(Enothera. ONAGRACEjE. 223 



Canescently puberulent, slender : leaves nearly entire : capsule 



very slender, not attenuate upward. 17. (E. ALTSSOIDES. 



Viscidly pubescent : leaves denticulate : capsule attenuate from 



the base. IS. (E. Boothii. 



Glabrous : stem white and shining : spike nearly erect : capsule 



attenuate from the base. 19. CE. gaur.eflora. 



* * * * Capsule pedicellate, linear or somewhat clavate, obtuse, not contorted : otherwise as 



in the preceding. 

 Flowers in a nearly naked raceme : calyx-tube funnelfomi. 

 Leaves all near the base, usually lvr.it. -. 



Puberulent or nearly glabrous : calyx-tips not free : capsule an 



inch long or less. 20. <E. scapotdea. 



Villous : calyx-tips free, stout : capsule 1 to 3 inches long. 21. CE. brevipes. 



Leaves scattered, cordate or ovate : calyx-tube long-funnelform ; 



tips not free. 22. CE. cardiophyxla. 



Flowers with leafy bracts, very small : calyx-tube obconic : seeds 



with involute margins : dwarf, slender. 23. CE. rTEROSPF.RMA. 



§ 1. Calyx much prolonged beyond the ovary : stamens nearly equal; anthers linear 

 or linear-oblong : stigma-lobes linear: capsnle coriaceous. — EucENOTHERA. 



* Tall, erect: flowers yellow, in a leafy spike, erect in the bud, opening at evening : 

 tips of the calyx-lobes free : capsule narrowly oblong, sessile, straight : seeds in 2 

 rows in each cell. — Evening Primrose. 



1. CE. biennis, Linn. Biennial, stout and usually simple, 1 to 5 feet high, 

 canescently puberulent and more or less hirsute : leaves lanceolate to oblong- or 

 rarely ovate-lanceolate, acute or acuminate, 2 to 6 inches long, repandly denticulate, 

 mostly sessile : calyx-tube 1 to 21 inches long : petals 6 to 9 lines long : capsule 

 about an inch long or less : seeds oblong, with somewhat margined angles. 



Var. grandiflora, Lindl. Petals as long as the calyx-tube : capsule more or 

 less pubescent. — Bot. Peg. t. 1604. <Ji. grandiflora, Ait. ; Bot. Mag. t. 2068. 



Var. hirsutissima, Gray. Flowers as in the last, but the ovary especially more 

 hirsute. — PL Bjendl. 43. CE. Hookeri, Torr. & Gray, PL i. 493. 



From Oregon to the Atlantic and from British America to Mexico ; forms of it are also widely 

 naturalized in Europe (where it has long been cultivated), as well as in S. Africa, India, and 

 Australia. The var. hirsutissima is the more common form in California, ranging to New Mi icico, 

 the others being more prevalent east of the Sierra Nevada. 



* * Usually low : stems white : flowers large, white becoming pinkish., axillary, nod- 

 ding in bud, ripening by day: capsules long and narrow, sessile, often curved: seeds 



in a single row in each cell, //sending. 



2. CE. albicauliS, Nutt. Glabrous or puberulent : stems herbaceous, from a 

 perennial subterranean running rootstock, erect, ! to 1 feet high, simple or branched : 

 leaves linear to oblong-lanceolate, sessile or attenuate at base or abruptly petioled, 

 entire or repand-denticulate or sinuate-pinnatifid toward the base, 1 to 3 inches 

 long : tips of the calyx-lobes free in the bud ; the tube an inch long or less : petals 

 about tis long as the tube, entire or emarginate : capsule an inch or two long, not 

 broader at base: seeds narrowly oblong, terete, a line long. Engelm. in Am. Jour. 

 Sci. 2-ser. xxxiv. 334. IE. pallida, I lougl. ; Lindl. lint. Keg. t. 1142. 



A variable species, common eastward of the sierra Nevada, ranging I'mm Washington Territory 

 to the Saskatchewan and southward to the Mexican boundary. 



3. CE. Californica, Watson. Hoary-pubescent and more or less villous: 



herbai. is Brora a running rootstock, decumbent, about a span long : leaves narrowly 



oblanceolate, acuminate, mostly petioled, sinuatelj toothed or irregularly pinnatifid, 

 2 to 1 inches long: flowers as in the last but often larger; the ovary and calyx vil- 

 lous, and the petals lobed with a rounded sinus: capsule 2 inches long, uoi thick- 

 ened at base: seeds oblong, turgid, somewhat obtuselj angled. - (E. albicaulis, var. 

 Californica, Watson, Proc Am. Acad. viii. 582. 



