RYDBERG: NOTES ON FABACEAE—III 21 
NEBRASKA: Scotts Bluffs, Rydberg 79; Belmont, Webber; 
Court House Rock, Rydberg 79a. 
NEw Mexico: Upper San Juan, McComb’s Expedition; In- 
scription Rock, Bigelow (Whipple Expedition). 
2. KENTROPHYTA VIRIDIS Nutt. This has been ignored by 
all later authors, except myself, though Nuttall pointed out 
that the green stipules were different in being distinct nearly to 
the base, more attenuate and sometimes spinulose-tipped. It 
seems to be a rare species, as I have seen only one collection 
besides the type. 
WyomInc: Platte Plains, Nuttall. 
CoLoraAbo: Palisades, Crandall, in 1898. 
3. KENTROPHYTA IMPENSA (Sheld.) Rydb. This was first 
described as A. Kentrophyta elatus, which name Sheldon changed 
to A. viridis impensus. It differs from K. montana in the elong- 
ated stems and in the long, almost distinct and decidedly spinu- 
lose stipules; from K. viridis in the stiff, spiny leaflets and in the 
lanceolate pod, 6-7 mm. long. Evidently M. E. Jones* mistook 
this species for K. montana. 
CoLorADo: Grand River Cafion, Eastwood. 
Urau: Maple Cafion, Garrett 2647; Fish Creek Cafion, 2512; 
Lost Creek, Jones 5833; Southern Utah, Parry 54; Beaver 
Valley, Palmer 122. 
New Mexico: Shiprock Agency, Standley 7850; Fort 
Wingate, Dr. Matthews, in 1883. 
Arizona: Navaho Reservation, University of Arizona. 
NeEvaApDA: Holmes Creek Valley, Watson 291; Bennett Springs, 
Purpus 6275. 
4. KENTROPHYTA TEGETARIA (S. Wats.) Rydb. Watson 
placed A. tegetarius between A. pauciflorus (Homalobus vexilt- 
flexus) and A. miser, but it is really a very close relative of K. 
montana, differing in the smaller flowers in more elongate racemes 
and in the shorter leaflets, distinctly tapering to the base as well 
as to the apex. This species seems to be confined to the East 
Humboldt or Ruby Mountains of Nevada. 
-  Nevapa: East Humboldt Mountains, S. Watson 286; Death, 
Heller 9223. 
* Zoe 3: 298. 
