lE-NOTHERA. LV. ONAGRACE^. 263 



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

 obcordate, twice longer than calyx ; sti/. included ; stig. clavate ; cajps. pubes- 

 cent. — In swamps and marshes, Penn. to Ai'tic Am., W. to Oregon. Stem 1 — 

 2f high, ver}^ branching. Leaves mostly alternate, 1 — 3' long, J as wide, en- 

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

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



/?. albifiorum. Lehm. (E. lineare. Miihl.) St. slender, at first simple, 

 branched at top ; lis. 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 ; lis. 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. — (i) Swamps, Mass. 

 to N. J., rare. Stem 1 — 2f high. Leaves numerous, 8 — 15" by 1 — i". 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. moUe, 

 reddish-white. 

 /?. natans. Hornem. — St. large, nodding at the summit ; lis. oblong, denticulate. 



2. CENOTHERA. 



Gr. oivos, wine, ^rjpcj, 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. ffi. BIENNIS. Common Evening Priinrose. Scaiisk. (Fig. 45.) 



St. erect, hirsute; hs. ovate-lanceolate, repand-denticulate ; Jls. sessile, in 

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

 shorter than petals ; caps, oblong, obtusely 4-angled. — (T) and ^ 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 — li', 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.') Pel. much longer than the stamens, 

 rather deeply obcordate. Stem branched, f 



2. OH. FRUTicos.i: Perennial Evening Primrose. 



St. pubescent or hirsute ; hs. oblong-lanceolate, repand-denticulate ; rac. 

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

 —1], 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|' diam. in a terminal, bracteate, mostly pedunculate raceme. Calyx 

 tube longer than the ovar}^ Petals broad-obcordate, yellow. Jn. — Aug. 

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



3. ffi. PUMiL.4. (& CE. pusillal Michx.) Divarf Evening Primrose. 

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



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

 oblong-clavate, angular ovary. — (§) A small, half-erect plant, common in grass 

 lands. Can. to S. Car. Stem 6 — 10' long, round, slender, simple. Leaves 1 — 

 IJ' by 2 — 3", radical ones spatulate, petiolate. Flowers yellow, 6" diam., open- 

 ing in succession 1 or 2 at a time. .Tn. — Aug. 

 23 



