240 COMPOSITE FAMILY. 



lower and larger somewhat serrate ; scales linear, green at the tip and 

 down the hack ; rays small, white or violet. Common. 



A. paniculatus, Lam. Often taller, generally more strict, profusely 

 paniculate-hranched ; leaves thin, oblong or narrow-linear, the lower 

 sharply serrate, upper entire ; heads larger, in loose and leafy panicles ; 

 scales narrow-linear with green tips and the outer ones green the whole 

 length ; flowers violet or nearly white. Common. 



A. salicif61ius, Ait. Leaves shorter and firmer than in the last, often 

 scabrous, mostly entire; scales more imbricated, firmer, linear, with 

 acutish green tips ; heads (rarely white) tending to be racemosely clus- 

 tered. Common. 



() Scales nenrhj equal. 



A. jilnceus, Ait. Slender and nearly simple, l°-3° ; leaves long- 

 linear (8'-5'), all (or all but the lower most) entire ; heads comparatively 

 few, liglit-purple, the outer scales a little shorter than the inner. Bogs, N. 



A. longif61ius, Lam. More branched ; leaves broader, entire or 

 sparsely .strnilate ; heads larger, the scales about equal and little imbri- 

 cated ; rays vinlet to almost white. Far N. 



17. ERIGERON, FLEAB.\NE. (Greek words for spriiuj and old man, 

 suggested probably by the hoary appearance of some vernal species.) 

 (p. 225.) 



* Bays conspicuoiis ; heads more or less corymbed; stem erect. 



-1- Says purple or purplish, very numerous (50-1.50); pappus simple. 11 



E. Philad^lphicus, Linn. Rather liiiiry, 2" high ; stem leaves oblong, 

 mostly entire, and partly clasping ; spatuiate and toothed root leaves, and 

 several heads ; rays very many and narrow, pale reddish-purple ; flowers 

 summer. Cmnninn. 



E. bellidif6lius, Muhl. Koiun's ri.ANTAix. Soft-hairy, 1^-2" high, 

 with a cluster of rather large roundish root leaves lying flat on the 

 ground ; stem leaves rather few and small ; heads 1-0 and long-pedun- 

 cled, rather large, with about 50 linear, light bluisli-purple rays ; flowers 

 late spring. Common. 



-1- •<- Bays white, only about CO, rather broad ; pappus simple. 2/ 



E. nudicatilis, Michx. Smooth, with oval or spatuiate leaves all at 

 the root ; slender scape l'^-2° high, with a few small heads ; flowers 

 spring. Low grounds, Va., S. 



-!--*--»- Bays u'hite or nearly so, 50 or more, narroic ; pappus double, the 

 outer of a row of minute chaffy bristles or little scales. (2) 



E. strigdaus, Muhl. 2°-4° high, smoothish, or roughish, with minute 

 close-pressed hairs ; leaves entire, the lower spatuiate and siender-petioled, 

 the upper lanceolate ; rays rather long ; flowers all summer. Fields. 



E. ^nnuus, Pers. S°-[>^ high, branched above, roughish, with spread- 

 ing hairs ; leaves ovate or lance-ovate, tlie lower ones coarsely toothed ; 

 rays rather short, often tinged with purple ; flowers all summer. Fields 

 and waste places. 



* * Bays inconspicuous, scarcely longer than the cylindrical, bell-shaped, 

 itivohicre and the simple pappus, numerous, in more than one roio. 



E. Canadensis, Linn. Horskweed, Bhtterweed, Mare's-tail. A 



common weed, with strong odor, in waste or cult, ground ; bristly hairy ; 

 stem erect, strict, l°-5° high ; leaves linear, only the lowest ones cut- 

 lobed ; heads of whitish flowers very small, panicled ; all summer. ® 



