342 GENTIANACE.K. (GENTIAN FAMILY.) 



sistent; the stamens inserted on its tube. Seeds anatropous, with a minute 

 embryo in fleshy albumen, sometimes covering the entire face of the peri- 

 carp I (Bitter-tonic plants.) 



Synopsis. 



TRIBE I. GE1VTIANE.3E. Lobes of the corolla convolute (twisted to the right) in the 

 bud (with the sinuses mostly plaited), in Obolaria imbricated. Leaves almost always 

 opposite or whorled, entire, those of the stem sessile. Seeds very small and numerous, 

 with a cellular coat ; in Obolaria, Bartonia, and several Gentians, the ovules and seeds 

 covering the whole face of the pericarp. 



* Style distinct and slender, deciduous. 



1. SABBATIA. Corolla wheel-shaped, 5- 12-parted: anthers curved. 



2. ERYTIill^EA. Corolla funnel-form or salver-shaped, 4-6-cleft : anthers spiral. 



* * Style (if any) and stigmas persistent: anthers straight. 

 - Corolla with a glandular spot or hollow spur to each lobe. 



3. FRASERA. Corolla 4-parted, wheel-shaped, spurless. Pod flat 



4. HALENIA. Corolla 4 - 5-cleft, bell-shaped, and with as many spurs from the base. 



- - Corolla without glands or spurs. 

 6 GENTIANA. Calyx 4 - 6-cleft. Corolla mostly with plaited folds at the sinuses. 



6. BAKTONIA. Calyx 4-partcd. Corolla 4-parted, with no plaits at the sinuses. 



7. OBOLARIA. Calyx 2-leaved. Corolla tubular-bell-shaped, 4-lobed, with no plaits, the 



lobes imbricated in the bud ! 



TRIBE II. MENYANTIIE^l. Lobes of the corolla valvate in the bud, with the edges 

 turned inwards. Stem-leaves alternate, petioled. Seed-coat hard or bony. 



8. MENYANTIIES. Corolla bearded inside. Leaves 3-foliolate. 



9. LnLNANTHEMUM. Corolla smooth above. Leaves simple, rounded. 



1. SABBATIA, Adans. AMERICAN CENTAURY. 



Calyx 5 -12-parted, the divisions slender. Corolla 5-12-partcd, wheel- 

 shaped. Stamens 5-12: anthers recurved. Style 2-parted, slender. Bien- 

 nials or annuals, with slender stems, and cymose-panicled handsome (white or 

 rose-purple) flowers. (Dedicated to Sabbati, an early Italian botanist.) 



# Corolla 5-parted, or rarely 6 7 '-parted. 

 - Corolla white, often turning yellowish in drying : cymes corymbed, tnany-Jfowercd. 



1. S. panicilluta, Pursh, Ell. Stein brachiately much-branched (l-2 

 high), rather terete, hut angled with 4 sharp lines ; /cares linear or the lower ob- 

 long, obtuse, \-nerved, nearly equalling the intcrnodes ; calyx-lobes linear-thread- 

 form, much shorter than the corolla. Damp pine woods, Virginia and south- 

 ward. June - Aug. 



2. S. lailCCOlata, Torr. & Gr. Stem simple (1- 3 high) hearing a flat- 

 topped cyme; /cares ovate-lanceolate or ovate, 3-nerved, the upper acute, much 

 shorter than the intcrnodes ; calyx-lobes longer than in No. 1 ; the flowers lar- 

 ger. (Chironia lanceolata, Walt. S. corymbosa, Baldw.) Wet pine barrens, 

 from New Jersey southward. June, July. 



*- - Corolla rose-color or pink, rarely white, mostly leith a yellowish or greenish eye. 

 ++ Erect, pyramidally many-Jlotoered: branches opposite, mr //.%// : peduncles short. 



3. S. braclliata, Ell. Stem slightly angled, simple below (l-2 high) ; 

 leaves lin'-ur and lincar-oblonq, obtuse, or the upper acute ; branches rather few 



