20 PITTONIA. 
tained in the San Rafael Mountains, Santa Barbara Co., Calf, 
in 1886, by Mr. John Spence. It seems to bear the general 
marks of that group of perennial species of which Z. ramo- 
sissima is assumed to be the type; yet it is extremely different 
from the others in several respects. 
P. EREMOPHILA. Allied to the last, larger and coarser, with 
more branched and straggling stem, equally thin leaves, the 
whole herbage green and almost glabrous; the stems minutely 
and sparsely hispid with deflexed hairs, the ample and pinnatifid 
obtusely toothed leaves merely strigulose under a lens: branch- 
ing of the upper part of the stem divaricate, the naked- 
peduncled inflorescence of 2 or 3 divaricate branches each with 
usually a pair of spikes, the rachis and sepals hispid, the latter 
with elliptic-lanceolate tips narrowed to an almost filiform base 
but of equal length: corollas nearly funnelform, the short limb | 
little exceeding the sepals; stamens exserted: capsule oval, 
glabrous below the middle, appressed-pubescent above it, matur- 
ing usually 4 long and narrow somewhat elliptical seeds. 
West Humboldt Mountains in the Nevada desert, collected 
only by the writer, August, 1894, also in King’s Cañon, neat 
Carson, 30 June, 1902, by Carl F. Baker, n. 1198; but these | 
specimens not quite true to the West Humboldt type. 
The species next following are variously allied to such annuals 
as P. Aispida and its kindred. 
P. CICUTARIA. Annual, erect, not widely branching, 1 to ?- 
feet high ; leaves rather ample, closely pinnate, the pinnæ ses- 
sile, those of the lowest incisely cleft to the middle, of the upper 
merely incise-toothed, all lobes and teeth acute, the whole herb- 
age sparsely hispid, and with short soft dense indurnent under- 
neath: spikes in threes, rather strict, though emphatically 
circinate at summit, corolla as in P. tanacetifolia but paler; 
stamens exserted: seed not known. . 
At Knights’ Ferry, on the Stanislaus River, middle California, 
9 April, 1895, collected by my pupil, F. W. Bancroft. The 
