GENTIANE^E. 243 



iMary, very long, 1-flowered ; segments of the corol acute. H. linncn 

 Mich. 



HAB. Fields, N. Y. to Flor. April, May. U : Stem 48 

 inches high. Flowers blue, sometimes nearly white. 



2. H. longifolia Willd. : stem branched, smooth ; leaves narrow-lan- 

 ceolate, tapering at each extremity, very smooth ; flowers mostly in 

 threes, terminal, nearly sessile. H. angustifolia Mich. 



HAB. Hills and mountains. N. Y. to Flor. W. to Miss. June. 

 1. Stem 6 10 inches high, branched at the top. Leaves about 

 an inch long. Flowers often by threes, purple. 



3. H. purpurea IVilld. : stem erect, branched above, pubescent at the 

 joints ; leaves sessile, ovate or lanceolate, obtuse at base ; flowers in 

 terminal corymbs. H. varians Mich. 



HAB. Dry woods. Penn. to Car. Pursh. June Aug. If. 

 Stem erect, with the angles ciliate. Leaves broad, 3-nerved. 

 Floicers purple, in terminal corymbs. 



4. H. ciliolata Torr. : smooth, branched above, with remote joints j 

 radical leaves ovate, obtuse, tapering at. base ; margin ciliate ; stem 

 leaves ovate-spathulate, sessile ; flowers in terminal corymbs ; pedi- 

 celled ; peduncles trichotomous ; segments of the calyx linear-lanceo- 

 late. 



HAB. Wet rocks. Niagara Falls, N. Y. W. to Michigan. July. 

 U- Stem 46 inches high. Flowers terminal, blue. 



5. H. pubescens Raf.: leaves wedge-form, acute, pubescent; the 



lower ones somewhat petioled, lanceolate ; upper ones semi- 

 oval, sessile ; panicle trichotomous, terminal. 

 HAB. Penn. and Ohio. Raf. 



8. CENTAURELLA. Mich. 



Calyx 4-parted, oppressed. Corol subcampanulate, 4-part- 

 ed ; segments somewhat erect. Stamens 4. Stigma thick, 

 glandulpus and partly bifid. Capsule 1-celled, 2-valved, 

 many-seeded, surrounded by the persistent calyx and corol. 



Tetrandria. Monogynia. 



C. paniculata Mich. : stem somewhat branched, smooth ; peduncles 

 opposite, the lower ones branched ; leaves minute, subulate, alternate 

 below, nearly opposite above ; flowers in panicles ; corol as long as 

 the calyx ; style very short. C. autumnalis Pursh. Bartonia panicula- 

 ta Muhl. Torr.Saginavirginica Willd. 



HAB. Damp grounds. Mass, to Car. Aug., Sept. 0. Stem 

 4 8 inches high, square, often twisted. Flowers small, green- 

 ish-white, on the ends of the branches. 



9. VILLARSIA. Vent. 



Cahjjc 5-parted; Corol rotate ; tube short ; limb spread- 

 ing, 5-lobed, ciliate on the margin. Stamens 5. Style 1. 



