4 PITTONIA. 
A. MODOCENSE. Allied to the last, the somewhat larger 
leaves apparently as constantly 5-lobed and with lobes radiant 
rather than pointing forward, the surface not wholly glabrous, 
some soft hairs appearing along the veins in some: flowers 
rather small, sepals, petals and even the anthers green, or green- 
ish-white; sepals mostly (all the outer ones) merely oval, little 
exceeding the whitish petals, both sepals and petals sparingly 
hairy ; fruit unknown. l 
Represented by only some flowering branches, with young 
foliage, collected near the Warm Springs, Modoc Co., California, 
4 June, 1892, by M. S. Baker and Frank N utting. While the 
leaves here are almost those of A. Macounii the flowers are very 
notably different; for in both that and A. circinatum the sepals 
are narrow, elongated to twice or thrice the length of the petals, 
and are of a dark red-purple. In A. Modocense they are not only 
green, but very short for those of any maple at all. 
A New STUDY oF MICROSERIS. 
Ahough the type of this genus is Chilian, the species are 
most numerous in California. My first critical study of them 
was made in San Francisco twenty years ago. I proposed then - 
the two new species, M. attenuata, and acuminata, both of which 
have since obtained universal recognition. 
The researches of three more seasons carried on in that field 
led to the expression of views that were published in 1886, 
according to which, out of the heterogenous “ Microseris” of 
Gray’s Synoptical Flora, Calais of De Candolle, and Scorzonella 
of Nuttall were restored, and two new genera, Ptilocalais and 
Nothocalais were proposed; while for the genuine Microseris, the 
new discovery was made that its species fell into two natural 
groups, according as the palex of the pappus are triangular and 
plane, or rounded and cymbiform. In this paper I added but 
' Bull. Calif. Acad. ii, 41-55. ? 7 
