-4 cm. long, dentate or entire, glabrous, 

 veiny; tube of the hypanthium 2-3 mm. long; petals bright yellow, 3-o mm. 

 long; capsule 1.5-2 cm. long, 2 mm. thick. 0. scapoidea Xutt. Hills and river 

 banks : Wyo.— Colo.— Ariz.— Calif .—Ore. Son.—Submont. 



3. C. cruciformis (Kellogg) Howell Stem 2-4 dm. high, finely puberu- 

 lent or gltibrate; leaves interruptedly pinnate; leaflets 5-15, lanceolate or ovate, 

 5-4 cm. long, veiny; tube of hypanthium 4-5 mm. long; petals 7-10 mm. long; 

 capsule about 2 cm. long, 2 mm. thick. 0. cruciformis Kellogg. Dry regions: 

 Ore.— Colo.— Ariz.— Calif. Son, Mr-Je. 



4. C. brevipes (A. Gray) Small. Stem branched at the base, 2-3 dm. high, 

 usually densely w^hite-hirsute ; leaves simple, or pinnate with small lateral leaf- 

 lets; blade or terminal leaflet ovate, 3-5 cm. long, dentate, veined, hirsute; tube 

 of the hypanthium 5 mm. long; petals yellow; capsule spreading on short pedi- 

 cels. 0. brevipes A. Gray. Arid regions: s Utah— Ariz.— Calif.- A ev. bon, 



Ap-Je. 



5. C. Parryi (S. Wats.) SmaU. Stem branched, 2-3 dm. high, sparingly 

 ciliate; leaves simple, petioled; blades ovate or oblong-lanceolate, 2-5 cm. long, 

 entire or sinuate, pubescent with scattered long spreading hairs, especially on 

 the veins; free tube of hypanthium 1 mm. long; petals yellow or orange, &-7 mm. 

 long; capsule 8-12 mm. long, ascending. Clayey hills: s Utah. L. Son. 



6. C. tenuissima (M. E. Jones) Rydb. Stem much branched, 3-10 dm. 

 high- leaves mostly simple; blade lanceolate, sparmgly dentate, acute at each 

 end veiny beneath, sparingly pilose, about 1 cm. long; inflorescence racemes or 

 panicles, axiUary, with ascending-spreading branches; tube of the hypanthium 

 about 1 mm. long; petals 2-5 mm. long, yellow; capsule clavate, 4-6 mm. long, 

 on divergent pedicels. O. temdssima U. E. Jones. Barren clay soil; Utah. 



Son. S. 



7 C, Walkeri A. Nels. Stem slender, 1-2 dm. high, mmutely glandular- 



sim 



same 



length. G\T>sum hills: w Colo. Son. Jl. 



8 C venosa Nels. & Kenn. Stem 3-5 dm. high, villous, becoming gla- 

 brate in*the inflorescence; leaves 1-2 dm. long, interruptedly pinnate; terminal 

 leaflet orbicidar or ovate, 2-4 cm. long, finely canescent above,^ hirsute beneath, 

 veiny irregularly serrate; the lateral ones smaller and lanceolate; tube of hy- 



tnum z.D mm. luiig, pctu,to ^^-i^w.., v-.-^.e, ^^.^.v., « «.».- — o; --x-- - 

 long, almost glabrous. Canons and river valleys: Nev.— Utah. Son. 



um 



cm. 



Mv-Je. , - , t r 



"9 C parviflora (S, Wats.) Rydb. Annual; stem 2-3 dm. high, glabrous 

 or sparingly pubescent; leaves interruptedly pinnate, glabrous or nearly so; 

 terminal leaflet ovate, 2-4 cm. long, sharply serrate, strongly-vemed, the lateral 

 ones lanceolate, smaller; tube of hj^anthium 2 mm. long or less; petals hght yel- 

 low, 4r-Q mm. long; capsule about 3 cm. long, 2 mm. thick. 0. brevipes parviflora 

 S. Wats. Arid regions: s Utah— Ariz. L. Son. 



9 C multijuga (S. Wats.) Small. Stem branched, glabrous, 2-3 dm. 

 k;^>.* iJ™« intPrruntedlv Dumate; larger leaflets 12 pairs or more, of nearly 



N 



