EVENING-PRIMROSE FAMILY 591 



Seeds glabrous. 



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



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



Petals 1-3 mm. long. 4 " G " 



Plant pubescent with spreading hairs. 5 G caesium 



Plant glabrous throughout or the young capsules strigillose. 



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



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 reflexed. 7. G. ramosissimum. 



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



the pedicels, and erect. 8. G. Nuttallii 



Capsules neither torulose nor clavate; pedicel very short. 



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



Capsules broader, flattened contrary to the septum, with oblique seeds. 



10. G. pumilum. 



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

 brous; leaves narrowly linear, 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 Calif. Plain Submont. 

 Je-Au. 



3. G. Helleri Rydb. Stem 1-3 dm. high; leaves linear, 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 Calif. Wash. Submont. 



Mont. Je-Au. 



6. 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 Calif. Wash. Son. Submont. Je-Au. 



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

 peeling bark, profusely 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 reflexed. Sandy 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 slightly strigose above; leaves linear, 2-4 cm. long, usually glabrous; 

 sepals and petals mostly 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 



