120 COMMON CANADIAN WILD PLANTS. 



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

 small and compact panicle, not more than2 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. scabra, Torr. and Gray, has the leaves very rough 

 above and whitish-woolly beneath> — N. W. 



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

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

 sharply serrate, except at the base, smooth bol^ sides, rough- 

 ciliate. Bays 7-14, rather long. Panicle large, puiescen^. — 

 Open thickets and meadows. 



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

 less pubescent beneath. — Thickets and low grounds. 



****** Inflorescence aflat-topped corymb, 



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

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

 margins rough-pt^bescent. Heads in dense corymbed clus- 

 ters, giving a decidedly characteristic aspect to this sffecies. 

 — Low lake- and river-margins. 



a*. AR'NICA, L. 



1. A. Clfamisso'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 thiokish, narrowly oblong to lanceolate, the cauline 

 only 1 or 2 pairs. — N. W. 



