This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Stem 4-angled, branched, 6'-15' high, the branches alternate or dichotomous, or the lowest opposite. Leaves ovate, oblong or lanceolate, mostly obtuse at the apex, sessile or slightly clasping and subcordate at the base, 1/2'- 1' long; flowers solitary at the ends of the branches and peduncles, 1-2' broad; peduncles, 1-2' long; calyx 5-ribbed or almost 5-winged, its lobes lanceolate, acute, 6"-12" long, about as long as the obovate lilac corolla-segments, becoming rather rigid in fruit; style 2-cleft; capsule oblong, 3"-4" high.
Sabbatia stellaris Pursh, Fl. Am. Sept. 1: 137. 1814. Chironia stellata Muhl. Cat. Ed. 2, 23. 1818.
Stem nearly terete, or slightly 4-angled, usually much branched, 6'-2° high, the branches alternate. Leaves lanceolate-oblong to linear, sessile, i'-2' long, 2"-$" wide, or the lowest smaller, somewhat obovate and obtuse, the uppermost narrowly linear and bract-like; flowers 9"-18" broad, usually numerous, solitary at the ends of the branches or slender peduncles; calyx not ribbed, its lobes narrowly linear, shorter than or nearly equalling the oblong or obovate corolla-segments; corolla pink to white with a yellowish starry eye bordered with red; style 2-cleft to below the middle; capsule about 2\" high.
In salt-meadows, coast of Massachusetts to Florida. Recorded from Maine. Called also Rose-of-Plymoutlu July-Sept.
Swertia difformis L. Sp. Pl. 226. 1753?
Sabbatia paniculata Ell. Bot. S. C. & Ga. x: 282. 1817. Not Pursh, 1814.
S. Elliottii Steud. Nomenel. Ed. 2, 2: 489. 1841.
Stem paniculately branched, terete or slightly ridged, 1°-2° high, the branches alternate. Lower leaves obovate or lanceolate-oblong, obtuse, 6"-9" long, the upper and those of the branches narrowly linear or subulate; flowers very numerous, white, solitary at the ends of the branches and short peduncles, 1' broad or less; calyx not ribbed, its lobes subulate-linear, one-half as long as the spatulate or oblanceo-late segments of the corolla, or less; style 2-parted; capsule about 21/2" high.
In pine-barrens, Virginia and North Carolina to Florida. Quinine-flower. July-Sept.
Chironia campanulata L. Sp. Pl. 190. 1753- Chironia gracilis Michx. Fl. Bor. Am. 1: 146. 1803.
Sabbatia gracilis Salisb. Parad. Lond. pl, 32. 1806.
Sabbatia campanulata Torr. Fl. U. S. 1: 217. 1824.
Similar to the preceding species. Stem usually very slender and much branched, 1°-2° high, the branches alternate. Leaves linear, or linear-lanceolate, 1'-1 1/2' long, sessile, acute, or the lowest much shorter, obtuse, oblong or oblanceolate, sometimes narrowed into short petioles, the uppermost almost filiform; flowers pink with a yellow eye, about 1' broad, solitary at the ends of the branches and peduncles, mostly 5-parted; calyx-lobes filiform-linear, equalling the oblong-obovate corolla-segments, or somewhat shorter; style 2-cleft to about the middle; capsule obovoid, about 22" high.