124 Flora of the Paloiisc Region 



half to one-third the length of the tube: petals white or pink: 

 stamens S, the alternate ones longer; anthers attached near the 

 middle, versatile: capsule 4-celled, pyramidal, its angles retuse or 

 obtuse, transversely wrinkled; seeds sessile, in one or two rows. 

 P. caespitOSUS Raimann. Stemless or nearly so, with a thick tap-root, 

 villous throughout or nearly glabrous: leaves all radical, lanceolate or ob- 

 lanceolate, obtuse or acute, sinuately irregular-dentate or pinnatifid, 5-10 

 cm. long, narrowed into a petiole about as long: flowers barely exceeding 

 the leaves, rose-colored, 4-6 cm. broad: calyx-tube narrow, 5-10 cm. long, 

 much longer than the ovary, the lobes lanceolate, somewhat reflexed: cap- 

 sule oblong-ovate, sessile or nearly so, 3-4 cm. long. Bluffs of Snake River, 

 near Lewistou. 



202. ONAGRA. 

 Annual or biennial caulescent herbs, with mostly erect stems: 

 leaves alternate, wavy or toothed, sessile or short- petioled: buds 

 erect: flowers yellow, in terminal spikes: calyx-tube elongate, 

 terete: segments narrow: petals 4, spreading: stamens 8, equal in 

 length; anthers attached near the middle, versatile: stigma deeply 

 4-cleft, its segments linear: capsule 4-celled, 4-angled, more or less 

 tapering: seeds in two or more rows. 



0. biennis var. strigosa Piper, n. comb. (O. strigosa Ryd.: Oenothera 

 biennis var. canescemtorx & Gray.) Annual or biennial, erect, .5-2 m. 

 high, usually simple, appressed-canescent throughout: leaves numerous, 

 lanceolate or oblanceolate, acute, denticulate, 3-12 cm. long, the lower nar- 

 rowed at base into a petiole, the upper sessile: spikes terminal, elongate in 

 fruit: flowers yellow, 2-4 cm. broad, opening in the evening: calyx-tube 

 slender, 2-3 cm. long, much longer than the ovary or the spreading lobes: 

 capsules oblong, narrowed above, sessile, 2-2.5 cm. long. Sandy banks of 

 Snake River. 



203. SPHAEROSTIGMA. 

 Annual or biennial caulescent herbs: flowers usually in spikes: 

 calyx-tube obconical or shortly funnelform: stamens 8, equal in 

 length; anthers attached near the middle, versatile: stigma entire: 

 capsule 4-celled, terete or angled: seeds in one row in each cell. 



S. COntorta Walp. Slender annual, usually branched from the base, 

 10-15 cm. high, sparsely puberulent or glabrous: leaves narrowly linear, en- 

 tire or denticulate, 2-3 cm. long, sessile: flowers sessile, in the axils, some- 

 what shorter than the leaves: petals reddish-yellow, 2 mm. long, as long as 

 the reflexed calyx-lobes; capsules sessile, linear, somewhat 4-sided, usually 

 twisted or bent at the base, 2-3 cm. long. Sandy soil, Ilia. 



204. GAURA. 



Annual biennial or perennial herbs, somewhat woody at base: 

 leaves alternate, sessile: flowers white or rose-colored, in spikes or 

 racemes: calyx-tube much prolonged beyond the ovary, 4-lobed, 

 rarely 3-lobed: petals 4, with claws turned up: stamens mostly 8, 

 turned down: fruit hard and nut-like, 3-4-ribbed or angled, inde- 

 hiscent or nearly so, usually i-celled and 1 4-seeded. 



