274 PITTONIA. 
volucral bracts as white (varying to pink) or as brown; these 
primary groups being subdivided according to the perma- 
nency or the deciduousness of the tomentum upon the upper 
surface of the foliage. 
*Tips of involucral bracts white or pink. 
+ Leaves glabrous, or at least glabrate, above. 
A. DIOICA, Gertn. A. montana, S. F. Gray, Nat. Arr. ii. 
458. Under this name it is evident to me that two or more 
species are included even in Europe. The proper type of 
4. dioica is a low plant with long and sparingly leafy stolons, 
leaves of spatulate or obovate-spatulate outline and acute, 
their upper surface glabrous or early glabrate: bracts of the 
involuere with long and obtuse white tips. An excellent 
representation of this plant is given in Smith and Sowerby's 
English Botany, iv. t. 267. 
There is nothing to show that this plant exists in any 
part of North America; but the first four following are akin 
to it. : 
A. NEGLECTA, Greene, p. 173 supra. As I indicated when 
publishing this as new, both Barton and Darlington sup- 
posed it to be A. dioica, a view far less objectionable than. 
that of those who afterwards referred it to A. plantaginifolia- : 
It differs from its Old World homologue in its much greater 
size, much longer and less leafy stolons, different leaf-out- 
line, and in the longer and narrower often acute scarious 
tips of its involueral bracts. ; 
I described this from the plant as it appears in the vicin- 
ity of Washington, where it is a common inhabitant of open 
and rather moist grassy lands. It does not appear in our 
herbaria from more southerly stations; though in view of 
what we know of its habitat, it might be expected in mead- 
ows among the higher mountains well southward; but itis 
plentiful northward to at least southern New England. Mr. 
Bicknell obtained it on Mt. Desert Island; but it does not 
