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at the base becoming angular and slightly hairy above. The 
leaves are alternate and pinnate with two pairs of nearly sessile 
leaflets, the inferior pair of which are nearly elliptical and the 
superior pair are cuneate and noticeably larger. The leaflets are 
furnished with pulvini which comprise the entire stalklet ( about 
I mm. in length) The primary petiole is also furnished with a 
pulvinus and with two adnate stipules which partly clasp the stem. 
The straight tap root gives off numerous lateral roots. 
Nearly all of the roots examined bore quantities of the small 
tuber-like swellings which are a much discussed characteristic of 
the roots of the Leguminosae. These occur indifferently on the 
main and lateral roots. 
The flowers develop in the axils of the leaves. They are 
sessile, but with a long calyx, which may easily be mistaken for a 
peduncle. This calyx varies from 3 to 14 mm. in length, is cylind- 
rical, two-lipped, hairy and with two bracts at its base. The upper 
lip is two-toothed. The corolla is papilionaceous and yellow. The 
stamens are monadelphous and inserted in the calyx. They are 
ten in number and of two kinds, one with long two-celled anthers 
dehiscing laterally, and one with nearly spherical one-celled anthers. 
€ ovary is superior, small, conical and one-celled. The 
style is inserted a little to one side of the apex of the ovary. It is 
long, cylindrical, exceedingly slender, hairy for a short distance 
along one side from the stigma, and is terminated by a flat stig- 
maticsurface. After fertilization the gynophore begins its growth. 
The flower parts fall off; sometimes the style may be seen as a 
brown hair-like appendage to the ovary after the flower falls. 
More frequently it is thrown off with the flower. The ovary 
becomes tipped with a hardened and brown point. The gynophore 
curves so that it points towards the earth. The growth of the 
Synophore continues until the ovary has penetrated the earth for 
Some distance. The ovary then begins to swell to form the 
Pod. The part of the gynophore under ground thickens and 
develops hairs from its epidermal cells which are in every way 
similar to root hairs. 
The fruit develops only under ground. It is a one-celled pod 
bearing from one to three, or according to Kurtz, sometimes as 
Many as seven seeds. The numberis usually two. The pod is inde- 
