23 
hills, A. Zionis and remulcus of the Grand Canon region, and the 
small A. tephrodes of central New Mexico plains, and slopes. AU 
these are either of the Lower Temperate life zone or reach a little 
up into the Middle. We now have a peculiar group of the Navajo 
Basin with cellular pods, A. pygmaeus and Musiniensis, in the Lower 
Temperate life zone. Then we have a group with pick-shaped hairs. 
A. cymboides and Missouriensis have rather small pods, the one 
belongs in the clay lands of the Navajo Basin, the other on the 
Plains from Montana to New Mexico. A. amphioxys is the third mem- 
ber of this group and has variously elongated and arched pods and 
belongs on the Colorado drainage and adjacent parts of the Rio 
Grande. The Group with woolly pubescence shows a tendency to 
inflation of pod but never very great. Of this A. Newberryi and Eu- 
rekensis have hairy pods and belong in the Great Basin region though 
the first extends to the Mogollons and both in the Lower Temperate. 
Forms with woolly leaves and pods are A. coccineus and funereus of 
the Death Valley region, A. Utahensis of the Great Basin in general 
and A. inflexus of the Columbia Basin. A species with very shortly 
woolly pods and hairy leaves is A. Purshii of both Basins, 
20. Succumbentes. This group with so many characters of the 
Hamosi as to the pods still is related to the Malaci on the one hand 
and the Galegiformes on the other. The flowers are those of the 
latter and the leaves and habit and even the pods more like the Ma- 
laci. But at best the relationship is remote, even to any known 
species. For the present I merge this in the Malaci. 
21. Malaci. This group separates from the Argophylli early at 
A. eibarius. A. Parryi and Feensis with capitate flowers come first 
and belong to the Colorado foothills and New Mexical plains re- 
spectively. A. ensiformis, malacus and Layneae follow. The first 
species belongs on the high plateau south of St. George Utah; ^A. 
malacus along the eastern base of the Sierras and over to the 
Snake river on the Columbia drainage; A. Layneae from the south- 
ern Sierras to the Grand Canon. The whole group belongs in the 
Lower Temperate life zone, in and near the pinon and juniper mesas. 
22. Mollissimi. This group, the highest differentiation of the 
Argophylli is compact and mostly Mexican. Species with smooth 
pods are A. mollissimus and giganteus of the Colorado and Texan 
to Arizona plains and mesas. Forms with stiff-hairy or shaggy pods 
are A. Bigelovii and Phoenicis of the New Mexican and Mogollon 
mesas, and a variety extending to central Utah. The form with 
felted pods is A. Humboldtii of the high valleys of Mexico. Forms 
with inflated pots are A. Orizabae of central Mexico, A. orthanthus 
of Coahuila, and A. anisus of Pueblo Colorado. Apparently all the 
species belong to the Lower Temperate life zone in well drained regions 
with little alkali. 
23. Sarcocarpi, This branch of the Malaci starts off early also, 
apparently near A. Parryi, whose closest relatives are A. Tennesse- 
ensis and Plattensis; the one from the southern prairies from Iowa 
to Tennessee, the other from Indiana to Colorado and Texas on plains 
and prairies. The species with plum-shaped and very fleshy pods are 
A. crassicarpus and Mexicanus of the Plains and prairies from Mon- 
- tana eastward and southeastward to Texas. 
24. The natural alteration of the Flexuosi is the Ocreati into 
which it passes at the start by the modification of the walls of the 
pods in grooves and ribs. but without intrusion of the suture notice- 
ably. This group, like the Bisulcati has the flowers mostly with a 
strong and snake-like odor and inhabits the Navajo Basin region. 
The species with pick-shaped hairs are A. sophoroides and conferti- 
florus, the latter growing also in the Green River Basin of Wyo- 
ming. The species with normal hairs are A. argillosus of the Green 
River region in Utah, and A: Moencoppensis of the Little Colorado 
region, the former growing on the hot bare mesas, and the latter in 
the pine forests of the Mogollons. ; 
