38b GEGUMINOSH. (PEA FAMILY.) 
Fig. A. Ataisseen asingle flower of Lupinus Dow 
guasii; b, the same with the upper and side petals re- 
moved, showing the united pair of long-clawed, lower 
petals and the base of the stamineal tube. 
Fig. B. u. The same flower with all the petals re- 
moved, showing the united stamens, 6 of which have 
shed the pollen and crinkled down. b. The stamens as 
they appear in abud. The shorter stamens of the bud 
become the longer stamens of the flower. c. Anther of 
a long stamen in @ magnified. d. Anther of a long 
stamen in b (short in a) magnified. 
order, the species within the United States numbering about 150, nearly all of which 
‘elong west of the Rocky Mountains. We have about 25 kinds of clover; only 3 or 4 
species are natives of the East. Hosackia, numbering 28 species in our whole country, 
25 of which grow here, is not represented in the East at all. On the other hand, the 
large genus Desmodium, numbering in the East 19 species, has no representative west of 
the Rocky Mountains. Pickeringia is probably not found beyond the boundary of Cali- 
fornia. The great Australian genus Acacia, numbering there nearly 300 species, is 
represented in Southern California by a small tree (A. Greggii), and in the East by an 
herb. Possibly 30 species are cultivated for shade trees, Honey Mesquit, or Algaroba 
(Prosopis juliflora) and Screw-pod Mesquit, or Tornilla (P. pubescens), are small trees of 
Southern California. Prosopis and Acacia belong to the Suborder Mimosezx. All the 
plants here described (except Cercis) belong to the Suborder Papilionacez, which is dis- 
tinguished by flowers, like those of the pea, as before described. 
Cercis, which, by mistake, is not described in the proper place, belongs to the Sub- 
order Cxsalpinesw, in which the side petals enclose the upper one and the stamens are free, 
 § 1. Stamens distinct. 
Leaves digitately 3-foliolate. Herbs; yellow flowers..............-+- Thermopsis. 1 
Shrub; purple Mowers. ci lenete saw a aehee ode jem RBeweaseakeReasemses Pickeringia. 2 
Leaves unequally pinnate; shrubby; 1 petal...... danersaree disiaeoinie misteteaee Amorpha 9 
§ 2. Stamens all united into a sheath. 
Anthers of two forms; leaves digitate, more than three leaflets...........Lupinus. 3 
Anthers all alike; leaves pinnately 3-foliolate..... Sse esaInetaiela wisteratatesare Psoralea. 8 
§ 3. Stamens diadelphous (2 sets, 9 and 1). 
* Leaves 3-foliolate; pods small. 
Flowers capitate. Corolla persistent... .. ue tmoreericec ESET vie oie: Trifolium. 4 
Flowers in axillary racemes or spikes. Pod globular, wrinkled..........Melilotus. 5 
Flowers in axillary spikes. Pod one-seeded...............seeeeeeee.---FSOralea. 8 
Pod spirally coiled or reniform........ wees coeces senorccerere cess -ededicago. 6 
