474 CocKERELL: NortTH AMERICAN SPECIES OF HYMENOXYS 
variety as meaning something which appears to possess distinctive 
racial characters, and yet is not thoroughly established (in human 
knowledge, not in fact!) as a subspecies. As we know more, 
some such “ varieties’? will be reduced to forms, mutations or 
synonyms, while others will rank as subspecies or even valid 
species, 
Following this plan, the Assiniboia plant (taking the Wood 
Mountain plant as the type) may stand as var. Macouni. The 
type sheet is in the herbarium of Dr. E. L. Greene. The others 
are in herb. Mo. Bot. Garden and U. S. Nat. Museum. 
“ Hymenoxys Richardsoni ligulaeflora (A. Nelson) 
Hymenopappus ligulaeflorus A. Nelson, Bull. Wyoming Exper. 
has, 25 5.135... 1896. 
Originally described as Hymenopappus ligulaeflorus, this was 
later transferred to Picradenia by its author (cf. Bull. Torrey 
Club, 25: 378. 1898). Professor Nelson has very kindly 
allowed me to study the type specimens. The characters of this 
plant have been set forth above, in the table on page 470; the fol- 
lowing material is referred to it: 
Wyominc. — Plains near Laramie Peak, A. Nelson; North 
Vermillion Creek, Sweetwater Co., July 17, 1897, A. Welson; 
Steamboat Lake, July 2, 1896, G. EZ. Osterhout; rolling plains 
between Sheridan and Buffalo, 3,500-5,000 feet, June 15 to July 
15, 1900, Frank Tweedy; on clay, saline flats, Antelope Basin, 
Albany Co., July 8, 1900, A. Nelson. These localities are in Al- 
bany and Sweetwater counties, southern central Wyoming, except 
the one between Sheridan and Buffalo, which is in north central 
Wyoming. The North Vermillion Creek plant has the long 
achenes, reddish like subspecies pumila; pappus awns hardly so 
long as in type; heads larger than typical. The Steamboat Lake 
plant agrees with the type. The Tweedy plant is variable in 
height, 8 to 17 cm., the smaller ones looking like subspecies pii- 
ita ; the achenes are ferruginous, shorter than in the type; foliage 
rather approaching subspecies pumila; inner bracts and pappus- 
scales as in subspecies igulaeflora. The Antelope Basin plant is 
like the type, but the rays are more orange; achenes long, their 
hair silvery white ; pappus white, about normal; inner bracts 
green-tipped. ; 
