GENTIANACE^. 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. ^.—Slem 12—18 inches high, 

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

 Flowers solitary at the extremity of the branches, forming a 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, muclj shorter than the obovate-elliptic lobes of the corolla, Chi- 

 ronia ang^daris Li7in. 



Wet meadows. Can. to Car. W. to Miss. Aug. (^.—Stem 1—2 feet high, 

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

 ers rose-color, American Centaury. 



3. S. gracilis Salish. : stem teretish ; branches altj|piate ; leaves linear, the 

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

 lobes of the corolla elliptic-oblong, obtuse. 5". campanulala Torr. Chiro- 

 nia campanulata Linn. 



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

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

 ers purple. Slender Sabbatia. 



4. (S. calycosa Pursh : 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. (g). — Stem a foot high, slightly angled, 

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

 rose-color. Dichotomous Sabbada. 



5. S. chloroides 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. Chiro7iia chloroides Mich. Chlora dodecan- 

 dra Linn. 



Salt bogs. N. Y. toCar. Aug. ^.— Stem 1—1 ieei high., ieaves 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. %.. — Stem a foot high, branched near 

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

 white, 5 — 6-parted. Corymbose Sabbatia. 



6, ERYTHR^A. Rich.— Centsimy. 

 (From the Greek epvdposy red ; the prevaihng color of the flowers.) 



Calyx tubular, 5-cleft. Corolla funnel-form ; limb short, 6^ 

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



