190 ONAGRACE^E. (EVENING-PRIMROSE FAMILY.) 



to winged petioles, not revolute ; seeds often only slightly roughened, short 

 and shortly appendaged. (E. alpinum, Man.) White Mts., dells of the Wis- 

 consin River (Laphatii), and northward. (Eu.) 



10. E. pallistre, L. Slender, 1 high or less, often branched, finely pu- 

 bescent; leaves erect or ascending, about equalling or longer than the inter- 

 nodes, sessile, linear to linear-lanceolate or elliptic-oblong, obtuse, with revolute 

 margins ; capsules pubescent to nearly glabrous, mostly shorter than the slen- 

 der peduncles ; seeds fusiform, with long beak. ( E. palustre, var. lineare, Man., 

 in part.) Penn. to Minn, and the White Mts., north and westward. (Eu.) 



4. CENOTHERA, L. EVENING PRIMROSE. 



Calyx-tube prolonged beyond the ovary, deciduous ; the lobes 4, reflexed. 

 Petals 4. Stamens 8 ; anthers mostly linear and versatile. Capsule 4-valved, 

 many -seeded. Seeds naked. Leaves alternate. Flowers yellow, white or 

 rose-color. (An old name, of unknown meaning, for a species of Epilobium.) 

 1. Stigma-lobes linear, elongated (except in n. 7); calyx-tube linear, slightly 



dilated at the throat ; anthers linear. 

 * Caulescent annuals or biennials ; /lowers erect in the bud, nocturnal, yellow, the 



calyx-tips free ; capsules sessile, coriaceous ; seeds in two rows in each cell. 



>- Flowers in a leafy spike ; capsules stout, oblong, slightly narrowed above. 



1. CE. bi6nnis, L. (COMMON EVENING PRIMROSE.) Rather stout, erect 

 (1 - 5 high), usually simple, more or less pubescent and hairy; leaves lanceolate 

 to oblong- or rarely ovate-lanceolate (2 - 6' long), acute or acuminate, repandly 

 denticulate, the lowest petioled ; calyx-tube 1 - 2^' long, the tips of the sepals 

 contiguous ; petals - f ' long ; capsule more or less pubescent or hirsute. 

 Throughout the U. S. Var. CRUCIA.TA, Torr. & Gray, with small narrow 

 petals, appears to be merely a rare garden (?) sport. E. Mass. 



Var. grandiflora, Lindl., has petals as long as the calyx-tube (1-2^' 

 long). Same range as the type, but not so common east. 



2. CE. Oakesiana, Robbing. Annual, more slender, not hairy, the pu- 

 berulence mainly appressed ; calyx-tips not contiguous at base ; otherwise 

 nearly as in the typical form of the last. (CE. bienuis, var. Oakesiana, Gray.) 

 Dry places, E. Mass., R. I., and Conn. 



M- -i- Flowers in a leafy spike or axillary ; capsules linear. 



3. CE. rhombipetala, Nutt. Rarely branching, appressed-puberulent 

 and subcanescent ; leaves narrowly lanceolate, acuminate, denticulate, the 

 lowest attenuate to a petiole and rarely pinnatifid, diminishing upward into 

 the close, elongated, conspicuously bracted spike , calyx silky-canescent (tube 

 \\' long) ; petals rhombic-ovate (6 - 10' long). Ind. to Minn, and Ark. 



4. CE. humifusa, Nutt. Stems decumbent or ascending (| - 2 long) ; 

 hoary-pubescent with short dense appressed hairs; leaves narrowly lanceolate or 

 oblauceolate (- 1' long), sparingly repand-dentate or entire, the radical leaves 

 pinnatifid, the fioral not reduced; capsule -1' long, silky, curved; seeds 

 smooth. On the sea-coast, N. J. to Fla. 



5. CE. sinuata, L. Stems ascending or decumbent, simple or branched 

 (1 high or more), more or less strigose-pubescent and puberulent; leaves oblong 

 or lanceolate (1 -2' long), siniiately toothed or often pinnatifid, the floral simi- 



