ONAGARLE. 117 



HAB. Low grounds. Penn. N. to Arc. Amer. Aug.. Sept. 11. 

 Stem 23 feet high. Floicers pale red. 



5. E. leptophyllum Rqf. : stem branching, somewhat scabrous ; leaves 

 alternate, subsessile, narrow-linear, entire, smooth, 1-nerved, acute, 

 narrowed at base ; flowers axillary, solitary, pedunculate. 



HAB. Moist woods. Penn. and Mar. Rqf. in De Cand. Prod. 



6. E. tetragonum Linn. : stem 4-sided, nearly smooth ; leaves sessile, 

 lanceolate-oblong, denticulate, lower ones opposite ; stigma undivided. 



HAB. Low grounds. Can. to Car. July. If. Stem 2 feet 

 high, branched, smooth. Flowers small, pale red, in terminal 

 racemes. Distinguished by its square stem. 



7. E. strictum Muhl. : densely and softly pubescent ; stejn terete ; 

 leaves oblong-linear, sessile, very entire ; the lower ones opposite ; 

 upper ones alternate ; flowers pedicillate, subterminal, regular ; petals 

 2-lobed ; stigma entire. E. molle Terr. 



HAB. Sand plains. N. Y. Aug. If.. Stem 18 inches high, 

 branched above and covered with a white pubescence. Leaves 

 narrow, numerous. Flowers small, pale purple. The name 

 given to this species by Dr. Torrey is objectionable, having been 

 previously appropriated to another species found on the conti- 

 nent of Europe. My specimens agree very well with Sprengel's 

 description of E. strictum of Muhlenberg. 



8. E. alpinum Linn. : stem simple, subterete, one or two flowered ; 

 leaves opposite, elliptical, entire ; flowers sessile. 



HAB. White mountains, N. H, N. to Arc. Amer. Big. July. 

 11. The smallest species, not above two inches high. Flowers 

 pale purple. 



2. GAURA. Linn. 



Calyx 3 4 sepalled ; sepals united into a long obovate 

 tube; limb caducous. Carol 3 4 petalled Stamens 6 8. 

 Ovary 3 4-sided, united to the base of the calyx. Seeds 

 1 4, not crowned with pappus. Octandria. Monogynia. 



G. bicnnis Linn. : stem herbaceous erect, hairy, mostly purplish ; 

 leaves alternate, sessile, lanceolate, toothed ; flowers numerous, ses- 

 sile, in terminal spikes ; fruit roundish, slightly 4-angled, pubescent. 

 HAB. Banks of streams. N. Y. to Car. July, Aug. tf.Stem 

 2 3 feet high. Floicers dark rose-coloured, sessile, in terminal 

 spikes. 



3. (ENOTHERA. Linn. 



Calyx 4-sepalled ; sepals united into a long 4-sided or 

 8-ribbed tube ; limb and part of the tube caducous. Petals 

 4. Stamens 8, erect or declined ; pollen triangular, viscous. 

 Stigma 4-cleft, or spherical. Capsule oblong-linear, obtusely 



