33G GENTIAXACK.'E. (OENTIAN KAMILY.) 



Synopsis. 



• Corolla convolute, or (in Obolaria) imbriciitcJ in the bud. Testa membranaceous.— 



LeavoH 8es8ilu. 



1. SABBATIA. Style conspicuous, deciduous. Sti^nias linear, twisted. Corolla wheel- 



shaped, 5 - I'J-parted. 



2. EUSTOMA. Style conBpicuous, persistent. Stigiuas roundisli, flat. Corolla tubular, 



4 - ."(-parted. 



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



4 - "vlobed, mostly with plaited appendages between the lobes. 



4. B.\RTONIA. Calyx and corolla 4-lobed. Stigmas sessile. Leaves scale-like. 

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



{'•. OUOLAUI.\. Calyx V!-leaved. Corolla 4-lobed, imbricated in the bud. 



7. FK.\SER.\. Corolla wheel-shaped, 4-parted, the lobes with a large depressed glaud in 



the middle. 



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



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



1. SABBATIA, Adans. Amkhican Centaury. 



Cahx .">- 12-parte(l. Corolla wheel-sliapeil, 5- 12-parted, witliering-persist- 

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

 mostly recurved. Style conspicuous : stigmas linear or o1)long, twisted. 

 Capsule globose, 1-celled, 2-valved, many-seeded. — Annual or l)ieniiial branch- 

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

 * Cdlyx and corolla mostli/ b-pnrted. 



t- Floirers in cori/mbose ci/7nes, ickite, turninrj yellorrish : branches opposite. 



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

 corvmbosflv braiuhed above; leaves ovate or roundi.sh, 3 - 5-uerved, clasping, 

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

 oljovate-oblong, twice as long a.s the filiform calvx lobes. (S. corymbosa, 

 Bahlw.) — Wet pine barrens, Florida to North Carolina. July. — Stem 2° - 

 S^ high. Leaves 1'- H' long ; the lowest small. Corolla 10" wide. 



2. S. paniculata, I'ursh. Stem virgate, wing-angled throughout, com- 

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

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

 dens^elv 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 V -V long. Corolla ^' wide. 



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

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

 nerved ; cymes 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--- Flowers in panicled cymes, purple: branches opposite. 



4. S. angularis, Pursh. 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 



