64 
FLORA OF ADEN. 
A few are confined to S. Arabia and tbe northern coast of Somali- 
land : Cleome polytricha , Cleome brachystyla, Gypsophila montana , 
Crotalaria , leptocarpa (also in Socotra), Cassia adenensis , Steinheilia 
radians , Convolvulus sericophyllus % Barleria Hildebrandtii , Salsola Bottce 
Euphorbia systyla. 
The following occur only in Yemen and Hadramaut : Heliotr opium 
paradoxum , Saltia papposa, Euphorbia adenensis , Sterculia arabica (also 
in Socotra). 
Several have bean reported from Yemen alone : Acacia Edgeworthii , 
Corallocarpus glomeruliflorus , Ptychotis arabica , Adenium arabicum , 
Caralluma adenensis , Caralluma ForsJcalii ) Campylanthus junceus } Lavan- 
dula setifera , Littonia minor . 
We do not know the exact limits of Pulicaria glutinosa. Boissier 
gives South Arabia. 
3. The third group shows a wider distribution. Its members belong 
to the N. African Steppe-province, which comprises Kordofan, 'Darfur, 
Sennaar, Etbai, Abyssinia, Yemen, Hadramaut, and the island of 
Socotra. 
It is well to remember that Aden, geographically considered, belongs 
to this province. 
The subjoined table shows the species with their respective limits 
of distribution. They are 42 in number, thus forming almost £ of the 
total of Aden plants. Of these 26 have their eastern limit in Arabia, 
1 in Persia, and 15 reach as far as India. 
Species belonging to the JV. African Steppe-province . 
R'nftPi AS! 
Limit towards 
Notes. 
West. 
^East. 
1 
Cleome papillosa 
Kordofan 
N. W. India, 
Sind. 
Also in Socotra. 
2 
Cleome brachycarpa 
>» • 
Punjab . 
»» it 
3 
Cleome paradoxa . • 
a • • 
S. Arabia 
4 
Cadaba rotundifolia 
» 
» • • 
» »j 
5 
Cadaba glandulosa 
>> 
6 
Cadaba longifolia 
Sennaar . 
9> • • 
» a 
7 
Reseda amblyocarpa . 
Abyssinia 
9> • • 
