18 PITTONIA. 
12. A. PENICILLATA. Erect, slender, a foot high, sparingly 
branehing, all the primary and most of the secondary branches 
in opposite pairs ; sparingly setulose-hispid : racemes naked 
exeept a few braets at base: calyx slightly acerescent, spread- 
ing in fruit: corolla very small: nutlets ovate-oblong, a line 
long, earinate from a little below the apex around it, and down 
the elongated, nearly linear but open and excavated scar; 
rugule transverse, acute, beset with minute short set» in 
numerous penicillate tufts of three or four. 
Donner Lake in the Sierra Nevada, Cal., August, 1883, col- 
lected only by the writer. 
In the character of its nutlets this is much like A. humis- 
trata, although the scar is different, and the oppositely branch- 
ing habit of the plant is altogether peculiar in the genus. 
13. A. AusrINX. Erect, slender, a span high, simple or 
sparingly branching, almost glabrous, except the calyx which 
is somewhat villous: leaves narrowly linear, much elongated 
(13—3 inches); calyx not accrescent: nutlet light colored, 
ovate-acuminate, more than a line long, strongly carinate on 
both sides, the dorsal keel and margins surmounted by stout 
prickles which, from midway upwards are strongly glochi- 
diate, body of nutlet otherwise densely tuberculate; scar 
supra-basal, sharply triangular, excavated. : 
A single specimen, collected in Butte County, Cal., 1883, by 
Mrs. R. M. Austin: species bearing considerable resem- 
blance to A. Echinoglochin, but nutlets of extremely different 
and very peculiar character. 
4— + Spicale racemes bractless and more dense. 
++ Corolla large, i. e., 3—6 lines wide. 
14. A.ScovLERL. Erect or ascending, a foot high, pubes- 
cence as in the last: corolla 3 lines wide: calyx-segments 
erect in fruit and not acerescent: nutlets ovate, 3-line long, 
dark eolored, earinate on both sides at apex and ventrally 
