268 PITTONIA. 
“elatior,” which, I suppose to have been a slip of the pen 
for var. elata, Torr. & Gray. But I do not consider it 
identical with what Torrey and Gray had in view under 
that name. Theirs was an Oregonian plant; apparently 
synonymous with Nuttall's B. quadriaristata, var. dentata. 
The diagnosis is here drawn up mainly from Kellogg & 
Harford's n. 437, collected long ago, at Lake Merced, San 
Francisco. 
“ B. AMPLISSIMA. Stems stout, obtusely angled, strongly 
striate, very leafy, apparently a yard high or more and dicho- 
tomously branched, at least above: leaves 5 to 10 inches 
long, all except the uppermost deeply and pinnately 3- 
parted, the lateral segments of 4 the size of the terminal one, 
all of thinnish texture, elliptic-lanceolate and deeply incised 
or laciniate; the floral simple, somewhat hispid-ciliate at 
base: bracts of outer involucre 14 to 3 inches long, deeply 
incised like the foliage, spreading widely and many times 
surpassing the 10 or more comparatively small rays: disk- 
corollas very short, greatly surpassed by the awns, and the 
limb longer than the tube: achenes olive-green and striate, 
mostly 2-angled and much compressed, some 3-angled: 
pappus of 2 awns, or 1, or sometimes none at all, always 
when present retrorsely barbed, but the margins of the awn- 
less achenes with aculex taking both directions. 
This is a most remarkable Bidens, known to me only as 
collected by Mr. John Macoun on the Lomas River, Van- 
couver Island, 12 August, 1887, and distributed under the 
name B. bullata. I judge it to be gigantic among species 
of this group; and by its large divided leaves, its exagger- 
ated outer involucre, and by the peculiarities of its achenes, 
it seems to connect with other groups of Bidens, as also with 
with Coreopsis. 
