266 ORDER 97. GENTIANACE^E. 



ORDER XCVII. GENTIANACEJE. 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 pariela 

 placentae. Fruit a 2-valved, septicidal, co-seeded capsule, rarely baccate 

 Seeds with a minute, straight embryo in the axis of fleshy albumen. Fig 1 10 



I. GENTIANEjfi. Corolla convolute (in No. 8 imbriCHte) in the bud. Leaves opposite...*^ 



II. MENYANTHE>E. Corolla valvate-induplicate iu the bud. Leaves alternate or radical. ..(a) 



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



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



fc Sepals only 2. Corolla *-parted, tubular-campanulate OBOLAIUA. 8 



6 Sepals as many as the petals, more or less united. . .(c) 



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



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



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



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



" d Leafy. Style none, stig. sessile. Corolla tubular GENTIAMA. 1 



e Style present. z Corolla tube longer than the limb ERYTHR^BA. 3 



x Corolla tube shorter than the limb EUSTOX A. 2 



x Corolla wheel-form, tube none SJBBATIA. 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. () 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) 



o Flowers white but ) 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 



b Branches alternate Nos. 9, 10 



1 S. cliloroides Ph. Simple or forked; flowers 1 5, 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. gentlanoides Ell. Strict, subsimple ; 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. 

 ft. lloyktnii (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., and S. If. 



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



branches mostly opposite ; leaves small, oval, oblong to linear ; panicle diffuse ; t*f 

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



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

 S. lanceolata (Walt.) Corymbously-braached and 4-angled above; leaves o\ate 

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



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



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



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



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

 N. Y. to 111., and S. 1018'. 



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



