CocKERELL: NorTH AMERICAN SPECIES OF Hymenoxys 465 
C. Plant when well-developed 36 cm. high, similar in mode of growth to the last 
group; stems and foliage a lively green ; basal leaves up to about 7 cm. 
long, some entire, but always some divided into about five broad- pone 
segments; bracts light green; rays brilliant orange; pappus sc 
long-acuminate. (Burro Mountains, New Mexico. #1, Mua 
D. Plants of the arid southwest, usually in the mountains, with the pappus-scales 
always very short, often truncate or subtruncate 
I. Tall and bushy, with very numerous rather sunall heads ; rays inconspicuous, 
but the disc-florets prominent and bright orange; pappus et short ; 
va leaves all simple and grass-like. (Southwestern New ss and 
Arizona. ) ff. Rusby 
Heads usually quite large ; oes spreading above; rays conspicuous. 2. 
2. Heads (excl. rays) only about 10 mm. broad; outer bracts united about 
alf-way u (Organ Mountains, New Mexico. ) Hf, Vaseyt 
Heads colsidetahity ee usually less numerous ; plant taller than the 
last, aieer Me less leafy. 3: 
3. Pappus-scales p ferruginous, with a sort of ae tint ; rays com- 
paratively narrow. (Mohave district of California. ) Hi, Cooperi. 
Pappus-scales normally white ; rays broad. pe Arizona. ) 
Coopert Grayt. 
Plant with a single rather slender stem, rather like H. canescens biennts ; 
pappus silvery-white ; rays narrow. (Grand Cation of a colorado. ) 
Coopert tee 
E. Moderate-sized apparently perennial plants, not over 36 cm, hi h 
material seen ; heads fairly large, but not over 13 mm. broad (excl. wha : 
ted 
I. Pale and canescent; heads (excl. s) 10-13 mm. aueiee: cauline 
leaves broader and more lobed Gua in the next. (Arizona, 2,280 m. ) 
fT, subintegra. 
oa aataces heads (excl. rays) 8-10 mm, diameter; pappus- 
sca so long as in the last. (New Mexico. A. olvwacea. 
F. Tall suas dwarf) plants with one or few stems, and LINee hy large 
eads ; some apparently biennials ; pappus-scales at least pointed 
I, Pappus-scales short, not over half length of disc- SE not at all 
aristate. : 
Pappus-scales long-pointed or aristate. 
2. Stature low, rarely over 20 cm.; plant hoary. (Mountains of Hevela: a, 
2,400-2, Hf, canescens. 
Stature and appearance of 1, canescens biennis, about 75 cm. high ; pappus 
asin /7. canescens. (Charleston Mountains, tiers 1,800-2, 100 m. ) 
anescens Nevadensts. 
a 5. ‘ MC SE plant, with much-divided leaves, on linear segments, 
ed divergent from the stem, with a tendency to curl. aan 
are a. ) Hi. canescens bienn 
Bedoshyte: plants, tall and upright, with large heads and Le 
coarse erect foliage. + 
4. Basal leaves entire to bipartite ; leaf-segments very broad. (Colorado. ) 
1. helenioides. 
Basal leaves always divided ; leaf-segments narrower. 
