60 PITTONIA. 
hirsute to the middle, the body of the involucre with a few 
short stiff dark prickles beneath the main ones: beaks stout, 
short-hispid up to the very short incurved tips. 
Sandy banks of the Columbia River, Klickitat Co., Wash- 
ington, Oct., 1893, W. N. Suksdorf, n. 1583, distributed as 
X.strumarium. Remarkable for the variability of its foliage. 
X. AFFINE. Size of the preceding, the inflorescence equally 
scattered, the sparse roughness of the stem strigose: leaves 
variable but all more or less distinctly deltoid, none lance- 
olate or rhombic, the uppermost broadly ovate-trigonous 
with truncate or subcordate base, though abruptly narrowed 
to the petiole, all doubly dentate, but none lobed, the sur- 
face sparsely strigulose-scabrous and minutely resinous- 
dotted : fruiting involueres 8 lines long, narrower than in 
the last, with only about half as many uncinate prickles, 
these more slender, far less hirsute, the body of the involucre 
between them bearing rather many short black truncated or 
gland-tipped aculez ; beaks more slender, less hispid and 
with longer iurat tips. 
Habitat of the preceding species, and by the same col- 
lector, distributed without a specific name, under n. 1584. 
Distinguished from X. varium by the appressed hairs of the 
stem and very different fruit. 
X. SILPHIIFOLIUM. Stem stout and tall, glabrous and 
purple-dotted below, strigulose towards the summit: large 
leaves from lanceolate-deltoid to deltoid-ovate, 4 to 8 inches 
long including the petiole, not at all lobed, but very evenly 
coarsely and doubly dentate or serrate-dentate, the base 
either almost truncate or abruptly tapering to the petiole, 
the surface sparsely muricate-scabrous and resin-dotted : 
fruiting involucres oval, 1 inch long or more, densely echi- 
nate with long prickles which are strongly and retrorsely 
hirsute, especially dorsally, up to the long naked horny 
tip, this somewhat doubly (or circinately) uncinate and fish- 
