Gaura. ONAGRACE^. 



233 



11. BOISDUVALIA, Spach. 

 Calyx-tube funnclform above the ovary, deciduous; the lobes erect. Petals 4, 

 obovate-cuneiform, sessile, 2-lobed, purple to white. Stamens 8, tliose opposite to 

 the petals shorter ; lilaments very slender, naked at base ; antliers all perfect, ob- 

 long, attached near their base. Ovary 4-celled, several-ovuled : style filiform : 

 stigma-lobes short, somewhat cuneate. Capsule membranaceous, ovate-oblong to 

 linear, iioavly toroto, acute, aossilc, dehiscent to the base. Seeds ascending, few 

 (3 to 8) in one row in each cell, ovatc-ohlong, somewhat angled, smooth. — Erect 

 leafy annuals; leaves alternate, scssih^ simple; flowers small, in leafy simple or 

 compound spikes. — Oenothera § Boisduvalia, Torr. Si Gray, Fl. i. 505 ; Watson, 

 Proc. Am. Acad. viii. GOO. 



A smaU genus confined to Western America, there being two Chilian species in addition to the 

 following. 



1. B. densiflora, Watson. Canescently pubescent and more or less villous, 

 often stout, | to 2 feet high : leaves lanceolate to linear-lanceolate, acuminate, 

 mostly denticulate, 1 to 3 inches long ; tlie floral leaves usually much shorter and 

 broader : flowers in a usually close terminal spike or numerous short lateral spike- 

 lets : calyx 1 ^ to 3 lines long, about half the length of tlie petals : capsules ovate- 

 oblong, smooth or slightly villous, 2 to 4 lines long; cells 3-G-seeded, the parti- 

 tions wholly separating from the valves and adherent to tlie placenta : seeds nearly 

 or quite a line long. — OCnothera densifora, Lindl. Bot. Keg. t. 1593. Boisduvalia 

 Dovglasii, Spach, Monog. Onagr. 80, t. 31, fig. 2. 



From Washington Territory to Monterey {Nnttall), near Fort Tejon (Rothrock), aTid in the 

 foot-hills of the Sierra Nevada to Tuolumne County : near Carson City, Anderson. Very 

 variable. 



2. B. Torreyi, Watson. Villous tliroughout with short stifTish spreading hairs, 

 rather slender, a span or two high : leaves linear to lanceolate, usually narrow at 

 ])ase, entire or somewhat denticulate, 4 to 9 lines long ; the floral leaves similar 

 and scarcely smaller: flowers in a loose simple spike, very small (a line or two 

 hmg), purplish : capsules linear, acuminate, 4 to G lines long; cells G-8-seeded, 

 the partitions adiieront to the valves : hcwIs more ovate and smaHer, half a lino 

 long or less. — (^nnopht/lmn stn'dim, CJray, Pi'oc. Am. Acad. vii. 340. (JCnothera 

 Torre j/i, Watson, 1. c, 



Oregon (RaU) and southward in the Coast Ranges ; New Ahnaden, Tmrcy. 



3. B. glabella, Walpers. Glabrous or slightly pubescent, slender, a foot high : 

 leaves ovate to oblong-lanceolate, acute, serrate, a half to m\ inch long ; the floral 

 bracts scarcely smaller : flowers in a simple sjiike, shorter than the leaves : petals 

 deep purple, less than a line long : capsules ovato-o])long, 2 to 4 lines long ; parti- 

 tions adherent to the valves : seeds 4 to G in each cell, linear-lanceolate, a lino long. 

 — (Enothera glabella, Nutt. ; Torr. k Gray, Fl. i. 505. 



Valley of the Columbia {Nuttall, Hall) ; Truckee and Carson River valleys, Nevada, BaiUy, 

 Watson. 



12. GAURA, Linn. 

 Calyx-tube prolonged beyond the obconic or clavate ovary ; the 4-parted limb 

 deciduous. Petals 4, with claws. Stamens 8, nearly equal ; fdaments furnished 

 with a Hcalo-likn iippendage on tlio itiside next tlm basc^ ; authors oval, vcirHatilo. 

 Ovary 4-celled : ovules 1 to 2 in each cell, pendulous : stylo filiform, hairy bo- 

 low : stigma 4-lobed, surrounded by an obseun^ ring or imlusium. Kriiil. init-liko, 

 indchiscent or splitting at the apex, obtusely 4-nngled ami ridged ujum the sides. — 



