266 ORDER 97. GENTIANACE^E. 



ORDER XCVII. GENTIANACE^E. GENTIANWORTS. 



Herbs smooth, with a colorless, bitter juice, with entire, exstipulate 

 leaves. Flowers regular, mostly centrifugal in inflorescence and convolute 

 in the bud. Calyx persistent. Corolla withering, its lobes alternate with 

 the stamens. Ovary free, 1-celled, with 2 more or less projecting parieta. 

 placentae. Fruit a 2-valvcd, septicidal, oo-seeded capsule, rarely baccate 

 Seeds with a minute, straight embryo in the axis of fleshy albumen. Fig 1 MX 



I. GENTIANEjE. Corolla convolute (in No. 8 imbricate) in the bud. Leaves opposite. ..(/>) 



II. MENYANTHEyE. Corolla vitlvate-induplicate in the bud. Leaves alternate or radical. ..() 



a Petals beardless or nearly so. Leaves simple, floating LIMNAXTHKMUM. JO 



a Petals bearded inside. Leaves trifoliate, erect MKNYANTHES. 9 



ft Sepals only 2. Corolla 4-parted, tubular-campanulato OBOLARIA. 8 



b Sepals as many as the petals, more or less united. . ,(r) 



c Corolla lobes furnished each with a spur in the middle of the back HALKNPA. 7 



c Corolla lobes furnished each with a large central gland FRASKRA. 6 



c Corolla lobes plain, without spurs or glands. . .(d) 



d Leaves reduced t j scales. Corolla deeply 4-parted BARTONIA. 5 



d Leafy. e Style none, stig. sessile. Corolla tubular GKNTIANA. 4 



e Style present. x Corolla tube longer than the limb KRYTHR^EA. 3 



x Corolla tube shorter than the limb EUSTOV A. 2 



x Corolla wheel-form, tube none SA BBATIA. ] 



1. SABBATIA, Adams. AMERICAN CENTAURY. Calyx 5-12-parted. 

 Cor. rotate, 5-12-parted. Sta. 5 12, anth. soon recurved. Style 2-parted, 

 Caps. 1-celled. (T)@ Slender, with very beautiful flowers, in Summer. 



LAPITU^A. Corolla 7-12-(mostly 9-)parted, rose-red Nos. 1, 2 



SABBATIA proper. Corolla 5- (rarely 6-)partcd . . . (a) 



Flowers white but I x paniculate or scattered Nos. 3, 4 



drying yellowish ) x in a level-topped cyme. Branches opposite Nos. 5, 6 



a Flowers rose-red. b Branches opposite Nos, 7, 8 



6 Branches alternate Nos. 9, 10 



1 S. cliloroldes Ph. Simple or forked; flowers 15, pedunculate, 20"; petals ob- 



lanceolate, 10" ; sepals linear-spatulate, 6" ; leaves lanceolate to oblong. Wet 

 grounds. Plymouth, Mass.. R. I., and S. 1 2f. t 



2 S. jjentiaiiold.es Ell. Strict, subsimple ; leaves linear, exceeding the internodes ; 



flowers sessile, 2-bracted, solitary, or several together; petals obovate, 10"; sepal-d 

 I. 1 nee-subulate, 4". Wet barrens, Ga., Fla., andW. 1 2f. 

 /3. Itoi/ktntf (Gray).' Leaves lance-oblong, at least the lower. Ga. 



3 S. calyeosa Ph. Rigid, divaricately-forked ; flowers few, distant; sepals oblancoo- 



latc (5 8"), as long as the petals ; leaves oblong, 3-veinecl. Va., andS. If. 



4 S. paiiiculata Ph. Stem much branched, terete, with 4 thread-like rLlgep 



branches mostly opposite ; leaves small, oval, oblong to linear ; panicle diffuse ; se 

 pals subulate, 3" ; petals 0". Low grounds, Va., and S. 1 2f. 



^. XHlioltU, Branches alternate ; leaves mostly linear : petals 7 or 8". 

 # S. laiiceola.ta (Walt.) Corymbously-branched anJ 4-angled above; leaves ovate 

 to lanceolate, 3-5-veined ; flowers (j-parted, V broad. Barrens, N. J. to Fla. 2f. 



6 S. macropliylJa Hook. Stem terete throughout, corymbed at top ; leaves erect, 



thick, ovate, acuminate, 3-5-veined ; flowers small (\' broad). Fla., La. 



7 S. angul ris Ph. Stem with 4 winged angles, corymbous-panicled ; leaves ovate, 



5-veined, clasping; flowers 1518' broad, with a greenish star. Wet meadows. 

 N. Y. to Til., and S. 1018'. 



8 S, bratclilata .'.'11. Stem obtusely 1 -aa^lcd, paniclcd : leave? lance linear to linear 



