INTRODUCTORY CHAPTER. 



It 



List of endemic species in the phanerogamic flora of Socotra— continued. 



EuPHORBiACE.fi — continued. 

 Euphorbia spiralis, Balf. fil. 

 180 Phyllanthus filipes, Balf. fil. 



Securinega Schweinfurthii, Balf. fil., 

 Jatropha unicostata, Balf. fil. 

 Croton sarocarpus, Balf. fil. 

 , , sulcifructus, Balf. fil., . 



, , elseagnoides, Balf. fil., . 

 ,, socotranus, Balf. fil. 

 Cephalocroton socotranus, Balf. fil., 



Tragia dioica, Balf. fil., . 



URTICACEfi. 



Dorstenia gigas, Schweinf. , . . . 

 190 Ficus socotranus, Balf. fil., 



ORCHIDEfi. 



Habenaria socotrana, Balf. fil., 



iRIDEfi. 



Babiana socotrana, Hook, fil., . 



Aryllidaceje. 

 Crinum Balfourii, Baker, .... 

 Haemanthus grandifolius, Balf. fil. 



DlOSCOREACEfi. 



Dioscorea lanata, Balf. fil. 



LlLIACEiB. 



Aloe Perryi, Baker. 

 ,, squarrosa, Baker, .... 



Dracaena Cinnabari, Balf. fil., . 



Anthericum graptophyllum, Baker, 



200 Dipcadi Balfourii, Baker, 



Urginea porphyrostachys, Baker, 



GRAMINEfi. 



Eriochloa vestita, Balf. fil., . 

 Panicum rigidum, Balf. fil. 



Rhynchelytrum microstachyum, Balf. fil., 



Lepturus tenuis, Balf. fil., 

 206 Ischnurus pulchellus, Balf. fil., 



Kemarks, Affinities, &c. 



Allied to south European S. buxifolia, Mull. Arg. 



Allied to C. zambesicus, Mii.ll. Arg. from east tropical Africa. 

 / Has affinity with the south African C. gratissimus, Burch. and tli» 

 I west African C. amdbilis, Miill. Arg. 



f Modifies the generic character. Only two other species known, 

 I both tropical African. 



f Allied to the widely spread species T. involucrala, Jacq. and to tlm 

 I tropical African and Arabian T. mitts, Hochst. 



Perhaps allied to D. radiata, Lamk., an Arabian plant. 

 Near F. platyphylla, Caill., a Nubian species. 



/ Nearly related to H. attenuata, Hook, fil., a plant of the Cameroon 

 I Mountains. 



Nearest to B. plicata, G., a south African species. 



i Nearest alliance with two Himalayan species C. amainum, Roxb. 

 \ and C. longifolium, Roxb. 



Allied to the south African A. consobrina, Salm-Dyck. 

 Allied to D. Draco, Linn, from Canary Islands, to D. Ombet, 

 Kotsch. and Peyr. from Nubia, and to D. schizantha, Baker from 

 Somali-land, 

 f Allied to A. nubicum, Baker, a Nubian plant, and A. inconspicuum , 

 I Baker from Somali-land. 

 Allied to the Mediterranean D. serotinum, Medic. 

 U. anther icoides, Steinh. , an Algerian plant, is its nearest alliance. 



Probably allied to the Indian E. punctata, Hamilt. 



( Annual. The Nubian R. grandiflorum, Hochst. and another species 

 \ from Abyssinia are the only other ones in the genus. The 

 ( Socotran species has a distinct variety. 



{Annual. L. filiformis, Linn., a Mediterranean species, is an ally, 

 and also the Australian and south Pacific L. repens, R. Br. 

 Allied to the monotypic Indian Oropetima. 



Of the 136 genera to which the endemic species belong, the large number 

 of 98 are represented by endemic species only ; and of the 20 endemic 

 genera 18 are monotypic, — the exceptions being Ballochia, which is tritypic, and 



