24 PITTONIA. s 
CHRYSOTHAMNUS HUMILIS. Depressed shrub, only 6 or £ 
inches high, forming broad compact tufts much branche 
from the base, in no part tomentose, but somewhat cine e: 
ously puberulent throughout: leaves erect, 1 inch long ot 
more, linear or narrowly oblanceolate, acute: heads in small 
clusters at the ends of the short branchlets, subsessile, 4 
5 lines high: bracts of the involucre about 3 in each v 
tical rank, the outermost lanceolate, green and folia 
but short, lanceolate, the others with green midnerve a 
greenish rather obtuse tips which are delicately some 
ciliolate: flowers about 5 in each head, cream color, 
rather slender corolla 5-toothed: slender style-tips well 
serted: achenes nearly linear, angled and pubescent. 
Plains of the Truckee River, Nevada Co., Cal., Mr. So 
Probably local, and as near C. Vaseyi as any other. 
Ho 
CHRYSOTHAMNUS COLLINUS. Shrub with the aspect 
Bigelovii, though not tomentose, only very obscurely 
reous and notably gummy: leafy branchlets slender, flexu: 
ous, bearing few fastigiately clustered subsessile heads 
summit: leaves very narrowly linear, acute, 1 inch long or 
more: heads } inch high; bracts carinate, 3 or 4 in each ver- 
tical rank, the outer lanceolate, acuminate, the inner nearly 
linear, cuspidately acuminate, the tips of all erect, scarcely 
herbaceous, the margins arachnoid-ciliate: achenes densely 
silky. 
Plentiful on the slopes of rocky hills about Rock Springs, 
Wyoming; differing essentially from C. Bigelovii in its invo- 
lucre and achenes. 
CHRYSOTHAMNUS LINIFOLIUS. Tufted woody stems erect, 
slender and flexible, about 3 feet high, fastigiately branch- 
ing above, the leafy flowering branches white, glabrous and 
striate: leaves suberect, narrowly lanceolate, very acute, 3- 
nerved, about 1 inch long, slightly fleshy, glabrous, tl 
margins minutely scabrous-serrulate: heads many, in 
