CENOTHERA. LV. ONAGRACE^E. 263 



ticulate, smooth, attenuate at base, rather acute, lower ones opposite ; pet. small, 

 obcordate, twice longer than calyx ; sty. included ; stig. clavate ; caps, pubes- 

 cent. In swamps and marshes, Penn. to Artie Am., W. to Oregon. Stem I 

 2f high, very branching. Leaves mostly alternate,. 1 3' long, | as wide, en- 

 tire, or with a few minute teeth. Flowers numerous, axillary. Petals rose- 

 color. Capsules 1 2' long, on short pedicels. Aug. 



0. albifiarum. Lehm. (E. lineare. Muhl.} St. slender, at first simple, 

 branched at top ; Ivs. linear, entire, margin revolute ; capsules canescent. 



4. E. MOLLE. Torr. (E. strictum. Muhl.} Soft Epilobium. 



Plant clothed with a dense, soft, velvet-like pubescence ; st. terete, straight, 

 erect, branching above ; Ivs. opposite (alternate above), crowded, sessile, mostly 

 entire and oblong-linear, obtusish ; pet. deeply emarginate, twice longer than 

 the calyx ; stig. large, turbinate ; caps, elongated, subsessile. Swamps, Mass. 

 to N. J., rare. Stem 1 2f high. Leaves numerous, 8 15" by 1 4". Flow- 

 ers rose-color. Capsules 3' long. Sept. 



5. E. ALPlNUM. Alpine Epilobium. 



St. creeping at base, usually with 2 pubescent lines, few-flowered ; Ivs. 

 opposite, oblong-ovate, subentire, obtuse, sessile or subpetiolate, smooth ; stig. 

 undivided ; caps, mostly pedicellate. Mountains, Northern States to Artie Am. 

 Stem 6 12' high. Leaves often slightly petiolate and denticulate, lower ob- 

 tuse, middle acute, and upper acuminate. Flowers smaller than in E. molle, 

 reddish-white. 

 /?. natans. Hornem. Si. large, nodding at the summit ; Ivs. oblong, denticulate. 



2. CENOTHERA. 



Gr. o>of, wine, Sripw, to hunt; the root is said to cause a thirst for wine. 



Calyx tube prolonged beyond the ovary, deciduous, segments 4. 

 reflexed ; petals 4, equal, obcordate or obovate, inserted into the top 

 of the tube ; stamens 8 ; capsule 4-celled. 4-valved ; stigma 4-lobed ; 

 seeds many, naked. Herbs with alternate leaves. 



1. CE. BIENNIS. Common Evening Primrose. Scottish: (Fig. 45.) 



St. erect, hirsute ; Ivs. ovate-lanceolate, repand-denticulate ; fls. sessile, in 

 a terminal, leafy spike ; calyx tube 2 or 3 times longer than the ovary ; sta. 

 shorter than petals ; caps, oblong, obtusely 4-angled. and (g) Common in 

 fields and waste places, U. S. and British Am. Stem mostly simple, 2 5f 

 high, with whitish, scattered hairs. Leaves 3 6' by i i', roughly pubes- 

 cent, slightly toothed, sessile on the stem, radical ones tapering into a petiole. 

 Flowers numerous, opening by night and continuing but a single day. Petals 

 large, roundish, obcordate. Seeds very numerous, 2 rows in each cell. Jn. Aug. 



/?. muricata. (CE. muricata. Ph.} St. muricate or strigosely hirsute, red; 

 pet. scarcely longer than the stamens. Stem 1 2f high. 



y. grandiflora. (CE. grandiflora. Ait.') Pet. much longer than the stamens, 

 rather deeply obcordate. Stem branched, f 



2. CE. FRUTICOSA: Perennial Evening Primrose. 



St. pubescent or hirsute ; Ivs. oblong-lanceolate, repand-denticulate ; roc. 

 leafy, or naked below, corymbed ; caps, oblong-clavate, 4-angled, pedicellate. 

 %. In sterile soils, Mass., Ct., N. Y. to Flor. and Western States. Stem hard, 

 rigid, (not shrubby) branched, purple, 1 3f high. Leaves variable in pubes- 

 cence, form and size., 1 3' by 3 8", sessile, minutely punctate. Flowers few 

 or many, 1 J'diam. in a terminal, bracteate, mostly pedunculate raceme. Calyx 

 tube longer than the ovary. Petals broad-obcordate, yellow. Jn. Aug. 

 /?. ambigua. Lvs. membranaceous ; pet. longer than broad. 



3. CE. PUMILA (& CE. pusilla? Michx.} Dwarf Evening Primrose. 

 Low, pubescent ; st. ascending ; Ivs. lanceolate, entire, obtuse, attenuate 



at base ; spike loose, leafy, naked below ; calyx tube shorter than the subsessile, 



ing in succession 1 or 2 at a lime. Jn. Aug. 

 23 



