506 CocKERELL: NortTH AMERICAN SPECIES OF HYMENOXyYS 
No other material has been seen. There is I think no doubt 
whatever that the plant is an annual. 
‘ Hymenoxys chrysanthemoides Mearnsi subsp. (var. ?) nov. 
The type of this (U. S. Nat. Mus. 27473) is from Dog Spring, 
New Mexico, May 26, 1892, collected by Dr. £. A. Mearns on 
the Mexican Boundary Survey. It is a many-stemmed densely 
leafy little plant, forming a tuft about 10 cm. high and twice as broad. 
The foliage is normal for the group, except for its abundance, but 
there is agood deal ofshort white almost scurfy hair about the stems 
and on the involucres. The heads (excl. rays) are about 8 mm. 
broad, quite convex, with well-developed broad rays ; outer bracts 
broad, united nearly half-way up, green-tipped ; inner bracts very 
broad ; hair of achenes pale shining ferruginous ; pappus-scales 
normal for the group, more or less ferruginous. This is a more 
densely tufted plant than subsp. mza/tflora, and has larger heads. 
The plant is leafy right up to the flowers, which are very numer- 
ous. The pappus-scales are much shorter than the disc-corollas. 
(PLATE 23, FIGURE 2.) 
Quite provisionally, I refer also to subsp. Mearns? a series of 
small plants having the heads no bigger than those of true mu/ti- 
flora, and the peduncles frequently elongated. They do not seem 
to be exactly mu/tiflora, but rather between it and Mearnsi. The 
distribution of these plants seems to show that the zz/tiflora type 
does invade the territory of the tall mountain form, and this may 
certainly be taken as an argument for the genuine specific distinc- 
ness of the two. On the other hand, it could be suggested that 
these small plants are but conditions of the tall one, similar to the _ 
small examples of 1. floribunda. If the latter supposition is true, 
the plasticity of the organism is wonderful. The small plants just 
referred to are: 
New Mexico.— Mangas, April, 1897, 7. K. Metcalfe; neat 
Cliff P.O., in the Gila Valley, approx. 4500 ft., July 12, 1900 
fa Sig bf Wouton : below Silver City, 5700 ft., ins 6, 1900, £. 
Wooton. 
Arizona.— Agency, Mohave reserve, April 1, 1876, £. Pal- 
mer; San Simon Valley, July 27, 1894, 7. W. Toumey. 
