Macbride — Various American Spermatophytes 55 
Rhododendron Warrenii (A. Nels.), comb. nov. Azaleastrum 
Warrenii A. Nels. Bot. Gaz. lvi. 67 (1918). 
This species is at once distinct from R. albiflorum, its nearest 
relative, by virtue of the glandular-ciliolate essentially glabrous 
leaves. Rhododendron is here, of course, taken in its more compre- 
hensive and as it is believed much more desirable sense. Anyone 
so situated that he can examine living material of the oriental 
section Tsutsutsi can hardly fail to discard completely the persist- 
ence of the leaves as a generic character; for in this section there 
are species which although in all other characters Azaleas yet have 
persistent leaves. Horticulturists, who have to do only with cer- 
tain selected species, may feel it convenient to retain Azalea and 
other segregates, but from the standpoint of sound botanical | 
taxonymy Rhododendron in its more comprehensive sense is clearly 
more natural and for purposes of classification more definite. 
ARCTOSTAPHYLOS TOMENTOSA (Pursh) Lindl. A. columbiana 
Piper in Piper and Beattie, Fl. N. W. Am, 279 (1915). 
In a note accompanying the publication of A. columbiana there 
occurs the following remark: ‘‘ This is the common northern man- 
zanita that has usually been referred to A. tomentosa Lindl. but 
the type specimens of that species are, according to Miss Alice 
Eastwood, from Monterey Bay, California, and are identical with 
A. vestita Eastwood.” Piper seems to have regarded the fact that 
_ the original specimen of A. tomentosa came from Monterey as 
ishing sufficient justification for separating the northwestern 
form as a distinct species. At any rate he does not point out any 
differences between the Californian and Washington plants nor 
does he bring out any distinctive characters in his meagre descrip- 
tion. However, it happens that this point is immaterial in this 
imstance because Miss Eastwood has erred in her location of the 
type region of A. tomentosa, the species having been based by 
h upon material secured by Menzies on the northwest coast 
of America; cf. Pursh Fl. Am. Sept. i. 282 (1814). Accordingly 
the common manzanita of the northwestern coastal region may 
continue to be known as A. tomentosa. Both Abrams, N. A. FI. 
xxix. 97 (1914), and Piper, 1. c., give the range of this plant as ex- 
tending south through the coast ranges of California but the 
former recognizes Miss Eastwood's A. vestita which he distinguishes 
by the exfoliating bark of the older branches. This latter species, 
