E\^NING-PRLMROSE FAMILY 591 



Seeds glabrous. 



Capsules torulose, less than three times as long as the pedicels, usually more or less 

 clavate. 

 Petals 3-6 mm. long; capsules scarcely longer than the pedicels. 



4. G. diffusum. 

 Petals 1-3 mm. long. 



Plant pubescent with spreading hairs. 5. G. caesium. 



Plant glabrous throughout or the i'oung capsules strigUlose. 



Petals 1.5-2.5 mm. long, rose with yeUow base; capsules 8-12 mm. long, 



nearly twice as long as the pedicels. 6. G. inleTmedium. 



Petals about 1 mm. long, rose or white. 



Capsules decidedly clavate, rounded at the apex, seldom longer than 

 the pedicels, spreading or reliexed. 7. G. ramosissimum. 



Capsules only sUghtly if at all clavate, narrow, usually longer than 

 the pedicels, and erect. 8. G. Xuttallii. 



Capsules neither toriilose nor clavate; pedicel very short. 



Capsules narrow, scarcely flattened, with suberect seeds. 9. G. racemosum. 



Capsules broader, flattened contrary to the septmn, with obhque seeds. 



10. G. pumilum. 



1. G. eriospermum Coville. Stem 3-5 dm. high, -n-idety branched, gla- 

 brous; leaves narrowly linear, 3-5 cm. long; pedicels 5-10 mm. long, erect; sepals 

 3—1 mm. long, strigose; petals rose-colored in age; capsule strigose, erect, about 

 1 cm. long, torulose, 8-10-seeded. Sandy soil: Ore. — Ida. — Calif. Son. Jl-S. 



2. G. lasiospermum Greene. Stem 3-6 dm. high; leaves narrowh- linear, 

 1-3 cm. long; pedicels erect, 2-4 mm. long; petals white, often turning rose- 

 colored; capsules erect, shghtly clavate, scarcely torulose, glabrous or strigillose, 

 6-10 mm. long. Sandy soil: Wash. — Mont. — Utah — Cahf. Plain — Submont. 

 Je-Au. 



3. G. Helleri Rydb. Stem 1-3 dm. high; leaves Linear, 0.5-2 cm. long, 

 softly liirsutulous; pedicels verj- short, even in fruit scarcely more than 1 mm. 

 long; petals scarcely 1 mm. long; capsules Linear, erect, 8-10 mm. long, almost 

 sessile, hirsutulous, not torulose. Sandy places: Ida. — Wj'o.— Calif. Submont. 

 J^Jl. 



4. G. difEusum T. & G. Stem dichotomously branched, 3-6 dm. high, 

 glabrous or nearly so; leaves linear, 2-6 cm. long, glabrous, or strigiUose when 

 young; sepals about 2 mm. long; capsule clavate, torulose, 5-10 mm. long, 

 usually erect. Sandy places: ^lont. — W3'o. — Utah — Cahf. — Wash. Submont. 

 — Mont. Je-Au. 



5. G. caesium T. & G. Stem 1-5 dm. high; branched; leaves linear or nar- 

 rowly linear-oblanceolate, 2-5 cm. long, sepals and petals 1-2 mm. long; capsule 

 clavate, torulose, 8-10 mm. long; erect, short-pedicelled. Sandy places: ]Mont. 

 — Wyo. — Utah — Cahf. — -Wash. Son. — Submont. Je-Au. 



6. G. intermedium Rj-db. Stem white and shining, with more or less 

 peeling bark, profusely branched, 3-7 dm. high, erect; leaves Linear or nearh- so, 

 light green; sepals about 1.5 mm. long, yeUowish; capsule somewhat clavate and 

 torulose, somewhat strigose when j-oung. Sandy soil: ^lont. — Colo. — Calif. — 

 Wash. Submont. — Mont. Jl-Au. 



7. G. ramosissimum T. & G. Stem diffusely branched, 3-6 dm. high; 

 leaves linear, 2—4 cm. long; petals white or rose-colored; capsule 3-8 mm. long, 

 decidedly torulose, spreading or usually refiexed. Sand}' places and on hillsides: 

 Mont. — S.D. — Colo. — Ariz. — Cahf.— I^.C. Submont. — Mont. My-Au. 



8. G. Nuttallii T. & G. Stem 2-5 dm. high, glabrous, branched; leaves 

 1-3 cm. long, acute; capsule linear, 7-15 mm. long, somewhat torulose; pedicels 

 2^ mm. long. Sandy or dry soU, hillsides, etc.: S.D. — Colo. — Ariz. — Calif. — 

 Wash. Submont. Jl-S. 



9. G. racemosum. T. & G. Stem 1-3 dm. high, more or less • branched, 

 glabrous or slightly strigose above; leaves hnear, 2—4 cm. long, usually glabrous; 

 sepals and petals mosth' less than 1 mm. long; capsule narrowly linear, 1-1.5 

 cm. long, glabrous, erect, almost sessile. Sandy soil: S.D. — Colo. — Calif. — 

 Wash. Submont. — Subalp. Je-Au. 



10. G. pumilum S. Wats. Stem 1-2 dm. high, glabrous or nearly so, 

 simple or branched at the base; leaves narrowly linear-oblanceolate, acute, 2-4 



