FLORA OF ADEN. 
163 
(keel). Stamens 10, diadelphous, monadelphous or free. Ovary free; 
embryo usually with an indexed radicle. Cotyledons accumbent. 
Distribution .--—All over the world. 
Tribe 1. Genistea : — Stamens 10, monadelphous or diadelphous. 
Anthers usually of 2 kinds. Pod 2-valved, not articulated. Leaves simple 
or digitately trifoliate — 
Tube of stamens slit along the top . . . . .1. Frotalaria. 
Tube of stamens not slit along the top . . . .2. Argyrolobium. 
Tribe 2. Trifoliea : — Stamens diadelphous ; filaments usually dilated 
at the apex. Pod usually dehiscent, not jointed. 
Leaves pinnately 3-foliate . ...... 3. Medicago. 
TribeS. Galegece : — Stamens monadelphous or diadelphous ; anthers 
usually uniform. Pods usually 2-valved, not articulated. Leaves impari- 
pinnate, rarely simple entire — 
a. Anthers apiculate. Hairs fixed by the centre . . ,4. Indigofera. 
b. Anthers obtuse. Hairs basifixed. 
# Flowers mostly in leaf opposed racemes . . .5. Tephrosia. 
# *Flowers mostly in axillary racemes . . . .6. Sesbania. 
Tribe 4. Hedysarecer — Stamens monadelphous or diadelphous , anthers 
dimorphous or uniform. Pods usually articulated. Leaves imparipinnate, 
rarely abruptly pinnate. 
Not spinescent . 4 . . , . .7. Taverniera. 
Spinescent ...... ... 8. Alhagi. 
Tribe 5. Phaseolece : — Stamens diadelphous or monadelphous. Anthers 
usually uniform. Pod 2-valved, not articulated. Scandent, rarely erect 
herbs. 
Leaves pinnately 3-foliate . . . . . .9. Rhynchosia. 
1, Crotalaria Linn. 
Herbs or shrubs with simple or digitately trifoliate leaves. Flowers 
in racemes, terminal or leaf-opposed or rarely in the axils of the leaves. 
Calyx-tube short, of 5 distinct equal or subequal teeth. Petals subequnl ; 
standard orbicular or ovate with a short claw ; keel rostrate, upcurved. 
Stamens monadelphous (diadelphous in C. Schioeinfurthii Defl.) ; anthers 
dimorphous. Ovary sessile or stalked, bi-or many-ovulate ; style abruptly 
bent upwards near the base, bearded along the inner side. 
Pod straight, linear-oblong, turgid or inflated (not inflated in C 
lejotocaiya Balf.), continuous within. 
Species over 350. 
