PENTANDRIA.— DIGYNIA. 



terminal, long-pedunculate, generally solitary , 

 nectary slightly 2-toothed ; horns exserted. 



HAB. Sandy fields and hills. June — July. U Stem 

 2 — 3 ft. high ; leav. remarkably undulate ; fl. pale- 

 pur p. 

 5. A. laurifolia : stem erect, smooth ; leaves subses- 

 sile, oval-lanceolate, tapering to the summit, very 

 acute, smooth ; umbels on long peduncles, terminal 

 and axillary. 



HAB. Pennsylvania. Aug. U. Stem 2 ft. high ; 



summit pub es. ; leav. obtuse at base ; fl. green and 



pur p. 

 •I. A. incarnata : stem erect, branched above, tomen- 



tose, leaves sub^essile, lanceolate, tomentose, um- 

 bels erect, generally by pairs ; nectary entire ; 



horns subulate, exserted. 

 HAB, Wet places. U . Stem 2—3 ft. high , 

 umb, num., crowd.; fl. pale-purp. ; nect. trun- 

 cate. 



3. pulchra : stem and leaves very hairy. 

 7. A. amoena: stem with 2 longitudinal pubescent 

 lines ; leaves subsessile, oblong-oval, pubescent 

 beneath ; umbels terminal, erect ; nectary entire ,: 

 horn subulate, exserted. 



HAB. Swamps and wet meadows. July — Aug. 2£, 

 Stem 3 ft. high, nearly smooth ; umb. many -fl., pur p. 

 ;. A. purpnrascens : stem simple ; leaves ovate, vil- 

 lous beneath ; umbels erect ; leaflets of the nec- 

 tary resupinate. 



HAB. Wet places. %. Stem lift, high, hairy 

 above ; leav. on short pet. ; fl. purp. 



\. debilis: very smooth ; stem erect, weak, sim- 

 ple ; leaves petiolate, oval-lanceolate, acute at 

 each extremity, membranaceous ; umbels termi- 

 nal, loose. 



HAB. Shady rocky places. U . Leaves large; 

 flowers white. 



\. acuminata : stem erect, smooth, simple ; leaves 

 ovate, subcordate, acuminate, subsessiie ; umbels 

 lateral, solitary, erect ; nectary acute ; horn.* 

 scarcely exserted. 



HAB. Sandy swamps. Aug. 1/. Root large, tub. ,- 

 stem 18 in. high; umb. 2 ; fl. purp. and green. 



