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, 

 canescent-strigose throughout; leaves oblanceolate 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. 0. Howardii M. E. Jones. Plains and hill-: 

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



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

 line, deeply runcinate-pinnatifid, 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 PRIMROSE. 



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. 0. 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 cylinclric or somewhat 

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



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



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: hyp:in- 

 thium gradually dilated; tube 3^ 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 \ 

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

 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.- 



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 

 lar, axillary. Hypanthium produced beyond the ovary, funnelfonn. 

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

 at the base. Stamens 8. Stigma disk-like, 4-toothed. Capsule linear, -1 

 sessile. Seeds numerous, longitudinally grooved. 



