COMPOSITE. 121 



XL. TUSSILA'GO, Tourn. COLTSFOOT. 



T. Far'fara, L. Wet places, chiefly eastward, but also 

 in Ontario. 



26. PETASI'TES, Tourn. SWEET COLTSFOOT. 



1. P. palma'ta, Gray. Leaves rounded, somewhat kid- 

 ney-shaped, palmately 5-7-lobed, the lobes toothed and cut. 

 Cedar-swamps and bogs ; wet banks of streams. 



2. P. sagitta'ta, Gray. Leaves deltoid-oblong to reni- 

 form-hastate, repand-dentate. Swamps, N.W. 



27. ASTER, L. STAKWORT. ASTEK. 



* Leaves, at least the lower ones, heart-shaped and petioled. 



1. A. COrymbO'SUS, Ait. Bays 6-9, white or nearly so. 

 Heads in corymbs. Stems slender, 1-2 feet high, zigzag. 

 Leaves thin, smoothish, sharp-pointed, coarsely serrate, all 

 the lower ones on slender naked petioles. Woodlands. 



2. A. macro phyTlus, L. Rays white or bluish. Stem 

 stout, 2-3 feet high. Leaves thickish, rough, finely serrate, 

 the lower long-petioled. Heads in closer corymbs than in 

 No. 1. Woodlands. 



3. A. azu'reus, Lindl. Bays 10-20, bright biue. Heads 

 racemed or panicled. Stem roughish, erect, racemose-com- 

 pound above. Leaves entire or nearly so, rough ; the lower 

 ovate-lanceolate, on long petioles ; the upper lanceolate or 

 linear, sessile. The latest flowering of our Asters. Dry soil. 



4. A. undula'tus, L. Bays bright blue. Heads racemed 

 or panicled. Stem hoary with close pubescence, spreading. 

 Leaves with somewhat wavy margins, entire or nearly so, 

 ovate or ovate-lanceolate, roughish above, downy beneath ; 

 the lowest cordate, on margined petioles; the upper with 

 winged short petioles clasping at the base, or sessile. Dry 

 woods. 



5. A. eordifo'lius, L. Bays pale blue or nearly white. 

 Heads small, profuse, panicled. Stem much branched. 

 Leaves thin, sharply serrate, the lower on slender ciiiate 



