EVENING-PRIMROSE FAMILY 591 



Seeds glabrous. 



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

 cUivate. 

 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 tliroughout or the young capsules strigillose. 



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



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



Petals about 1 mm. long, rose or white. 



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

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



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

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



Capsules neither torulose nor clavate; pedicel very short. 



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



Capsules broader, flattened contrary to the septiom, with obUque seeds. 



10. G. pumilum. 



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

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

 3^ 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 narrowly linear, 

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

 colored; capsules erect, slightly 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 hnear, 0.5-2 cm. long, 

 softly hirsutulous; pedicels very 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. — Wyo. — Calif. Submont. 

 Je-Jl. 



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

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

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

 usually erect. Sandy places: Mont. — Wyo. — 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, torylose, 8-10 mm. long; erect, short-pedicelled. Sandy places: Mont. 

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



6. G. intermedium Rydb. Stem white and shining, with more or less 

 peeling bark, profu.sely branched, 3-7 dm. high, erect; leaves linear or nearly so, 

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

 torulose, somewhat strigose when young. Sandy soil: Mont. — 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. Sandv places and on hillsides: 

 Mont.— S.D.— Colo.— Ariz.— Calif.— B.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 

 2-4 mm. long. Sandy or dry soil, 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 sligiitly strigose above; leaves hnear, 2-4 cm. long, usually glabrous; 

 sepals and i)etals mostly less than 1 mm. long; capsule narrowly linear, 1-1.5 

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

 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 



