196 PITTONIA. 
i inch long, acute, spreading or a little deflexed on short 
filiform pedicels; valves with a distinct midnerve: seeds 
imperfectly biserial. 
Glenwood Springs, Colorado, 18 June, 1899, Geo. E. 
Osterhout. An elegant little species, somewhat allied to 
A. Lyallii but with excellent characters. 
The next three are segregates of A. Drummondii, in so far 
as relates to material not of recent collection and to be 
found in various herbaria under that name. The pods in 
all are erect, and the pubescence of the group is peculiar, 
consisting of hairs split to the base, so to speak, and divari- 
cately appressed. 
' A. ALBERTINA. Stems rather low (5 to 7 inches high at 
flowering), rather numerous from a much branched thick 
and rather woody caudex, all very erect and strict; herbage 
of a vivid green, wholly glabrous except some traces of a 
deeply forked pubescence on the margins of the basal lanceo- 
late leaves and their petioles: cauline leaves oblong, acut- 
ish, distinctly narrowed above the subsagittate-auriculate 
ase: flowers few, about 4 lines long; calyx short, less than 
half the length of the obovate-dilated petals, these with 
spreading limb: fruit not seen. 
Elbow River, in the Rocky Mountains of Alberta, John 
Macoun, 1897; Canad. Surv. n. 18,101. Easily distinct 
from A. Drummondii by its low stature and multicipital 
caudex. 
‘A. OXPHYLLA. Perennial, the 3 to 6 or 7 branches of the 
caudex each bearing a strictly erect stem 8 or 10 inches 
high at flowering time, much taller in fruit, the whole plant 
pale and glaucous, nearly glabrous, only the clustered 
lanceolate acute entire basal leaves with some of the divari- 
cately, appressed binate hairs of this group: cauline leaves 
