FLORA BOREALI-AMERICANA. 



(Ord. LI. COMPOSIT:^ 



Trib. V. AsTEROiDE^. Less. 



Subtrib. I. Astere^. Less, Capitula nunquam dioica^ plerumque heterogama^ floribus 

 $ in ambitu cut uni- auty si pluriserialibus, corollas tunc lingulatas gerentibus^ floris 

 busque J in centro. Rachis plerumque ebracteolata aut^ ubi bracteolata, pappus per^ 

 fectus et multiradiatus. nthercB ecaudatce. Less, 



52. SOLIDAGO* Z. 



Radius fcemineus uniserialis. Discus hermaphroditus. Pappus uniserialis, pilosus 

 Achenium teretiusculum, multicostatum. — Herbje plerumque AmericancB et elatce^ pauciores, 

 EuropecB vel Asiaticce, foUis alternis integris: capitulis parviusculis luteis plerumque in cymas 

 scorpioides dispositis et secundis; involucris imbricatiSy polppht/llis, rachis (seu receptacu- 



lum) nuda. Less, 



* Racemis secundis; foliis subtriplinerviis. 



1. S. Canadensis; caule villoso erecto, foliis lanceolatis serratis triplinerviis scabris, 

 racemis paniculatis secundis recurvis, ligulis abbreviatis. Ait, — Linn* — Ait, Hart, Kew, 

 ed. 1. V. 3. p, SIO. Purshy FL Am. v, 2, p. 535. Elliott^ Carol, v. 2, p. 389. — (3. foliis 

 angustioribus, floribus minus secundis. 



Hab. Throug-hout Canada, and from Lake Huron to Fort Franklin, on the Mackenzie River, /3. Columbia. 

 Douglas, — A very polymorphous plant, as Willdenow well observes, varying in the height of the stem, in 

 the entire or serrated leaves, and in the greater or lesser depth of the serratures. One specimen which I 

 possess, tallying with the S. Canadensis of Herb. Banks., is from Boston, and has much more numerous leaves. 



* A genus, Lessing observes, only differing from Aster in its rounded, many-ribbed, not piano-compressed and 

 bicostate achenia. but easily distinguished by the habit, and by the colour (yellow) of the flowers — In the determination 

 of the species, attended perhaps with more diflSculty than that of the species of any other genus, save its near ally, 

 AsteTj I have been greatly aided by Dr. Boott. As the Hortus Kewensis was the authority for a considerable number 

 of species, the comparison of specimens with the Banksian Herbarium, where original specimens are preserved, became 

 essentially necessary : and this Dr. Boott has most kindly accomplished for me. Still, as to the limits of the species, or 

 the value of the relative characters, I dare scarcely offer any opinion. 



VOL. II. 



