STUDIES IN THE CowrosrirE.—III. 
The several homochromous asteraceous plants which I 
shall next take into consideration are among those left un- 
mentioned in the course of my discussion of the Aplopappus- 
Bigelovia series of Asa Gray. The first of them is a Mexi- 
can plant of somewhat recent discovery, namely, 
CHRYSOPSIS NIVEA. Aplopappus niveus, S. Wats., Proc. Am. 
Acad. xxiii. 227 (1888).—Of gravelly banks or borders of 
streams in the mountains of northern Mexico; every way a 
hrysopsis, and of the Ammodia section of the genus not- 
withstanding its having ray flowers; but the pubescence is 
rather that of certain southeastern species of typical Chry- 
sopsis. The monocephalous and pedunculiform branches 
are peculiar for this genus, though in the Floridian C. 
oligantha there is a near approach to this condition. 
Dr. Watson's insecure command of right terms in descrip- 
tive botany betrayed him into the mistake of beginning his 
account of this species by the mention of a “ caudex.” The 
plant has no such organ. The slender stems arise from an 
apparently rather deeply seated root, quite as in the related 
C. rudis of Californian stream banks. 
Hazarpia Wuitneyi. Aplopappus Whitney’, Gray, Proc. 
Am. Acad. vii. 353 (1868).—This is the Sierra Nevada rep- 
resentative of the Coast Range and seaboard genus Hazar- 
dia—a genus of most excellently ‘marked habit, and one 
1 The reference here is to certain papers under the title of Observations 
on the Compositz, published in the second and third volumes of ERYTHEA, 
1894, 1895. 
