120 COMMON CANADIAN WILD PLANTS. 



Var. monta'na, Gray, is only 6-15 inches high, with a 

 small and compact panicle, not more than 2 or 3 inches long. 

 N.W. 



19. S. CanadensiS, L. Stem rough-hairy, tall and stout. 

 Leaves lanceolate, serrate, pubescent beneath, rough above. 

 Panicle exceedingly large. Very common along fences 

 and in moist thickets. 



Var. seabra, Torr. and Gray, has the leaves very rough 

 above and whitish- woolly beneath. N. W. 



20. S. sero'tina, Ait. (8. gigantea, Torr. and Gray.) 

 Stem smooth, stout. Leaves lanceolate, taper -pointed, 

 sharply serrate, except at the base, smooth both sides, rough- 

 ciliate. Bays 7-14, rather long. Panicle large, pubescent. 

 Open thickets and meadows. 



Var. gigante'a, Gray, is very tall and the leaves more or 

 less pubescent beneath. Thickets and low grounds. 



****** Inflorescence a fiat-topped corymb. 



21. S. laneeola'ta, L. Stem pubescent above, much 

 branched. Leaves linear-lanceolate, the nerves (3-5) and 

 margins rough-pubescent. Heads in dense corymbed clus- 

 ters, giving a decidedly characteristic aspect to this species. 

 Low lake- and river-margins. 



34. AK'NICA, L. 



1. A. ChamiSSO'nis, Less. Soft-hairy. Stem leafy to the 

 top, bearing 1-5 heads. Leaves thin and veiny, toothed ; 

 the upper ovate-lanceolate, sessile ; the lower narrow, taper- 

 ing to a margined petiole. Atl. Prov. 



2. A. folio'sa, Nutt., has lanceolate leaves, the upper 

 partly clasping and the lower with tapering bases connate. 

 Stem strict. N. W. 



3. A. alpi'na, Olin. Less leafy, low, yellowish-pubescent 

 or villous. Stem simple, bearing a single head as a rule. 

 Leaves thickish, narrowly oblong to lanceolate, the cauline 



1 or 2 pairs, N, W, 



