COCKERELL: NorTH AMERICAN SPECIES OF HyMENoxys 481 
stems very slightly reddened ; outer bracts 12, deeply divided, 
basally thickened, apical part dark green and very woolly; inner 
bracts not or barely surpassing outer ; hair of achenes, and pappus- 
scales, shining but slightly sordid white ; pappus-scales extremely 
large and elongate, ending in a linear tip which is nearly equal to 
the disc-corolla. (PLATE 22, FIGURE 1.) 
Nagle’s Ranch, Arizona, 7,600 ft., Sept. 13, 1894, Marcus E. 
Jones. U.S. Nat. Mus. 234966. 
I have tried over and over again to convince myself that this 
plant is a subspecies of HY. Lemmoni, but there seems nothing to 
do but to treat it as distinct. It may very well be regarded as a 
derivative of H. Greene?, which has become adapted to a xerophytic 
existence. The character of the pappus at once separates it from 
H. Cooperi. 
~“Hymenoxys helenioides (Rydberg) 
Picradenia helenioides Rydberg, Bull. Torrey Club, 28: 21. 
1901. 
Apparently biennial; similar in type of foliage and mode of 
growth to AH. Lemmoni (not at all similar to HH. canescens 
biennis !) ; rather taller, up to 5 dm.; foliage pale yellowish-green ; 
leaf-segments much broader, of basal leaves up to 9 mm, broad, 
of stem-leaves to nearly 4; lowest leaves entire to bipartite, up to 
18 cm. long; stem strongly striate, not reddened ; involucre beset 
With white woolly hairs; outer bracts narrow and divided almost 
to base; disc-corollas only hairy at top; rays orange; hair of 
achenes, and pappus-scales, pale ferruginous ; pappus-scales long- 
acuminate, practically as in H/. Lemmont, mostly much more than 
half length of disc-corolla. The receptacle is high-conical, 
- rounded at apex; inner bracts very long fimbriate ; outer bracts 
far exceeding inner, narrow, green, straight-sided. 
I have seen only one sheet, from Sangre de Cristo Creek, 
Colorado, 7,200-8,100 ft., July 2, 1900, Rydberg & Vreeland, in 
hb. Univ. of Wyoming. This is from the original lot. The 
Species is allied to H. Lemmoni, but as far as present evidence 
$0es is quite distinct. It seems remarkable that such a striking 
Plant should so long have escaped discovery. The plant is 
evidently a mesophyte. 
