256 PITTONIA. 
the beautiful characters of the achene. Few if any Ameri- 
can species are so much like B. cernua in mode of growth; 
yet it is perhaps one of the last which I should think of re- 
ferring to that, in view of the difference in the achenes. 
VB. CILIOLATA. Stoutish, erect, simple, a foot high, corym- 
bosely oligocephalous at summit, the terete stem glabrous: 
leaves divaricately spreading, 3 inches long, narrowly lan- 
ceolate, acuminate, subpetiolate, rather closely and saliently 
serrate except along the linear liguliform petiolar base, this, 
as also the whole margin between the serratures, scabrous- 
ciliolate: heads large, hemispherical, terminating naked and 
rather short peduncles; bracts of outer involucre narrow, re- 
flexed, not much longer than the inner: rays none: disk- 
corollas with short tube and shorter subcampanulate limb, 
the whole surpassed by four subequal stout and strongly 
aculeolate dark-brown awns, these more than half as long 
as the little compressed strongly 4-angled (but not corky- 
angled) dark-brown achene. 
This species, exceedingly well marked both as to foliage 
and fruit, [have seen only in the U.S. Herbarium. The speci- 
mens were collected by A. H. Crozier at Grand Rapids, 
Michigan, 1 Sept., 1886. 
/ B. PRIONOPHYLLA. Rather slender, a foot high or more, 
branching from the base, scabrous-pubescent: leaves from 
almost linear to narrowly linear-lanceolate and elliptic-lan- 
ceolate, rather deeply and sharply serrate, 23 to 4 inches 
long, sessile but scarcely connate: headson long and slender 
naked or bibracteate peduncles, hemispherical; bracts of 
outer involucre spreading, small, seldom surpassing the 
rays; these numerous, 10 to 15, rather short, light-yellow: 
disk-corollas short, the tube and short subcylindrie limb 
