NEW OR CRITICAL SPECIES OF ACER. 7 
spinulosely serrulate: palee of pappus of oval outline, a line 
long, glabrous and straw-colored, but strongly appressed-aca- 
berrulous, the barbellulate awn about 14 lines long. 
Known in only a single specimen; this obtained by myself, 
somewhere on the plains of Fresno Co., California, in April, 
1884, and now in the herbarium of the California Academy. 
M. consuGENs. Leaves shorter than in the foregoing, deeply 
pinnatifid, the segments oblon g-linear, obtusish, spreading: 
scapes many, 8 to 12 inches high, heads ovoid: achenes slender, 
24 lines long, between columnar and fusiform, all being slightly 
narrowed under the summit as well as above the base, the outer 
ones very rarely villous, but always smooth (lacking the ribs), 
the others brown and scabrous-serrulate on the ribs; pappus- 
paleæ 12 lines long, ovate-oblong, acute under the awn, glabrous, 
ultimately of a dark dull-brown, the awn paler, 2 lines long. 
Collected by the writer, at Byron Springs, California, 24 March, 
1889, and near Midway, Alameda Co., 3 May, 1895. This as to 
foliage and habit closely enough simulates M. melanocarpha, 
and its pappus is almost as nearly black, but the achenes are of 
quite a different character, in respect to which it makes an ap- 
proach to M. attenuata. 
M. LEUcocaRPHA. Decumbent scapes 3 to 7 inches high, at 
flowering fully equalled by the slenderly pinnatisect foliage; in- 
volucres oblong or ovoid; achenes scarcely 2 lines long, linear- 
fusiform, all glabrous, chestnut-color with darker linear flecks, 
the ribs only very delicately scaberulous ; pappus much longer 
than the achene, the paleæ oblong-lanceolate, of a clear shining 
white, glabrous, the awn somewhat longer, barbellulate. 
My type of this handsome species is a plant collected at 
Woodside, San Mateo Co., California, 4 May, 1902, by Mr. C. 
F. Baker, and to be distributed by him under n. 808. I also 
provisionally refer to the same, a sheet of my own collecting at 
Byron Springs in the interior of the State as long ago as 24 
March, 1889. This differs from the type only in having slightly 
villous paleæ. Yet another sheet obtained by me near Midway, 
