NEW OR CRITICAL SPECIES OF ACER, 15 
flowering scapes and almost equalling the fruiting ones, these 6 
to 10 inches high: heads round-ovoid, less than 4 inch high: 
achenes 1} lines long, short-columnar inclining to turbinate, the 
outer villous somewhat in lines, the others smooth, even the ribs 
not perceptibly scabrous under an ordinary strong lens; paleæ 
of the pappus 1 line long, slenderly subulate-lanceolate, remotely 
serrate-toothed, very thin, the delicate awn nearly 2 lines long, 
merely scaberulous, the whole pappus chestnut-brown. 
Near Byron Springs, Calif., 24 March, 1889, collected by 
myself ; also near Chico, ©. C. Parry, 1881. 
M. CAMPESTRIS. Near the preceding, like it in size, habit 
heads, etc., but leaves less narrowly pinnatisect: achenes also in 
size and form much the same, rather larger, but more villous, 
the outer with thickened ribs obscurely roughened, those of the 
inner minutely but very saliently spinulose-serrulate ; the pappus 
distinctive, consisting of nearly white ovate-lanceolate entire 
glabrous palew of a line long, and a tawny barbellulate awn 
somewhat longer. 
The type is from Byron Springs, Calif., 24 March, 1889, col- 
lected by the writer. Sufficiently at agreement with it is a sheet 
of specimens from the same tract of interior plains further 
south, collected 28 March, 1886, by Dr. T. J. Patterson. I hesi- 
tate to refer to it a plant from Stony Creek in the Santa Lucia 
Mountains, May, 1897, collected by Miss Eastwood; for its 
pappus-palex are shorter, and are serrate-toothed, as in M. Bige- 
loviť (i, e. my former M. intermedia). 
M.cognata. Allied to M. acuminata, but smaller in all its 
parts, the decumbent-scapes slender, 3 to 6 inches high: involu- 
cres narrowly turbinate: achenes only 2 lines long, linear- 
fusiform, chestnut-brown, the ribs only delicately scabrous- 
serrulate; pappus 6 lines long, the paleæ linear-lanceolate, 
loosely appressed-villous both externally and within, tapering 
to a barbellulate awn of only about 2 lines’ length. 
Known only as collected by myself on the plains of the inte 
