336 GENTIANACE.E. (GENTIAN FAMILY.) 



Synopsis. 







* Corolla convolute, or (in Obolaria) imbricated in the bud. Testa membrauaceous 



Leaves sessile. 



1. SABBATIA. Style conspicuous, deciduous. Stignias linear, twisted. Corolla wheel- 

 shaped, 5 - 12-parted. 



'2. EUSTOMA. Style conspicuous, persistent. Stigmas roundish, flat. Corolla tubular, 

 4 - r>-parted. 



3. GENTIANA. Stigmas sessile, flat, persistent. Corolla bell-shaped or funnel-form, 



4-;"i-lobed, mostly with plaited appendages between the lobes. 



4. BARTONIA. Calyx and corolla 4-lobed. Stigmas sessile. Leaves scale-like. 



5. VOYRIA. Stigma capitate. Corolla salver-shaped. Stem white, scaly. 

 0. OBOLARIA. Calyx 2-leaved. Corolla 4-lobed, imbricated in the bud. 



7. FRASERA. Corolla wheel-shaped, 4-parted, the lobes with a large depressed gland in 



the middle. 



* * Corolla folded in the bud. Testa woody. Petioles elongated. 



8. LIMNANTHEMUM. Leaves floating, cordate. Flowers clustered on the petiole. 



1. SABBATIA, A dans. AMERICAN CENTAURY. 



Calyx 5 - 12-parted. Corolla wheel-shaped, 5 - 12-parted, withering-persist- 

 ent. Stamens 5-12, inserted on the throat of the corolla : anthers sagittate, 

 iiiostlv recurved. Style conspicuous : stigmas linear or oblong, twisted. 

 Capsule globose, 1 -celled, 2-valved, many -seeded. Annual or biennial branch- 

 ing herbs, with cymose or panicled white or purple showy flowers. 



* Calyx and corolla mostly 5-parted. 

 H- Flowers in corymbose cymes, while, turning yellowish : tranches opposite. 



1. S. lanceolata, Torr. & Gray. Stem tall, terete below. 4-angled and 

 corymbosely branched above ; leaves ovate or roundish, 3 - 5-nerved, clasping, 

 the upper lanceolate ; cymes many-flowered ; lobes of the corolla (often 6) 

 obovate-oblong, twice as long as the filiform calyx lobes. (S. corymbosa, 

 /lull! 10.) Wet pine barrens, Florida to North Carolina. July. Stem 2 - 

 3 high. Leaves 1'- !' long ; the lowest small. Corolla 10" wide. 



2. S. puiliculata,, Pursh. Stem virgate, wing-angled throughout, com- 

 monly much branched from the base ; leaves clasping, lanceolate, 3-uerved, 

 the upper and floral ones linear, the lowest tufted, oblong-obovate ; cymes 

 densely few-flowered, leafy ; lobes of the corolla obovate, one third longer 

 than the linear calyx lobes. Low grassy meadows, Florida to North Caro- 

 lina. August. Stem 9'- 18' high. Leaves '- 1' long. Corolla |' wide. 



3. S. macrophylla, Hook. Glaucous ; stem terete, corymbosely 

 branched above; leaves thick, erect, ovate-lanceolate, acute, clasping, 3 - 5- 

 nervcd ; cviiies large, flat-topped ; corolla small, the lobes thrice as long as 

 the very short bristle-like calyx lobes. Wet pine barrens, Florida, and west 

 ward. July -August. Stem rigid, hollow, 2-2J high. Leaves l^'-3' 

 long. Corolla 5" -6" wide. 



-t--t- Flowers in panicled cymes, purple : branches opposite. 



4. S. angularis, Pnrsh. Stem square, wing-angled, erect, paniculately 

 much branched ; leaves numerous, ovate, clasping, 3 - 5-nerved, often as long 

 as the joints, the upper acute ; lobes of the corolla oblong, about twice as long 



