180 DICOTYLEDONOUS PLANTS. 



ones elongated ; scales of the involucre pilose j rays twice as long as 

 the calyx. 



HAB. Woods and pastures. Can. to Virg. N. to Arc. Amer. 



July, Aug. H. Stem 12 18 inches high. Flowers large, 



purple. 



5. E. strigosum Linn. : strigose and hairy ; leaves lanceolate, atten- 

 uate at each end, entire or with a few coarse teeth in the middle ; flow- 

 ers in a corymbose panicle. E. strigosum and E. nervosum Pursh. ? 



HAB. Fields and meadows. Can. to Car. W. to Miss. July, 

 Aug. tf.Stcm 2 3 feet high. Flowers white, with the rays 

 capillary. 



6. E. hcterophyllum Linn : radical leaves roundish-ovate, deeply 

 toothed, petiolate ; those of the stein lanceolate, acute, serrate in the 

 middle ; corymb terminal. 



HAB. Waste grounds. N. S. June Aug. tf. Stem 2 3 

 feet high. Flowers white. 



Subgenus CEAHOTUS. Nutt. Pappus simple. 



7. E. canadcnse Linn. : stem hispid, paniculate, often profusely 

 branched ; leaves lanceolate-linear ; florets of the ray numerous, 

 crowded, very short. E. canadcnse and E.pusittum Nutt. 



HAB. Dry fields. Can. to Flor. W. to Miss. July Sept 0. 

 Stem 6 inches to 6 feet high. When small, constituting E. pusil- 

 lum of Nuttall. 



24. ASTER. Linn. 



Involucre imbricate, with the lower scales often spreading. 

 Florets of the ray generally more than 10, (not yellow.) JJe- 

 ceptacle naked. Pafltus simple, hairy. 



Syngenesia. Superflua. 



OBS. Mr. Elliott's admirable Sketch of the Botany of South Caro- 

 lina and Georgia, contains detailed descriptions of many of our North- 

 ern Asters, and may be consulted with much advantage. The whole 

 genus is liable to great variations ; and it is more than probable that 

 many of the species here enumerated, will be found, on more minute 

 investigation, to be mere varieties. 



* Florets of ike ray 5, white. Scales of the involucre white, with the sum- 

 mits green. 



1. A. solidaginoides Mich.: leaves linear-lanceolate, entire, scabrous 

 on the margin ; branches corymbose-fastigiate ; flowers sessile, aggre- 

 gate ; scales of the involucre oblong-obtuse, appressed, somewhat re- 

 flexed at the summit. Conyza lintfolUi Linn. 



HAB. Dry swamps and woods. Penn. to Car. Aug. Oct. It. 

 Stem 2 feet high, smooth. Leaves almost linear, obscurely 3- 

 nerved. Flowers in small clusters, forming a fastigiate corymb. 



