158 AMENTACEiE, iQuercus. 



leaves are generally larger thanj and of a different shape from, the preceding. In the degree of pubescence 

 on the under surface of the leaves, the greatest variation appears, and the most downy kind in every parti- 

 cular corresponds with the European incana, so that I have no hesitation in considering the A, serrulata 

 (which indeed is sometimes quite glabrous) a var. of it. 



5. A. rubra (Bong. Feg. de Sitcha^ p. 44); foliis ellipticis niarginibus undique obtuse 

 lobatis lobis obtuse serrulatis subtus ad nervos praecipue puberulis siccitate subferrugineis, 

 amentis foem, jtinioribus cylindraceis, fructiferis ovatls. — A. castanesefolia. Dough Mst 



Hab. Sitcha. Bongard. Dry rocky banks of the Columbia, near the Grand Rapids, common {Douglas), 

 and below Fort Vancouver. Dr Scouler, — This is a perfectly distinct species, and well characterized by 

 Dr Bongard, who observes that it is called " Red Alder" by the Russians inhabiting the colony at Sitcha. 

 The margins of the leaves are so deeply and regularly lobed that they might almost be called pinnatifid, and 

 these lobes and the serratures are singularly blunt. There is nothing peculiar in the catkins. Indeed the 

 fructification of the different species of Alder exhibit very little variation. 



SUBORD. III. PlATANE^.. JuSS, 



5. PLATANUS. L. 



1. P. occidentalis. L,—Ph, Am. 2. p, 635. Mich. N. Am. Sylv. p. 55. t 63. 



Hab. Canada. 



+ 



SuBORD. IV. CupuliferjE, Rick. 



6. QUERCUS. X. 



1. Q. tinctoria. Bartr.—PL Am, 2. p. 629. Mich. N. Am. Sylv. 1. p. 110. t 24. 



Hab. Canada. Dr Bech. 



2. Q,. rw6m(L.); foliis longe petiolatis circumscriptione latissime ovalibus profunde 

 sinuatis lobis integvis vel subincisis setaceo-acuminatis glabris, fructibus sessilibus, cupula 

 brevissima scutelliformi squamis parvis ovatis pubescentibus, glande late ovata acute 

 umbonata. Ph. Am. 2. p. 630. Mich. N. Am. Sylv. 1./?. 125. L 28. 



Hab. Canada, from Lake Huron {Dr Todd), to the Saskatchawan and rocks at Lake Namakeen. Dr 

 Richardson, 



3. Q. Bannisteri. Mx.—Ph. Am. 2. p. 631. Mich. N. Am. Sylv. \. p, 99. t, 21. 



Hab. Canada. Dr Bech, 



* 



4. Q. oUusiloba, Mich.— Ph. Am. 2. p. 632. Mich. N. Am. Sylv. p. 37. t. 5. 



Hab. Canada. Dr Beck. 



5. Q. alba (L.) ; foliis obovato-oblongis basi attenuatis pinnatifidis junioribus utrinque 

 cano-pubescentibus adultioribus subtus pubescentibus v. glabris lobis lato-oblongis obtus- 

 sissimis V. retusis nonumquam subcuneatis petiolis brevibus, fructibus pedunculatis, cupula 

 hemisphaerica dense squamosa squamis ovatis pubescentibus, glande ovatae obtusa cum 

 urabone. Ph. Am. 2. p. 633. Mich. N. Am. Sylv. I. p. U. t. I. 



L 



Hab. Canada, to Lake Winipeg (which Mr Douglas considers its northern limit, and where it attains 

 only a height of 10^20 feet). Dr liichardson. Douglas. 



