CocKERELL: NorrH AMERICAN SPECIES OF Hymenoxys 485 
Flora has already accustomed us to this way of regarding the 
matter. I have accordingly placed dennis at the head of the 
canescens combination, although the requirements of priority, as I 
understand them, oblige us to write 7. canescens and H. canescens 
biennis. In Dr. Greene’s treatment of Picradenia, P. canescens is 
placed far from P. diennis, but it appears that Dr. Greene did not 
know the real P. dfennis. 
The essential characters of the true 7. canescens are as follows : 
Stature small, height usually from 8 to 18 cm.; large heads like 
biennis, 15 mm. broad excluding rays; rays about as in dennis, 
but hardly so large as in the type of that subspecies ; plant de- 
cidedly hoary, but hardly more so than Jones’ diennis from grade 
south of Rockville ; bracts about as in subsp. dennis, inner not or 
hardly surpassing outer; pappus-scales short, hardly half length 
of disc-corolla, broad, pointed but not at all aristate ; habitat at 
comparatively high altitudes in Nevada. The stems are one or 
several, not especially slender, reddish. The plant may be peren- 
nial, but if so, so is subsp. dennis. 
I have seen H/. canescens from only two localities : 
1. E. Humboldt mts., Nevada, 9,000 ft., Aug. 1868, Sereno 
Watson. Pappus-scales and hair of achenes entirely ferruginous ; 
leaf-segments a little broader than in the Mt. Gabb plant; basal 
part of disc-corollas glandular. 
2. Rocky slopes, Mt. Gabb, Palmetto R., Nevada, 3,000-9,000 
ft., May—Oct., 1898, C. A. Purpus. One stem is 21 cm. tall. 
Pappus-scales white, varying to ferruginous in same head; some- 
times about the basal half ferruginous, the rest yellowish-white. 
These plants are more hoary than those collected by Watson. 
~“ Hymenoxys floribunda (Gray) 
Actinella Richardsonit var. floribunda Gray, Pl. Fendl. rot. 
1849. 
Picradenia floribunda Greene, Pittonia, 3: 272. 1898. 
Described originally from ‘‘around Santa Fé,”’ New Mexico. 
Heller and Greene have considered it a valid species, and I cannot 
doubt the correctness of this opinion. It maintains its characters 
where I have seen it in New Mexico, covering, or rather dotting 
Over, many acres of ground; and the tons of the Colorado plant 
