: [Vol. 8 
122 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
10. The montana group, consisting of L. lata, L. rectipes, L. 
montana, and L. curvipes, is, in its most primitive representative, 
very close to L. pinetorum of the preceding group. The only 
character distinguishing all the species of this group from all of 
the preceding is the pubescent pods. L. lata, like L. pinetorum, 
shows only a partial inhibition of the terminal bud. In all the 
other species this inhibition is complete. L. rectipes and L. 
montana may both have developed from L. lata. L. curvipes is 
certainly an offshoot of L. montana. The transition from glo- 
bose to elongated pods with a compressed apex is seen in this 
group. 
11. L. globosa is another solitary species derived perhaps from 
some very ancient form. 
12. The affinity of L. mendocina remains obscure. Although 
it has reached a stage of development equivalent to L. montana, 
there is no evidence that they are closely related. 
13. The alpina group is a homogeneous assemblage of closely 
related forms characterized by narrow leaves. In the two most 
primitive of these, L. intermedia and L. arizonica, the inhibition 
of the terminal bud varies greatly within the species. L. alpina 
has probably been developed from L. intermedia and it in turn 
has given rise to L. condensata. In both these species the inhi- 
bition of the terminal bud is complete. The gradual reduction 
in the number of ovules in the species of this group has been 
mentioned elsewhere. The appearance of a terminal compression 
of the pods in L. alpina is passed on to L. condensata. The 
origin of L. Garrettii is in doubt. Possibly it is an offshoot from 
L. intermedia. L. valida has not been seen but seems to be a 
primitive member of this group. "— it is but a form of 
L. intermedia. 
14. The utahensis group, consisting of L. cinerea, L. Kingii, 
L. latifolia, L. Wardii, L. utahensis and L. prostrata, is taxo- 
nomically the most perplexing group of all. This is due in part 
to lack of adequate material and in part to a variability of the 
species concerned. There are within the group no evident 
lines of development. Rather this seems to represent a plexus 
of evolution, where the units, be they considered species, races, 
forms, or varieties of a great polymorphic species, are in a state 
of change. The group as a whole is characterized by the dense 
