156 BOTANY OF SOCOTRA. 



309), which is a very different plant, with smaller flowers, fruits, and leaves. 

 So close is the resemblance between our species and the Mascarene and 

 Seychelles one, that, at first, one might almost regard them as conspecific ; but they 

 may be diagnosed by the following features : — The leaves in our plant are never 

 narrowed to the apex as in the Mauritian one, they never have a cordate base 

 (it is always more or less wedge-shaped), the flowers are on longer pedicels 

 and the whole cyme is more substantial, the calyx is thoroughly and always 

 truncate, and the fruit is much larger. From J. auriculatum the separation is 

 still wider, and the difference in size of the flowers and leaves is readily 

 recognisable. 



Order XLIV. SALVADORACE^E. 



A small family of three genera of trees or shrubs of tropical and subtropical 

 regions, inhabiting western Asia, Africa, and the islands of the Indian Ocean. 



SALVADOEA. 



Salvadora, Linn. Gen. n. 163 ; Benth. et Hook. Gen. PI. ii. 681. 



A genus of three species with the distribution of the order. 



S. persica, Linn. Sp. 178 ; Lamk. Illustr. i. 323, t. 81 ; Alph. DC. Prod, 

 xvii. 28 ; Boiss. Flor. Orient, iv. 43 ; Clarke in Hook. Flor. Brit. Ind. iii. 619 ; 

 Roxb. Corom. PI. i. 26, t. 26. 



Socotra. Near Tamarida. B.C.S. n. 334. 

 Distrib. From Syria and tropical Africa to India. 



Abundant on the island. The inhabitants use the twigs as tooth-sticks. 

 Camels feed largely on this plant, hence the specimens are usually dwarfed. 



Order XLV. APOCYNACE.E. 



A large tropical and subtropical order of both hemispheres. Its Socotran 

 development is interesting. Three genera are represented, each by one species. 

 One of these is endemic, with quite an exceptional habit in the order, one is a 

 tropical and south African and Arabian genus, and the third has a wider range 

 in Africa, tropical Asia, and Australia. 



1. CARISSA. 

 Cwrism, Linn. Mant. n. 1251 ; Benth. et Hook. Gen. PI. ii. 695. 



A small genus of shrubby, usually spiny plants, inhabiting Africa, tropical 

 Asia, and tropical Australia. 



