488  CocKERELL: NortTH AMERICAN SPECIES OF HYMENOXYS 
in the field, it will be best to treat it as a variety; 2 ¢., as 
representing a tendency or type of uncertain taxonomic rank. 
H. floribunda arizonica, here introduced as new, may also be 
treated as a variety. It has the appearance of 17. fortbunda, but 
it is characteristic of all the material from the region about San 
Francisco Mountain that the pappus-scales are abbreviated. It 
may be, possibly, that the abbreviation of the pappus tends to pre- 
vent the seeds from travelling so far as they otherwise would, a 
character which might be of service to plants growing on elevated 
ground surrounded by desert. 
Here and there, wherever it occurs, H/. floribunda seems to 
exhibit occasional plants of low stature, say 10 to 15 cm. high. 
These are probably the result of growth in very dry spots, or per- 
haps in some instances due to early destruction of the growing 
axis by animals. Such plants must not be confused with A. Rich- 
ardsoni macrantha and the other Richardsoni types; they have 
essentially the characters of H. floribunda, — the same flowers, the 
same spreading foliage, etc. A rather extreme example is from 
Galisteo, N. M., collected by Dr. /. M. Bigelow, on the Whipple 
Survey in 1853-4. (U.S. Nat. Mus. 27458.) 
It is a singular thing that the wé/’s form in Colorado seems to 
grow always at quite high altitudes, while the floribunda proper 
in New Mexico grows lower down, notwithstanding the lower 
latitude. 
The following material is referred to H. floribunda sens. lat. : 
CoLorapo. — 1. Buena Vista, 1903, & R. Marsh. Type of H. 
floribunda utilis. 
2. Buena Vista, gravelly soil, 8,000 ft., July 27, 1892, C. S. 
Sheldon. Agrees with subsp. w#i/is as to bracts, etc., but achene- 
hairs ferruginous, 
3. Marshall Pass, 10,000 ft., August 20, C /. Baker. 
Genuine H. floribunda utilis, with white achene-hairs, etc. Dr. 
Greene had identified this as H. Richardsoni. 
4. Gunnison, 7,680 ft., July 17, C. F Baker. Just like the 
last, with silvery-white achene-hairs ; typical subsp. w/ilis. 
5. Huerfano, August 1867, Dr. Parry. Rather large heads ; 
pappus-scales ferruginous, very low-awned ; achene-hairs ferrugin- 
ous. This is not subsp. w/ilis. Very similar is a doubtful plant, 
