212 PITTONIA. 
C. SPARSIFOLIA. Cleome sparsifolia, Wats. Bot. King 
Exp., 32, t. 5. 
ALDENELLA. 
The type here proposed is also of the Capparidec, but be- 
longs not to the West, but to the sandy shores of the Gulf of 
Mexico. It is the Cleome tenuifolia of Le Conte, referred to 
Polanisia by later authorities. It is equally out of place in 
either genus. It has neither the corolla of Cleome nor the 
fruit of Polanisia. 'The pod of the last named is indehiscent 
except at apex, where the ends of the valves separate and 
curve outward to emit the seeds, the valves being actually 
persistent. In ArDpENELLA the valves are, in the first place, 
marked by a peculiar and very notable reticulation; but - 
they are promptly deciduous quite as in Cleome and its 
nearer allies. Butin Polanisia the petals are unguiculate 
and stand in a line quite as in Cleome, whereas in our pro- 
posed new genus they do not, but radiate around the central 
axis; but the corolla here is remarkably irregular, two of 
the petals being of thrice the size of the other two; and all 
of them in shape are unlike those of either genus to which 
the species has been referred. 
A. TENUIFOLIA. Polanisia tenuifolia, Torr. & Gray, Fl. i, 
123. Cleome tenuifolia, Le Conte, l. c. 
SOME Rocky MOUNTAIN ASTERS. 
It will be seen that the Aster species described in this 
paper are largely of my own collecting during the last dec- 
ade in various sections of Colorado and Nevada, most of 
them having come from special localities not visited by 
other botanists; or at least visited by none who have given 
