COMPOSITE. 183 



culate racemes ; scales of the involucre loose, lanceolate, as long as 



the disk. A. novaanglia var. b. Ait. 



HAB. Old meadows. N. Y. to Car. Sept. Nov. If.. Stem 

 3 4 feet high, smooth or slightly pubescent on the young 

 branches. Ftowers large, blue and purple.-^Said by Pursh to 

 be the handsomest of the genus. 



16. A. phlogifolius Willd. : stem very simple, pubescent ; leaves 

 lanceolate, cordate, clasping, pubescent beneath, scabrous on the mar- 

 gin ; panicle terminal, loose, few-flowered ; scales of the involucre 

 loose, imbricate, lanceolate. A. amplexicaulis Mich. 



HAB. Moist grounds. N. J. toVirg. Aug. Nov. If. Stem 1 2 

 feet high. Flowers middle-sized, violet. 



17. A. patens Ait. : stem branching, hairy; leaves oblong-lanceolate, 

 ciliate, cordate, clasping, scabrous and hairy on both sides ; branches 

 sproading,^elongated, few-flowered, with minute leaves ; scales of the 

 involucre imbricate, lanceolate, spreading. A. diversifolius Mich. 



HAB. Hedges. N. S. Sept. Nov. U- Stem 12 feet high. 

 Floioers middle-sized ; rays blue or purple ; disk yellow. 



tt Leaves lanceolate and ovate ; the lower serrate. 



1 . Floicers in corymbs. 



13. A. nudiflorus Nutt.: stem simple and smooth ; leaves sessile, 

 ovate-lanceolate, subacuminate, sharply serrate, upper surface sca- 

 brous ; corymb simple, few-flowered ; peduncles pubescent, naked, 

 mostly 1 -flowered ; involucre hemispherical, closely imbricated ; scales 

 linear-oblong and ciliate. 



HAB. Swamps. N. J. rare. 2f . Stem 2 3 feet high. 



Leaves 3 inches long, 1 inch wide. Flowers on peduncles 34 

 inches long, large, pale purple. 



19. A. radula Jlit. . stem erect, simple, angular ; leaves lanceolate, 

 serrate, acuminate, rugose and very scabrous ; corymb terminal ; in- 

 volucre imbricate ; scales lanceolate, somewhat obtuse, subsquarrose. 



HAB. Nova Scotia and high mountains in N. S. Sept. Nov. 

 21. Flowers middle-sized;, rays short, white. 



20. A. strictus Pursh : leaves sessile, narrow-lanceolate, serrate, sca- 

 brous ; stem one or few-flowered above ; scales of the involucre imbri- 

 cate, appressed, oblong, acute, scarcely shorter than the disk. A. bi- 

 florus Mich. 



HAB. High mountains. N. S. N. to Labrador. Sept., Oct. 

 14. Stem 4 6 inches high. Flowers middle-sized ; rays pale 

 violet ; disk brownish-yellow. 



21. A. surculosus Mich. : stem simple, low and slender, minutely pu- 

 bescent ; lower leaves linear-lanceolate, entire or subserrate, scabrous 

 above ; upper ones linear, clasping ; corymb 3 5-flowered, somewhat 

 naked ; involucre imbricate, subsquarrose ; scales ciliate, linear-ob- 

 long, inner ones obtuse ; rays about 20. 



HAB. Woods. N. S. Torr. S. to Car. Sept. Oct. U.Root creep- 

 ing. Stem 12 18 inches high. Flowers rather large, violet 



