24 
25. Bisulcati. This group forms a slight modification of the 
Ocreati hardly worth separating from it. The species are tall, 
while the Ocreati are low, and the pods are bisulcate ventrally and 
pendent mostly, presaging the intrusion of the suture in the Galegi- 
formes. A. bisulcatus abounds on the Plains and mountain valleys 
from the Saskatchewan to New Mexico. A. Haydenianus frequents 
the valleys of the Great Basin and Navajo Basin. A. oocalycis is an 
aberrant species with inflated calyx from Aztec New Mexico. All 
the group belong on plains and valleys with some alkali. 
25, The Galegiformes in the first species show more differen- 
tiation in the mostly Y-shaped cross section without corrugations 
and sulcate dorsally, and broader white flowers and pods a little 
inflated, in A. racemosus of the Plains from Colorado to central Mex- 
ico, and A. scopulorum from the lower mountain gulches of Colorado 
to Utah. But A. Drummondii has a long and rugose pod with reni- 
form cross-section, and not at all inflated. This frequents mountain 
valleys from Colorado to Utah and Montana. A. Osterhouti is an 
aderrant form harking back toward the Homalobi. It belongs on the 
Navajo Basin drainage. 
27. Lonchocarpi. This group doubtless has a relationship, 
though a loose one with the racemosus part of the Galegiformes, 
being a little more aberrant than A. Drommondii, It is, like A. race- 
mosus, a group of the alkaline plains. The pods though reminding 
one of the junceus part of the Homalobi are explanate along the 
dorsal suture, while A. junceus splits at both sutures and the valves 
curl and the leaflets are phyllodia-like as in that species. A. Kai- 
bensis and Duchesnensis hark back toward junceus and inhabit 
the Navajo Basin, while A. lonchocarpus is local from western Utah 
to New Mexico and southern Nevada. The group might as well 
be placed as a branch of the Homalobi as Fere, but the tendency 
toward an impressed dorsal suture would place it here. 
28. Hamosi. This group gces a step farther in the intrusion of 
the dorsal suture and the narrowing of the pods, and runs into all 
sorts of modifications according to the varying ecological conditions 
of the hot regions that it inhabits. It connects with the Flexuosi 
through A. distortus glaber and Coahuile. The first group of these 
three species is inclined to be a little fleshy-walled when fresh 
and with uneven sides, and imperfectly 2-celled. The first species 
belongs on the prairies of Oklahoma and Texas to Mississinpi, the 
second in the barrens of the Florida region, and the third on the dry 
benches of Coahuila. The next group of species is inclined to be 
jointed to calyx but also not stipitate, is oxytropidoid and with 
pick-shaped hairs and 2-celled ascending pods. It belongs in the 
Juniper regions, A. Arizonicus on the swell south of the Colorado in 
Arizona, and A. calycosus from the Navajo Basin and Green River 
Basin of Wyoming to the Sierras and southward to the Mogollons. 
The rest of the Hamosi is without the pick-shaped hairs, and pods 
not coriaceous, with mostly Y-shaped crossezection, but 2-celled, 
mostly linear. A. Bernardinus and Orcuttianus with erect pods 
shortly stipitate belong in the eastern side of the southern Sierras in 
rather hot regions. The rest of the Hamosi have reflexed pods. 
A. drepanolobus is not stipitate and has shining pods and belongs in 
the southern Columbia Basin region. A. Congdoni and Andersoni 
are only minutely stipitate and softly silky all over and belong in 
the central Sierra region and with pods having a rather cordate cross 
section. A. sylvaticus is stipitate and with shining pods and 
whole plant about smooth, and abounds in the pine forests of the 
southern Cascades. A. albens has a peculiar depressed pod con- 
 Spicuously stipitate and like all its predecessors but the first 
. group jointed to calyx and has silvery pubescene closely appressed 
_ and belongs in the Death Valley region. The rest of the section 
