ONAGRACE^E. 109 



ments 4, reflexed. Petals 4, equal. Stamens 8. Stigma 4- 

 lobed or capitate. Capsule 4-valved, many-seeded. Seeds 

 naked. 



* Capsule elongated, 4-sided, sessile. 



1. (E. biennis Linn. : stem erect, mostly simple, usually hairy; leaves 

 alternate ovate-lanceolate, repandly denticulate, acute, pubescent, lower 

 ones on short petioles ; capsule sessile, obtusely 4-angled, somewhat turgid. 

 (E. muricata Murr. (E. parviflwa Linn. (E. grandiflora Ait. 



Fields. Subarct. Araer. to Flor. W. to Ark. and Oregon. June, Aug. (1) 

 and @, Stem 2 5 feet high. Flowers yellow, variable in size, in a terminal 

 leafy spike 3 12 inches long. Petals obcordate. 



Common Evening Primrose. 



2. (E. sinuaia Linn. : pubescent or villous ; stem ascending or decum- 

 bent ; leaves oblong or lanceolate, nearly entire, sinuate-toothed or pinna- 

 tifid; calyx and ovary villous; capsule cylindric or somewhat prismatic, 

 elongated. (E. minima Pursh. 



Sandy fields. N. J. to Flor. W. to Miss. May, June. %. Stem 16 

 inches high, simple or branching from the base. Flowers small, axillary, sessile, 

 pale yellow. Petals obcordate. Sinuate-leaved Evening Primrose. 



** Capsule obovate-clavate, angular, mostly pedicellate. 



3. (E. fruticosa Linn. : hairy or nearly smooth ; stem erect, simple or 

 branched ; leaves lanceolate or oblong-lanceolate, slightly toothed ; petals 

 obcordate; capsules oblong-clavate, 4-winged, longer than the pedicels. 

 (E. ambigua Spreng. (E. hybrida Mich. (E. incana Nult. 



Shady woods. N. Y. to Flor. W. to Ohio. July. 7|.. Stem 13 feet 

 high. Leaves sessile or slightly petioled. Flowers large, pale yellow, in a pe- 

 duncled corymb. Varies much in the amount of pubescence. Sun Drop. 



' 4. (E. riparia Nutt. : slightly pubescent ; leaves linear-lanceolate, acute, 

 attenuate at base and somewhat petioled, remotely denticulate or entire ; pe- 

 tals slightly obcordate ; capsules subsessile, oblong-clavate, sometimes shorter 

 than the pedicels, slightly 4-winged, with 4 intermediate ribs. 



Swamps and banks of streams. Quaker Bridge, N. J. to Flor. June, July. 

 @. Stem 2 3 feet high, often vigately branched. Leaves rather thick, some- 

 what pubescent on the midrib and margin. Flowers large, yellow, somewhat 

 produced towards the summits of the branches. Swamp Evening Primrose. 



5. (E. linearis Mich. : stem erect or decumbent at base, slender and 

 often branched ; leaves narrow-lanceolate or linear, remotely denticulate or 

 entire, tapering at base ; capsule clavate, turbinate or obovate, mostly pu- 

 bescent or canescent, with the alternate angles slightly winged above. 



Dry sandy grounds. Montauk Point, Long Island, N. Y. (the decumbent 

 variety. Torr. fy Gr.) to Flor. and Louis. April July. 7J.. ? Stem 10 inches 

 to 2 feet high. Flowers rather large, yellow, somewhat corymbose at the ex- 

 tremity of the branches, but not in an elongated spike like those of (E. pumila. 



Narrow-leaved Evening Primrose. 



G. (E. chrysantha Mich. : pubescent ; stem ascending ; leaves lanceolate, 

 rather obtuse, entire or slightly toothed, the radical ones obovate-spatulate ; 

 petals broad-obovate, emarginate ; capsule clavate-oblong, pedicelled, the 

 alternate angles narrowly winged. 



Rocky grounds. Hudson's Bay to near Niagara Falls. June, July. . ? 



