CocKERELL: NORTH AMERICAN SPECIES OF Hymenoxys 505 
sienega near Tucson, June 1881, Lemmon. This material is not 
as good as one could wish, but it seems inseparable from the New 
Mexico plant. 
, Hymenoxys chrysanthemoides Osterhouti (Cockerell) 
Picradenia odorata Osterhouti Cockerell, Bull. Colorado Col- 
lege Museum, December 11, 1903. 
The original description is as follows : 
‘‘Apparently annual, about 21 cm. high, broad and spreading, 
much in the manner of odoratz, root about 5 mm. diameter ; stems 
purplish at base, here neither wooly nor leafy, repeatedly branched, 
with cauline leaves divided into about five linear segments; heads 
numerous, with the leaves and mode of growth rather suggestive 
of Matricaria, disc convex, bright orange, about 7 mm. across, 
rays bright lemon-yellow, rather short; outer bracts divided 
nearly to base, with rather narrow but obtuse green tip; inner 
bracts longer than the outer, and rather more pointed, their shape 
recalling those of P. Davidsoni, except that they are by no means 
so large and broad; receptacle from hemispherical to broad-coni- 
cal (not narrow conical and pointed as in w¢ilis) ; disc-corollas 3% 
mm. long, widened at the top, the lobes pubescent as in odorata ; 
Pappus-scales not at all ferruginous, rapidly narrowing to a long 
awn-like point, the whole being nearly half the length of the 
corolla.” [PLATE 23, FIGURE I. 
‘‘Apishapa Crook, Otero Co., Colorado, June g, 1900 (in full 
flower), collected by Geo. E. Osterhout. The plant of Kansas 
and Oklahoma is taken as true P. cdorata. It has considerably 
smaller heads than the Colorado plant, with disc-corollas 3 mm. 
long. It also appears to flower earlier, and the color of the pap- 
pus-scales is very different. 
“ The discovery of Osterhouti nearly fills up the interval between 
odorata and Davidsoni. The only substantial differences between 
Osterhouti and Davidsoni are that the latter is certainly biennial, 
as the outer bracts the same color as the inner (in Osterhoutt 
they are conspicuously tipped and narrowly margined with dark 
green), and the inner bracts nearly twice as broad as those of 
Osterhouti. It is possible that Osterhouti may yet prove biennial, 
in which case I should consider it a subspecies of Davidsoni.” 
