24 



25. Bisulcati. This group forms a slight modification of the 

 Ccreati hardly -worth separating from it. The species are taJl, 

 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 sulcato 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 p^d with reni- 

 form cross-section, and not at all inflated. This frequents mountain 

 valleys from Colorado to Utah and Montana. A. Osterhouti is an 

 aberrant form harking back toward the Homalobi. It belongs on the 

 Nava.io 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 i-mceus 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 l^ere, but the tendency 

 toward an impressed dorsal suture would place it here. 



28. Hamosi. This group gees 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 Coahuilae. 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 Mississ'npi, 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 MogoUons. 

 The rest of the Hamosi is without the pick-shaped hairs, and pods 

 not coriaceous, with mostly Y-shapcd cross»3ection, but 2-celled, 

 mostly linear. A. Bernardinus and Orcuttianus wath 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 Andersonl 

 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 



