NOVITATES OCCIDENTALES. 5 
proliferous rootstocks so multiplying underground as to 
form broad masses. The flowers are strikingly large and 
showy. The species is, of course, an analogue of P. glandu- 
losa of the Pacific Coast, though very distinct. In habitat 
it seems restricted to Colorado and New Mexico; the P. 
jissa, Nutt., of Montana and Idaho being more like glandu- 
losa, though also very likely quite distinct from both. 
Potentilla ambigens. Stout and tall, 2 feet high or more, 
the stem and petioles densely villous-hirsute: radical leaves 
firm, erect, a foot long, of about 5 pairs of oblong or linear- 
oblong deeply and regularly serrate leaflets, two inches long 
Or more; cauline similar, but smaller: flowers small, yellow, 
in a loose and ample cymose panicle. 
Moist meadows along Bear Creek, above Morrison, Colo- 
rado, July, 1889: associated with P. arguta and Pennsyl- 
vanica, and apparently rare; at all events, during all my 
former years of residence in Colorado I met with no such 
plant. 
PoTENTILLA PLaTTENsSIs var. (?) leucophylla. Lowest 
leaves nearly as in the type, though more pubescent, the 
succeeding and somewhat larger ones, white with a dense 
and fine silky tomentum which extends in a degree to floral 
leaves and calyx. 
Independence Lake, in the Sierra Nevada, Calif., 26 June, 
1892, C. F. Sonne. Certainly a most remarkable plant, in 
view of the abrupt transition from the pale green and nearly 
glabrous leaves of true P. Plattensis to such as are as white- 
tomentose as ever seen in any member of this genus. A 
plant almost like this is in Mr. Pringle’s collection of 1881, 
from somewhere towards Mt. Shasta. 
Potentilla Micheneri. Stems only 6 or 8 inches high, 
tufted from a strong tap-root: leaves linear, 3 or 4 inches 
long, with about 15 pair of crowded but not imbricated small 
leaflets, these 5 to 7-parted into oblong entire obtuse segments: 
younger leaves and reddish stems somewhat villous; cyme 
terminal, contracted, or even compact when young: petals 
