EVENING-PRIMROSE FAMILY 599 



white, pink, or yellow. Stamens 8. Hypanthium produced beyond the ovary 

 into a slightly funnelform tube. Stigmas with 4 linear lobes. Capsule short, 

 sharply 4-angled or 4-winged above, few-seeded. 



Leaves strigose-canescent. 1. L. brachycarpa. 



Leaves green, glabrous or puberulent, with ciliate margins. 2. L. flava. 



1. L. brachycarpa (A. Gray) Britton. Cespitose acaulescent perennial, 

 eanescent-strigose throughout; leaves ob lanceolate or spatulate, sinuate-pinna- 

 tifid to entire, 5-15 cm. long; tube of the hypanthium 1-1.5 dm. long, petals 

 yellow, turning rose-colored, 4-5 cm. long; capsule 15-30 mm. long, canescent. 

 Oenothera brachycarpa A. Gray. O. Howardii M. E. Jones. Plains and hills: 

 Kans. Tex. N.M. Utah. Plain Submont. My-Jl. 



2. L. flava A. Nels. Acaulescent perennial; leaves oblong-lanceolate in out- 

 line, deeply runcinate-pinnatind, 15-25 cm. long, glabrous or a little pubescent 

 on the margins; tube of hypanthium 4-7 cm. long; petals yellow, turning pink, 

 12-18 mm. long; capsule 2-3 cm. long, narrowly winged. Oenothera triloba 

 ecristata M. E. Jones. Valleys: Sask. Neb. Colo. Calif. Wash. Submont. 

 Mont. Je-Au. 



14. GAURELLA Small. SPOTTED PBIMROSE. 



Low caulescent perennials, with branching stems. Leaves alternate, entire 

 or distantly toothed. Flowers perfect, axillary, sessile. Hypanthium produced 

 beyond the ovary into a slightly funnelform tube. Sepals elongate, reflexed. 

 Petals 4, obovate, white or pink, spotted or striped with red. Style short, 

 slightly clavate; stigma with 4 linear lobes.. Capsule short, 4-angled, with a 

 short curved beak. Seeds few, angled, striate. 



1. G. canescens (Torr. & Frem.) A. Nels. Cespitose perennial; stems 1-5 

 dm. long, strongly branched, decumbent or ascending, strigose; leaves lanceolate 

 or oblong, 8-16 mm. long, repand-denticulate or entire; petals white, turning 

 pink, spotted, about 1 cm. long; capsule 8-10 mm. long, angled. Oenothera 

 canescens Torr. & Frem. O. guttulata Geyer. Prairies: Neb. Tex. N.M. 

 Colo. Plain. 



15. GALPINSIA Britton. 



Suffruticose perennials, with branched stems. Leaves alternate, narrow. 

 Flowers perfect, axillary to foliaceous bracts. Hypanthium produced beyond 

 the ovary into a more or less funnelform tube. Sepals 4, reflexed. Petals 4, 

 yellow. Stamens 8. Stigma disk-like, entire. Capsule cylindric or somewhat 

 fusiform, narrowed at the base, more or less curved. Seeds often tuberculate. 



Whole plant strigose-cinereous. 1. G. lavandulaefolia. 



Stem and hypanthium more or less hirsute. 2. G. interior. 



1. G. lavandulaefolia (T. & G.) Small. Cespitose perennial, with a woody 

 base; stems 1-2 dm. high, decumbent or ascending, canescent; leaves numerous, 

 crowded, linear or linear-spatulate, entire or nearly so, finely pubescent; hypan- 

 thium gradually dilated; tube 3-4 cm. long; petals 13-19 mm. long; capsule 

 2-2.5 cm. long. Oenothera lavandulaefolia T. & G. Plains and prairies: Neb. 

 Kans. Tex. Ariz. Wyo. Plain Son. My-Jl. 



2. G. interior Small. Cespitose perennial, with a woody base; stems 2-3 

 dm. high, hirsute as well as puberulent; leaves oblong, 1-2.5 cm. long, entire, 

 partly clasping; hypanthium elongate, gradually dilated, 2-3.5 cm. long; petals 

 1.5-2.5 cm. long; capsule 1.5-2 cm. long. Plains and prairies: Neb. Kans. 

 Tex. Plain. My-Au. 



16. MERIOLIX Raf. 



Biennial or perennial herbs, with branched stems, sometimes suffruticose at 

 the base. Leaves alternate, narrow or sharply serrate. Flowers perfect, regu- 

 lar, axillary. Hypanthium produced beyond the ovary, funnelform, the free 

 portion rather short. Sepals 4, keeled on the back. Petals yellow, often spotted 

 at the base. Stamens 8. Stigma disk-like, 4-toothed. Capsule linear, 4-angled, 

 sessile. Seeds numerous, longitudinally grooved. 



