WEST AMERICAN ASPERIFOLLE. 91 
‘branches usually trailing over the ground and flowering from 
the base. Herbage never scabrous, commonly soft pubescent, 
imparting a violet stain.—Ind. Sem. Hort. Petrop. ii. (1835) 
46, and A. DC. Prod. x. 134 : BAS Proc. Am. Acad. xx. 281, 
excluding AMBIGUI and ANOMAL 
To the genuine species dofinad by Prof. Gray, the following 
are, in my judgment, to be added. 
P. microcarpa. Villous-canescent, erect, 6—10 inches high: 
calyx little more than a line long, cleft to the middle, closed 
over the fruit, nearly sessile, some of the lower leafy-bracted: 
nutlets broadly ovate, only a half-line long, dull gray, faintly 
wrinkled, not at all granulate. 
Butte County, California, May, 1883, Mrs. R. M. Austin. 
Like a small P. canescens in aspect, but strictly erect, the 
nutlets very different and the smallest in the genus. 
P. CANESCENS, Gray, var. APERTUS. Not canescent, green 
and rough-hirsute: branches a foot or two long, procumbent, 
floriferous throughout, most of the pedicels leafy-bracted : 
calyx deeply cleft, accrescent, the triangular-lanceolate seg- 
ments stellate-spreading even before maturity : nutlets as in 
the type 
Plains of the upper San Joaquin, collected by the writer in 
1884, appearing like a very distinct species, but specimens 
from still farther southward by Parish seem intermediate ; 
and so do others of Rattan's gathering near San Jose. 
P. PniNaLEL— Echidiocarya Arizonica, Gray, Proc. Am. 
Acad. xi. 89, and Benth. & Hook. Gen. ii. 854. 
Between the nutlets of this and those of the other stipitate 
species there is no considerable difference but that of a per- 
ceptibly greater length of stipe. Their cohering in pairs is 
very far from being constant, and altogether an accident of 
those which grow on the best fed part of the plant, namely, 
the lowest part of the branches, very near the root. Here 
they are joined above midway, but higher up the union is far 
