e 
COCKERELL: NorTH AMERICAN SPECIES OF HyMENoxys 501 
Typically this is a rather tall plant, up to 50 cm. high, much 
branched and spreading at the top, with foliage very much like 
_ that of Matricaria grandiflora, and large (15 mm. broad excluding 
rays) hemispherical heads on tolerably long peduncles. The rays 
are ample, and orange. The outer bracts are long and narrow, 
united for a short distance only, the apical part green. The inner 
bracts are narrow, long-pointed, and surpass the outer ; they show 
some tendency towards the characters so greatly emphasized in 
Macdougalia. The achenes are as usual in the genus, covered 
with hair; the pappus-scales are nearly two-thirds the length of 
the disc-corolla, with long tapering points and broad oval bases. 
In the plant from the San Luis Potosi region the pappus and hair 
of the achenes are ferruginous; in the plant from near Chalchi- 
comula they are white. The disc-corollas are broadened at the 
top as usual in the group. The plant is no doubt an annual. 
Specimens referred here are as follows: 
Mexico. — Esperanza, near Mt. Orizaba, 8,000 ft., Ais 14, 
1891, H. E. Seaton; about Chalchicomula, 8,500 ft., State of 
Pueblo, Aug. 13, 1901, C. G. Pringle ; region of San Luis Potosi, 
6,000-8,000 ft., 1878, C. C. Parry & Edw. Falmer ; Salinas, 
Zacatecas, May 4, 1892, M. £. Jones 286. The wide difference 
in the time of year of these collections is surprising. 
New Mexico ? — Three sheets of the Emory Survey, vo. 635, 
are labelled Actinella chrysanthemoides. They represent very im- 
mature and poorly preserved plants, but from the character of the 
foliage, and the large heads, the identification seems correct. 
Hymenoxys chrysanthemoides excurrens var. (vel. subsp.?) nov. 
Well-developed plants fully 60 cm. tall, of laxer growth, with 
olive-green foliage ; both outer and inner bracts broader, the inner 
much like those of HW. chrysanthemoides Osterhouti; heads not 
quite so large, and not so convex. (PLATE 22, FIGURE 3.) : 
The type sheet is from Yuma, Arizona, 1881, G. R. Vasey, in 
U.S. Nat. Museum. Precisely the same thing is from Fort Yuma, 
San Diego Co., Calif., Feb. 1889, S. B. & W. F. Parish, in herb. 
Cal. Acad. Sci. Both were labelled odorata, and the plant does 
in fact offer a transition towards subsp. multiflora (P. odorata 
auctt.). A plant collected by Palmer in Arizona, in 1876 (locality 
Not stated), has all the appearance of excurrens, but heads (excl. 
