TETRANDRIA.— MONOGYNIA. 58 



longer than the leaves ; spike cylindrical, loose ; 



lower flowers distant ; bracts ovate, acute, as long 



as the calyx. 

 HAB. Sandy hills and fields. June. 0. Scape 2 — 3. in, 



long ; segments of the cal. subul. ; caps, %-seeded. 

 P. maxima: leaves ovate, subdenticulate, 9-nerved : 



spike cylindrical, imbricafe ; scape terete. 

 HAB. Wet rocky situations. July — Aug. P. cordata 



118. BARTONIA. Gentiance. 

 B. tenella: culm somewhat branched; peduncle** 



opposite, the lower ones branched ; segments of 



the corolla oval, acute, scarcely longer than the 



calyx ; style very short. 

 HAB. Swamps. Aug. — Sept. 0. Stem 3 — 8 in. high. 



very slend. ; leav. bract-like; Jl. small, greenish-white ■ 



119. EXACUM. Gentiance. 



E. pulchellum : calyx 4-parted ; segments subulate . 

 panicle corymbose ; peduncles filiform. 



HAB. Near the sea-coast. Aug. Flowers rose-colour. 



120. SWERTIA. Gentiance. Felwort. 

 S. deflexa: corolla campanulate, with deflexed horns 



at the base ; leaves ovate ; branches short. 

 HAB. Borders oflakes. Aug. $ . Stem 18 in. high 



nearly simp.; leav, oppos., sess. ; Jl. greenish-yell. 

 S. pusilla : corolla rotate, twice as long as the calyx ; 



stem simple, 1 -flowered ; leaves oblong. 

 HAB. High mountains. June. H- . One in. high; leav 

 1 — 2 pairs ; Jl. large, blue. 



121. FRASERA. 'Gentiance. American Colombo. 



F. caroliniensis. 



HAB. Borders oflakes. July. $ . Stem 3—5/*. high, 

 erect ; leav. oppos. andverticdl. ; Jl. greenish-yell. 

 punct. 



122. OBOLAIHA. Gtntianss. 



O. virginiaca. 



Mab. Shady forests. Apr.— May. U . Stem 3- 

 high. cespit.; leav. oppos. y obovate ;Jl. sublerm.. 

 or reddish, marcescent. 



H 



