112 GENTIANACEiE. Bartonia. 



5. BARTONIA. Muhl. ex Willd. in neue schri/t. ges. nat. fr. Berol. 3. p. 444 (1801) ; 



Torr, fl. \. p. 85, not of Pursh. bartonia, 



Centacrella, Mickc. Centaukium, Pers. Andrewsia, Spreng. 



[ In honor of Benj. F. Barton, professor of botany in Philadelphia.] 



Calyx deeply 4-parted, appressed. Corolla somewhat campanulate, withering ; the tube 

 short : limb 4-parted, with nearly erect lobes. Style short : stigma 2-lobed ; the lobes 

 decurrent on the style. Capsule 1-celled, 2-valved. Seeds numerous, minute. — Small 

 slender annual plants, with minute scale-like leaves and terminal flowers. 



1. Bartonia tenella, Muhl. Late-Jlowered Bartonia. 



Stem paniculately branched, strict, many-flowered ; peduncles opposite ; style much shorter 

 than the ovary. — Muhl. I. c; Pers. syn. 1. p. 141 ; Torr. fl. 1, p. 185. B. paniculata, 

 Muhl. cat. p. 15 ; Darlingt. fl. Cest. p. 111. Saguia Virginica, Linn. sp. 1. p. 128 ; Willd. 

 sp. 1. p. 719. Centaurella paniculata, Michx. fl. I. p. 98. t. 12. /. 1 ; Ell. sk. 1, p. 204 ; 

 Bigel. fl. Bost. p. 52; Beck, hot. p. 243. C. autumnalis, Pursh, fl. 1. p. 110 ; Griseb. 

 Gent. p. 308. Centaurium autumnale, Pers, I. c. p. 137. Andrewsia paniculata, Spreng. 

 anleit. kenn. gew. p. 474, ex Bart. fl. Phil. 1. p. 89 ; fl. N. Am. t. 53./. 2. 



Stem slender and wiry, 4-angled, 3-10 inches or more in height, of a yellowish-green 

 color, often twisted. Leaves subulate, rigid, scarcely an eighth of an inch long, closely 

 appressed, opposite or nearly so. Flowers mostly opposite and terminating the branches ; 

 the pedicels 2-3 lines long. Calyx about two-thirds the length of the corolla ; the segments 

 linear-lanceolate. Corolla pale greenish yellow, less than 2 lines long ; the segments oblong, 

 rather acute or obtuse. Stamens included. Ovary 4-sided : style covered on two opposite 

 sides with the decurrent lobes of the stigma. Seeds extremely numerous. 



Sterile moist grounds, and in dry swamps. August - September. The original name of 

 this plant is employed, because it is the oldest ; and besides, the Bartonia of Pursh and 

 Nuttall is now merged in Mentzelia. (See Torr. ^ Gr, fl. N. Am. 1. p. 532.) 



6. SABBATIA. Adans.fam.fl. 2, p. 503; Endl. gen. 3546. AMERICAN CENTAURY. 



[ Named after Liberatus Saeeati, an Italian botanist of the last century.] 



Calyx deeply 5- (rarely 8 - 12-) parted ; the segments narrow. Corolla somewhat rotate, 

 5- (or 8 - 12-) parted. Stamens 5 - 12 : anthers at length revolute. Ovary one-celled : 

 style short : stigmas linear, spirally twisted after flowering. Capsule 2-celled, 2-valved ; 

 the sutures introflexed, bearing the 2-lobed placentae. Seeds very numerous. — Smooth 

 herbs, with corymbose flowers. 



