478 CocKERELL: NorTH AMERICAN SPECIES OF HYMENOXYS 
large heads and conspicuous rays, and comparatively coarse erect 
foliage. It has the characters of a mesophyte, and could be 
derived from the type of P. macrantha by the elongation and reduc- 
tion in number of the stems. The heads (excluding the rays) are 
about 12 to 17 mm. diameter. The roots are stout (up to 10 
mm. diam.), but I do not feel perfectly sure that the plant is more 
than biennial. The petioles of the basal leaves seem usually to be 
not over 7.5 cm.long. The species appears to be common in the 
region about Mt. Shasta, northern California (where it is the only 
Picradenia), and it extends practically unaltered into western 
Nevada. Further east it is replaced bya distinct subspecies. _ Its 
characters separate it sharply from the xerophytic H. canescens 
biennis. Miss Eastwood had recognized it as a new species before 
the description of P. Lemmoni was published. The following 
material is referred to H. Lemmoni: 
CALIFORNIA.— North side of Mt. Shasta, Siskiyou Co., 5000- 
gooo ft., June 11-16, 1897, H. E. Brown; Sierra Valley, June, 
1879, /. G. Lemmon ; Sierra Nevada Mts., 1875, /. G. Lemmon; 
near Edgwood, Siskiyou Co., July 28-21, 1892, Dr. E£. Palmer; 
on Shasta River, 14 July, 1876, Edw. L. Greene; near Yreka, 
Siskiyou Co., July 14, 1876, Edw. L. Greene ; journey from Wil- 
lametta to California, Capt. Wilkes Expl. Exped. 
Nevapa.— Star valley, July 21, 1876, Edw. L. Greene. 
The Mt. Shasta plant collected by H. E. Brown is about 3.5 
dm. high, perfectly glabrous, the stem pale and shining, the leaves 
strongly punctate. The lowest leaves are on rather coarse 
elongated erect petioles 6 to 7 cm. long, the blade 3 to 5.5 cm., 
pinnately cut into lobes which are about 2 mm. broad and six OF 
seven in number. The heads are ten or eleven in number, close 
together, 11 to 14 mm. diameter (excluding rays), rays lemon 
yellow and about 10 mm. long. Bracts pale yellowish green; 
outer bracts about 10 in number, united beyond the middle, basal 
two-thirds strongly thickened and subcarinate ; inner bracts broad, 
hardly surpassing outer, pointed-tipped, with more or less fimbriate 
sides. Pappus pales a little over half length of disc-corolla, long- 
acuminate but not aristate, pale ferruginous, as also is the hair of 
the achenes. The Sierra Valley plant has the outer bracts deeply 
divided, carinate, blunt, without dark green tips; achene-hairs 
