Notes on trees and shrubs in the vicinity of Washington 
W. W. AsHe 
There are a number of trees and shrubs which are apparently 
not recorded* as occurring in the vicinity of Washington, D. C., 
but which the writer has collected within distances which should 
allow inclusion in its flora. Several interesting forms of Ame- 
lanchier are included in this number and also several species be- 
longing to various other genera. 
SPECIES AND VARIETIES OF AMELANCHIER 
The catalogue of the Washington Botanical Club credits four 
species of Amelanchier: A. canadensis (L.) Medic. (A. Botryapium 
Aut.), A. laevis Wiegand (A. canadensis Aut.), A. oblongifolia (T. 
& G.) Roem., and A. stolonifera Wiegand (?A. nantucketensis 
Bicknell). A. laevis is not common near Washington, but another 
associate of A. canadensis, which McAteet has seemingly correctly 
referred to A. intermedia Spach, is frequent; this form so inter- 
grades with A. canadensis that it should probably be regarded as a 
variety of that species. In addition to these A. sanguinea (Pursh) 
DC. occurs along the Potomac at Great Falls, Virginia, and grow- 
ing with it are two other unrecorded forms. The first of these is 
here proposed as new; the second seems to be a hybrid or of hy- 
brid origin and approaches A. oblongifolia var. micropetala Robin- 
son,t the hybrid origin of which has already been suggested by 
Wiegand.§ Robinson’s variety is here raised to specific rank and 
the form in question referred to it as a variety. 
Amelanchier canadensis intermedia (Spach.) comb. nov. 
Amelanchier intermedia Spach, Hist. Veg. Phan. 2: 85. 1834. 
Differs from the type in its smaller and usually less pubescent 
leaves, which are slightly bronze when unfolding; and in having 
* The 25 ogi in question are not mentioned in the Botanical Club's letter press 
ca n Ward’s Guide to the flora of Washington and vicinity; in any of the 
five eiplements to that a or, seemingly, in any subsequent publication. 
tT Bio hington, Bull. 1: 79. 1918. 
t ches 10: beter 1908 
§ Rhodora 14: 133. 1912. 

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