26 : PITTONIA. 
bracts of the involuere subulate-linear, moderately unequal, 
in about 3 series, their pubescence whiter and more appressed 
than that of the herbage of the whole plant: rays 50 or 60, 
of moderate width for the genus: achenes compressed, per- 
fectly glabrous, chestnut-brown. 
Along sandy beaches of the northern part of Santa Bar 
bara Co., California, Mrs. Blochman. 
CENTROMADIA PERENNIS. Stems tufted from a perenni 
root, decumbent, 6 or § inches high, sparingly hirsute w 
white hairs, the herbage otherwise glabrous: leaves 
nately pinnatifid, the segments spinescent, many small entire . 
pungently acute ones crowded on short axillary branchlets: 
outer bracts of involucre subulate-lanceolate, spinescen 
chaff of the receptacle exceeding the flowers, mucro 
ray-achenes black, obliquely triquetrous, nearly smooth, = 
beaked ; those of the disk with one or more linear soft pales. — 
Salado, Lower California, 1 June, 1898, Brandegee. 
Carduus Nevapensis. Biennial, rather slender and som 
what freely branched, 2 or 3 feet high, pale with a rat 
and strongly spinescent: expanded heads 1} inches high and. 
as broad: bracts of the involucre with triangular-lanceolate 
appressed glandless base, but tapering very gradually into a — 
long ascending or spreading spinose tip: flowers white; -i d 
of the corolla much shorter than the throat: m bes — 
triangular, somewhat cuspidately acute. cde 
Along the bases of cliffs in the West Humboldt Mountai 
Nevada, July, 1895. : Em 
AGOSERIS DASYCARPA. Pale green and Sle Ee T 
sparsely white-tomentulose throughout, except the involucre 
