190 ONAGRACE^. (eVENING-PRIMROSK FAMILY.) 



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

 and shortly appeudaged. (E. alpinum, Man.) — AVhite >\Its., dells of the Wis- 

 consin River (Lapham), 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 titan 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.) — Fenn. to Minn, and the White Mts., north and westward. (Eu.) 



4. OENOTHERA, 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 ; flowers erect in the bud, nocturnal, yelloiv, the 



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



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



1. CE. biennis, L. (Comivion 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 i - f ' long ; capsule more or less pubescent or hirsute. — 

 Throughout the U. S. — Var. cruciXta, 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, Robbins. 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. biennis, var. Oakesiana, Gray.) 

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



H- •)- Flowers in a leafy spike or axillary ; capsides 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 

 tlie close, elongated, conspicuously bracted spike , calyx silky-cauescent (tube 

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



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

 hoary-puhescent icith short dense appressed hairs; leaves narrowly lanceolate or 

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

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

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



5. (E. sinuata, L. Stems ascending or decumbent, simple or branched 

 (1° high or more), luore or less strigose-piibescent and puberuleut ; leaves oblong 

 or lanceolate (1 -2' long), sinuately toothed or often pinnatifld, the floral simi- 



