FLORA OF ADEN. 
171 
Locality. — Aden (Birdw,). 
Distribution : — Abyssinia, Nubia. 
3. Indigofera semitrijuga Forsk. FI. Aeg.-Arab. p. 137 ; DC. 
Prodr. II, 230 ; Boiss. FI. Or. Suppl. p. 172; Hook. FI. Brit. Ind. II, 
98 ; Oliv. Fi. trop. Afr. II, 93. 
Indigofera Burmannii Boiss. FI. Or. II, 189 et Suppl. p. 172. 
Indigofera somalensis Vatke Oesterr. Bot. Zeitschr. XXVI, 201. 
Description : — Stem fruticose, 1 foot or more, diffusely branched from 
the base ; the branches erecto-patent, firm, terete, glaucous-silvery. 
Stipules setaceous. Petioles \ inch long. Leaves \ inch long and more, 
usually with 3 pairs of close sessile obovate leaflets ; leaflets 1|— 2 lines 
long, the terminal one stalked, base cuneate, apex rounded, mucronate,. 
texture firm, both sides silvery. 
Racemes short- stalked, lax, of 6-12 flowers. Calyx silky, 1 line deep, 
lower teeth linear, reaching halfway down, the other shorter. Corolla 
more than twice the calyx, silvery on the outside. 
Pods spreading, linear-mucronate, § inch long, finely silky, 2-4- 
seeded. 
Fruits : — December (Schweinf.) ; August 1898 (Birdw,). 
On the south coast of Arabia it flowers in April and fruits in March. 
Locality : — Wadi Maala (Schweinf.) ; Goldmore Valley, promontory 
of Marshag, Little Aden in the plain between Jebel Ihsan and Jebel 
Muzulghum (Defl.) ; without locality (Birdw.). 
Distribution : — Upper Egypt, Nubia, Abyssinia, Kordofan, Sen- 
naar, highlands of Somaliland, Eritrea, S. Arabia, Sind. 
4. Indigofera arabica Jaub. et Spach 111. PL Or. V, 89, tab. 479 ; 
Anders. Journ. Linn. Soc. V, Suppl. p. 15. 
Description : — Stem more or less woody below, diffusely branched 
from the base ; young branches angular, silky. Stipules setaceous. 
Petioles very short. Leaflets 3-5, obovate or oblanceolate, |-| inch long, 
2-3 lines broad, lateral ones sessile and close, all often folded with a 
decurved point, both sides silvery. 
Racemes short, close, of 6-10 flowers. Flowers nearly sessile in the 
axils of the leaves. Calyx campanulate, silvery, teeth subequal, seta- 
ceous. Corolla scarlet, nearly twice the calyx, externally silverv. 
Pod ^-§ inch long, 1 line broad, linear-oblong, mucronate, slightly 
silvery, 4-5- seeded. 
Fruits: Dec. 1847 (Hook.). 
Locality : — On rocks (Hook.) ; without locality (Birdw.). 
Distribution : — Yemen, Hadramaut, White Nile. 
