i'ENTANDRIA.— DIGYNIA. 127 



11. A. quadrifolia: stem erect, simple, smooth ; leaves 



by four*, ovate, acuminate, petiolate ; umbels 2, 

 terminal, erect, loose; pedicels capillary; nec- 

 tary bidentate ; hem very short. 

 HAB. Dr\ stony woods. June. ty . Stem 18 in, 

 high ; leaves mostly 8 ; 2 middle pairs approx. ; 

 limb, on '■ ig pedunc. ; fl. small, white. 



12. A. viridiflora : stem erect, simple, hairy; leaves 



oblong, on short petioles, tomentose-pubescent on 

 both sides, obtuse ; umbels lateral, solitary, sub- 

 sessile, nodding, dense ; horns of the nectary 

 wanting. 



HAB. Sandy fields. July. V-. Stem 2 ft. high, 

 densely pub es. ; leav. thick; umb. subglob.; Jl. 

 green. 



£. lanceolata : leaves lanceolate, acute. 



y. obovata : leaves obovate. 



A. verticillata : stem simple, marked with pubes- 

 cent lines ; leaves mostly verticillate, narrow- 

 linear, revolute ; nectaries short, bidentate ; horns 

 falcate, much exserted. 



HAB. Dry hills. July. U- Stem about 3 ft. 

 high, very slend. ; zvhorles 5 — G leav. / fl. small, 

 whitish. 



* * Leaflets alternate. 



14. A. tuberosa : stem erect, hairy, with spreading 

 branches ; leaves oblong-lanceolate, sessile ; um- 

 bels numerous, forming terminal corymbs. 

 HAB. Sandy fields. Aug. U. Root, large, tub. . 

 stem 3 ft. high ; fl. large, bright orange. 



192. GENTIANA. Gentian, Gentian*. 



t. G. Saponaria : leaves ovate-lanceolate, a 



nerved ; flowers vcrticillate-c.ijit.it.', ses-ik: ■ 

 corolla ventricose, closed, 10-cleft ; interioi 

 ments unequally 3-cleft, as long as the ext 

 ones ; segments of the calyx ovate, shorter than 

 the tube. 

 HAB. Wet meadows. Sept.— Oct. U . Stem 10 

 in. high t timp. ; leav. oppos. :fl. very large, brigh* 

 blue. 



