EVENING-PRIMROSE FAMILY 601 



Plant taller, 1-4 dm. high, often viscid above; capsule about 5 cm. Iqn^. 



Petals 5-6 mm. long. 12 S alyssoides 



Corolla wliite to ocliroleucous or rose-colored. 



Capsule enlarged at the base, taperin*? upwards; bark shreddy. 



Plant gla)>rous; leaf-blades oblanceolate. 2. S. decoriicans 



Plant more or less p^landidar; leaf-blades ovate. 3. 5. Boothii 



Capsule scarcely enlarged at the base, cylindric; plant pubescent; bark not shre<ldy 

 Plant stngose or puberulent. 



Leaves linear. 7. s. refractum. 



ijeaves elliptic, spatulate or lanceolate. 



Petals 1-2 mm. long. 10. s. torlum. 



T., . Petals 5-6 mm. long. 12. 5. alyssoides. 



Plant villous. 



Leaf-blades 3-5 cm. long, obovate, sparsely villous; petals 7-8 mm. long. 



T ^ , , , l*^- -S. niacrophullum. 



Leaf-blades 1-2.5 cm. long, densely villous; petals 3-5 mm. long. 



14. 5. utahense. 



1. S. andinum (Nutt.) Walp. Small annual; stem 3-10 cm. high, branched, 

 canescent-puberulent; leaves linear or linear-oblanceolate, 1-3 cm. long, entire, 

 more or less strigose; flowers minute, numerous; tube of the hypanthium less 

 than 1 mm. long; petals about 1 mm. long; capsule 6-7 mm. long, canescent. 

 Oenothera andina Nutt. Hills: Sask. — Wyo.— Utah— Calif.— Wash. Son, — 

 Submonf. My-JL 



2. S. decorticans (H. & A.) Small. Originally described as perennial, but 

 apparently only biennial or annual; stem 2-4 dm. high, sparingly branched, gla- 

 brous, somewhat gland idar-puberulent in the inflorescence; leaves lanceolate or 

 oblanceolate, 2-6 cm. long, entire or denticidate; tube of the hypanthimn about 



4 mm. long; petals white or cream-colored, turning pink, 3^ mm. long; capsule 

 about 2 cm. long, 2 mm. thick, more or less cur^^ed and tAnsted. Gaura decorti- 

 cans H. & A. O, gauriflora T. & G. Sandy places: s Utah— Ariz.— Calif . ' 

 Son. — SubmonL Ap-Je. 



3. S. Boothii (Dougl.) Walp. Annual; stem in age glabrate, shining, with 

 white shreddy bark; leaves petioled; blades ovate, dentate, acute or acuminate, 

 glabrous above or nearly so, hirsute beneath, 2-3 cm. long; tube of hypanthium 



5 mm. long, glandular-pubescent; petals 4-5 mm. long; capsule 1-1.5 cm, long, 

 1.5-2 mm. thick at the base. O. Boothii Dougl. Gravelly hills: Wash.— Ida. 

 — Nev. — Calif. So7i, Je. 



4. S. parvulum (Nutt.) Walp. Slender annual; stem 5-10 cm. long, branched; 

 leaves narrowly linear, almost fihform, entire, 1-3 cm. long, less than 1 mm. wide; 

 tube of hypanthium 1.5 mm. long; petals 2-3 mm. long; capsule hnear-cvlindric, 

 2-2.5 mm. long, 1 mm. thick, erect, straight, glabrous. O. parvnia Nutt/ Sandy 

 plains and rocky hiUs: Wyo. — Utah— Ida. Son. — SuhmonL My-Je. 



5. S. flexuosum A. Nels. Small annual; stem 1 dm. high or less, with few 

 branches; leaves narrowly linear, entire, 2-3 cm. long, about 1 mm. ^ide; tube 

 of hypanthium 1.5 mm. long; capsules hnear-c3dindric, 2-3 cm. long, S-curv^ed. 

 S. contortum flexuosum A. Nels. Dry soil: Wyo. — Utah. Son. Je. 



6. S. strigulosum Fisch. & Me3^ Annual; stem 1-3 dm. high, branched 

 near the base, with spreading or ascending branches; leaves linear or oblong, 

 1-3 cm. long, 1-3 mm. wide, in depauperate specimens narrow and subentire; 

 tube of hypanthium 2 mm. long; petals 3-4 mm. long; capsule linear-cvlindric, 

 1 mm. thick, 2-3 cm. long, ascending, only slightly cin-ved. O. strigidosa^T. & G. 

 Sandy places: B.C. — Ida. — Calif. Son. My-JL 



7. S. refractum (S. Wats.) Small. Annual; stem erect, diifusely branched, 

 2-4 dm. high, somexvhat glandular-puberulent; leaves linear or narrowly linear- 

 lanceolate, 2-5 cm. long; tube of the hypanthium about 4 mm. long; petals 

 cream-colored, 5-6 mm. long; capsule slender, 2-3 cm. long, more or less twisted, 

 abruptly reflexed. 0. refracia S. Wats. Arid regions: s Utah — Ariz. Son, 



8. S. pubens (S. Wats.) Rydb. Annual; stem 1-3 dm. high; leaves linear, 

 entire or rarely minutely denticulate, 1-3 em. long, 1-2 mm. vdde; tube of hy- 

 panthium 1-1.5 mm. long; corolla 3-4 mm. long; capsule linear-cylindric, 2-3 

 cm. long, 1 mm. thick, spreading at the base, arching upwards. (?) S. fiUforme 

 A. Nels. Dr>^ places: Ida. — w Colo. — Ariz. — Calif. — B.G. Son. My-Jl. 



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