GENTIANACK^. 239 



acute ; segments of calyx linear-subulate, half as long as the obovate lobes 

 of the corolla. S. gracilis Ell. 



Salt marshes. N. Y. to Car. Aug., Sept. (g). Stem 12 18 inches high, 

 often branched from near the root. Leaves somewhat fleshy, obscurely 3- nerved. 

 Floioers solitary at the extremity of the branches, forming e. small corymb, rose- 

 color. Salt-marsh Centaury. 



2. S. angularis Pursh : stem erect, square, somewhat winged ; leaves 

 ovate, clasping ; peduncles elongated, corymbed ; segments of the calyx 

 lanceolate, much shorter than the obovate-elliptic lobes of the corolla. Chi- 

 ronia angularis Linn. 



Wet meadows. Can. to Car. W. to Miss. Aug. .Stem 12 feet high, 

 with opposite branches. Leaves about an inch long, obscurely 5-nerved. Flow- 

 ers rose-color. American Centaury. 



3. S. gracilis Salisb. : stem teretish ; branches alternate ; leaves linear, the 

 lower ovate or lanceolate ; calyx as long as the corolla, the tube very short ; 

 lobes of the corolla elliptic-oblong, obtuse. S. campanulata Torr. Chiro- 

 nia campanulata Linn. 



Wet grounds. Penn. to Car. July, Aug. (|5). Stem a foot high, with long 

 branches. Panicle terminal, the branches spreading and few-flowered. Flow- 

 ers purple. Slender Sabbatia. 



4. S. calycosa Pursk : stem terete, dichotomously branched ; the branches 

 1-flowered ; leaves elliptic-oblong, 3-nerved ; segments of the calyx oblong- 

 lanceolate, leafy, larger than oblong obtuse lobes of the corolla. Chironia 

 calycosa Mich. C. dichotoma Walt. 



Wet meadows. N. Y. to Car. Aug. @. Stem a foot high, slightly angled, 

 with few branches. Leaves sessile, oval. thin. Flowers terminal, often solitary, 

 rose-color. Dichotomous Sabbatia. 



5. S. chloro-ides Pursh : stem weak, somewhat angled, with few 1-flow- 

 ered branches ; leaves lanceolate, erect ; branches few, 1 flowered ; flowers 

 7 12-parted ; segments of the calyx linear, much shorter than the elliptic- 

 lanceolate lobes of the corolla. Chironia chloroidcs Mich. Chlora dodecan- 

 dra Linn. 



Salt bogs. N. Y. to Car. Aug. .Stem 12 feet high. Leaves closely 

 sessile, without nerves, the lower ones ovate-spatulate. Flowers large, bright 

 rose-color. This and the preceding are very variable. 



Large-flowered Sabbatia. 



6. S. corymbosa Bald. : stem erect, nearly square, with opposite branches ; 

 leaves ovate-lanceolate, 3-nerved, sessile ; flowers corymbed ; segments of 

 the calyx linear, much shorter than the obovate oblong lobes of the corolla. 

 S. paniculata var. a. Pursh. Chironia lanceolata Walt. 



Swamps. N. J. to Car. Aug., Sept. Q\.. Stem a foot high, branched near 

 the summit. Leaves somewhat clasping. Corymb few-flowered. Corolla 

 white, 5 6-parted. Corymbose Sabbatia. 



6. ERYTHR^A. Rick. Centaury. 

 (From the Greek cpvQpos y red ; the prevailing color of the flowers.) 



Calyx tubular, 5 -cleft. Corolla funnel-form ; limb short, 5- 

 cleft. Stamens 5. Anthers, after flowering, spirally twisted 



