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ALNUS. 
992. A. glutinosa, Linn. Native. British. 
BETULA. 
993. B. alba, Linn. Native. British. 
B. pendula, Roth, B. glutinosa, Wallr., and B pubescens, Ehrh., 
ranged here as varieties in the London Catalogue, all occcur 
occasionally. There appears, however, considerable probability 
that we possess two truly distinct species, viz., — 1, B. verucosa, 
Ehrh., (B. alba, Koch and Babington,) of which B. pendula, Roth, is 
a condition or variety : and 2, B. glutinosa, of Wallroth and Fries, 
of which B. pubescens, Ehrh, is a condition or variety. Of these 
two supposed species, the last is the ip.ost plentiful in Yorkshire, 
especially amongst the moorlands. 
POPULUS. 
995. P. alba, Linn. Native. 
Riverbanks and hedgerows ; frequent. 
997. P. tremula, Linn. Native. 
Woods and hedgerows ; common. 
998. P. nigra, Linn. Denizen ? 
Riverbanks and hedgerows; frequent; but usually evidently 
planted. P. monilifera and dilatata are sometimes planted in 
similar situations. 
British. 
British. 
English. 
SALIX. 
999. S. pentandra, Linn. Native. Scottish. 
Riverbanks and marshy ground ; frequent, both in the central 
vale and amongst the moorlands. 
1001. S. fragilis, Linn. Native. British. 
a. S. decipjens, Hoffm. 
Hedge between Thirsk and South Kilvington ; sparingly. 
b. S. fragilis, Linn. 
Riverbanks and hedgerows ; common. 
c. S. Russelliana, Aut. Ang. 
Easby, near Richmond — James Ward. (Salictum Britannicum, 
No. 55.*) Dr. Anderssen refers this to S. fragilis. He suggests 
that the true Russelliana of Smith is identical with a distinct 
species, S. viridis of Fries. 
* Specimens of many of the Yorkshire Willows were issued in the Rev. J. E. Leefe’s “Salictum 
Britannicum.” ■ A series of notes upon these by Dr. Anderssen, the celebrated Swedish Salicetist and 
author of the “ Salices Lapponise,” may he found in the Botanical Gazette, vol. iii. p. 57 . 
