FLORA OF ADEN. 
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Calyx-tube campanulate ; teeth 5, subequal. Corolla free from the 
starainal tube ; standard obovate or oblong, contracted at the base, sub- 
sessile ; wings oblong ; keel shorter than the wings, obtuse. Stamens 
diadelphous ; filaments not dilated at the apex ; anthers uniform. 
Ovary sessile, usually many-ovulate ; style subulate, glabrous ; stigma 
oblique. Pod spirally twisted (rarely falcate), reticulately veined, 
scarcely dehiscent. 
Species about 40. 
Distribution : — Europe, W. Asia, N. Africa. 
The following species is cultivated at Shaikh Othman : 
1. Medicago sativa Linn. 
English name : — Lucern. 
Perhaps only a variety of Medicago falcata Linn, produced by culti- 
vation. The flowers are almost always violet, purple, or blue, and the 
pod is spirally twisted so as to form 2, or sometimes 3, complete rings 
or coils. 
4, Indigofera Linn. 
Herbs, shrubs or undershrubs of very various habit, more or less 
clothed with appressed silky hairs. Leaves imparipinnate or simple ; 
stipules usually small, setaceous. 
Flowers in axillary racemes or spikes. Calyx minute; teeth sub- 
equal or the lowest longest. Corolla usually rosy or purple ; standard 
ovate or orbicular, sessile or clawed ; wings oblong, adhering a little 
to the keel ; keel obtuse or acuminate, gibbous or spurred on both sides. 
Stamens diadelphous ; anthers uniform, apiculate. Ovary sessile or 
nearly so, usually many-ovulate ; style glabrous ; stigma capitate, often 
penicillate. 
Pod linear or oblong, rarely globose, septate between the seeds. 
Species about 300. 
Distribution : — Warmer regions of both hemispheres, abundant 
Southern and Tropical Africa. 
Flowers in lax, 6-12-flowered racemes . 
Flowers in many -flowered racemes — 
Leaflets 3 . 
Leaflets 3-5 — 
Pod 6-8-seeded 
Pod 2-4-seeded 
Pod 4-5-seeded 
Leaflets usually 3-7 
Flow ers in dense sessile heads of 12-20 flowers 
2. I. parvula. 
6 I. leptocarpa. 
1. I. paucifolia. 
3. I. semitrijuga. 
4. I. arabica, 
5. 1. argentea. 
7 I. trigonelloide& 
