290 PITTONIA. 
as the body: pappus-bristles in the male somewhat spat- 
ulately and not widely dilated at summit. 
Mr. Rydberg has defined no species to which he would 
apply the above name. The equivalent which he cites, the 
A. dioica var. congesta of Gray, is an aggregate, made up of 
at least two very different things, an alpine plant of Colo- 
rado, and another belonging to the hot dry desert regions of 
the far Southwest. But Mr. Rydberg, while taking the 
name rosulata from Gray’s partial characterization of the 
alpine one, cites, as herbarium types of his species, the 
other. Had he described either one, we should not have 
been in doubt as to which should bear the name. I apply 
it to the plant of Arizona, which is here for the first time 
described. The best dried representation of it which I have 
seen is in the U. S. Herbarium, from near Belmont, Arizona, 
collected by Mr. Toumey in 1892. In the field I was formerly 
familiar with it. 
A. RECURVA. Stout and low, apparently not ceespitose ; 
the few stolons extremely short, but bearing a dense tuft of 
rather large leaves, these an inch long or more, narrowly 
spatulate, acute, somewhat closely conduplicate and falci- 
form-recurved, hoary-tomentose, and permanently so on 
both sides: heads 8 to 6, sessile and glomerate at summit of 
the stem, this 1 inch high or more: bracts of the involucre 
(female only) with elliptic-oblong acutish milk-white tips. 
Known only from the vicinity of Flagstaff, northern 
Arizona, and in female individuals only. 
A. MARGINATA. Low, cespitose, the stolons short: leaves 
spatulate or oblanceolate, obtuse, mucronate, the mucro de- 
ciduous, upper surface green and glabrous at least in age, 
but the dense white tomentum of the lower face usually 
showing as a narrow white margin to the leaf as seen from 
above: stems 2 inches high or more, leafy-bracted: 10- 
volucre not very woolly, the tips of its bracts in the female 
plant from oblong-obovate and obtuse in the outer series, to 
