ELORA Of ADEN. 
n 
Hettotroplum sfcrigoeum. 
Heliotropium undulatuia. 
Lycium europifium. 
Cistanche lutea. 
Sotaria verticillata. 
Panicutn antidotale. 
Eragrostis major, 
Enneapogon brachy st acliyus. 
Other species are known to occur in 
Poly car paea corym bosa. 
Pagonia cretica. 
Crotalaria striata. 
Triantbema monogyna. 
Ipomoea biloba. 
Amarantus viridis. 
Amarantus polygamus. 
Euphorbia hypericifelia. 
various parts of both hemispheres :• — > 
Sotaria viridis. 
Panicum colonum. 
Eriochloa polystachya. 
Aristida adscensionis. 
Eragrostis ciliaris. 
Cynodon dactylis. 
Eleusine ffigyptiaca. 
A few species do not belong to any of the preceding groups, most of 
them occurring only east of Aden. We give their respective areas : 
Cleome quinquenervia, S. Arabia, S. Persia, Sind, Afghanistan. 
Maerua ovalifolia : Western India. 
Argyrolohium roseum : Persia, Baluchistan, Sind, N. W' India, up to 
7,000 feet. 
Acacia ebumea : Baluchistan, Afghanistan, India. 
Kissenia spathulata : S.'iW. Africa, Yemen, Hadramaut. 
Oldmlmdia strict® '. S. India, Ceylon. 
Salvador a aikoules': Sind, Rajputana, Punjab, Gujarat. 
Heliotropium opkioglossum : S. Arabia, Somaliland,- S. Persia, 
Baluchistan, Sind. 
Schweinfurthia pedicellata : Socotra, Sind.* 
Co metes sur aliens is : Muscat, S. Persia, Waziristan, Baluchistan, 
Sind. 
Halopyrum mucronatum : S. Arabia, N. India. 
Ephedra fo'liata : Syria, Turkestan, S. Persia^ Afghanistan', W. 
Punjab,, Sind. 
80 The Origin of the Flora of Men. 
It is evident from the above tables that, the greater part of the flo?’a 
of Aden is composed of species belonging to the Indo- African desert and 
the N. African steppe. The considerable number of species which are 
common to Aden and the countries bordering the Red Sea on the opposite 
side form a particularly striking feature. It was just this similarity 
of vegetation which induce 1 some scientists to assume on old continent 
as the centre of origin of this flora. 
That India and certain parts of Africa were united in mezozoic times 
into one great stretch of nearly continuous dry land is now proved by 
