266 ORDER 97. GENTIANACE^E. 



ORDER XCYII. GENTIANACE J3. 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. 

 placenta?. Fruit a 2-valvecl, septicidal, co-seeded capsule, rarely baccate 

 Seeds with a minute, straight embryo in the axis of fleshy albumen. Fig 1 40. 



I. GEXTIA.VE.E. Corolla convolute (in No. 8 imbricate) in the bud. Leaves opposite. . .(&) 



II. MENYAXTHE.E. Corolla valvate-iuduplicate it the bud. Leaves alternate or radical. ..(a) 



a Petals beardless or nearly so. Leaves simple, floating LIMNANTHEMUM. 10 



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



6 Sepals only 2. Corolla 4-parted, tubular-campanulate OBOLAIUA. 8 



6 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 HALENMI. 7 



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



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



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



d Leafy.* Style none, stig. sessile. Corolla tubular GENII ANA. 4 



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



x Corolla tube shorter than the limb EUSTOMA. 2 



x X!!orolla wheel-form, tube none SABBATIA. 1 



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. (i)(2) Slender, with, very beautiful flowers, in Summer. 



LAPITH.EA. Corolla 7-12-(mostly 9-)parted, rose-red Nos. 1, 2 



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



a Flowers white but \ a 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 



b Branches alternate Nos. 9, 10 



1 S. cliloroides Ph. Simple or forked ; flowers 1 5, pedunculate, 20"; petals ob- 



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

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



2 S. gentianoides Ell. Strict, Subsiraple ; leaves linear, exceeding the internodes ; 



flowers sessile, 2-bracted, solitary, or several together; petals obovate, 10": sepals 

 lance-subulate, 4". Wet barrens, Ga., Fla., and W. 1 2f. 

 /3. Bot/Kiiiit (Gray). Leaves lance-oblong, at least the lower. Ga. 



3 S. calycosa Ph. Rigid, divaricately-forked ; flowers few, distant ; sepals oblanceo- 



late (5 8"), as long as the petals ; leaves oblong, 3-veined. Va., audS. If. 



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



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

 pals subulate, 3" ; petals 6". Low grounds, Va., and S. 1 2f. 



/3. JSIHottii. Branches alternate ; leaves mostly linear : petals 7 or 8". 

 S. laiiceolata (Walt.) Corymbously -branched and 4-angled above ; leaves ovate 

 to lanceolate, 3-5-veined ; flowers 6-parted, V broad. Barrens, N. J. to Fla. 2f. 



6 S. macropliylla 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-paniMed ; leaves ovate, 



5-veined, clasping ; flowers 1-518 ' broad, with a greenish star. \S'et meadows, 

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



8 S. bracliiata Ell. Stem obtusely 4-angled, panicled ; leaves lance-linear to linear 



