INTRODUCTORY CHAPTER. 



lvii 



Table showing distribution of genera with endemic species in the 

 phanerogamic flora of Socotra — continued. 



Genera. 



Eureiandra, 





Dendrosicyos, 



Begonia, 



Tetragonia, 





Nirarathamnos, . 

 Carum, 

 Peucedanum, 

 Dirichletia, 



T. 



Placopoda, 

 Hedyotis, . 

 Mussosnda, 





Gaillonia, . 

 Valerian ella, 

 Vemonia, . 

 Psiadia, 



T." 



Pluchea, 

 Helichrysum, 





Puliearia, . 



t. 



Senecio, 





Euryops, . 





Dicoma, 



Laetuca, . . T. 

 Prenanthes, . T. 



Launsea, 

 Vogelia, 



Sideroxylon, 

 Euclea, 

 Jasminum, . 

 Socotora, 

 Eetadiopsis, 

 Mitolepis, . 

 Cochlanthus, 

 Secamone, . 



Vincetoxicum, 



Marsdenia, 



Boucerosia, 



Exacum, 



Cordia, 



Heliotropium, 



Triehodesma, 



Cystistemou, 



Ipomo3a, 

 Convolvulus, 



TRANS. ROY. SOC. EDIN. VOL. XXXI. 



Has only two species outside of Socotra — one in 



Angola, one in central Africa. 

 Unique on account of the arboreous habit. 



Attains a maximum in south Africa. Not known 



from the adjacent coasts of Asia. 

 Allied to the cosmopolitan genus Bupleurum. 

 Chiefly old world. 

 Chiefly northern hemisphere. 

 Only three species known outside of Socotra, from 



east tropical Africa and Madagascar. 

 Allied to Dirichletia. 



Extending to the islands of the Indian and Pacific 

 Oceans. 



Chiefly northern hemisphere. 

 Chiefly Brazilian. 



Chiefly tropical and subtropical Africa, Mada- 

 gascar, and Mascarene Islands. One species 



extends from tropical Africa to Arabia. 

 Chiefly American. 

 Chiefly south Africa, highlands of tropical Africa, 



Mascarene Islands, and Australasia. 

 Headquarters in the Mediterranean region. One 



species is south African. 

 The section Klcinia of the Socotran plant is chiefly 



south African. 

 Almost entirely south African. One species is 



found in Arabia, and the same one probably 



also in Nile-land, and one grows on Kilima 



Njaro. 

 Has headquarters in south Africa, with a few 



tropical African and one Indian species. 

 Chiefly old world, 

 Northern hemisphere, chiefly American. Though 



absent from Africa, found in Canary Islands, 



also Europe and northern India. 

 Extends from Canary Islands through Mediterranean 



region, and occurs in south Africa and in India 



(Peninsula). 

 Only three species. One is south African, one occurs 



in north-west India and Arabia, and reaches 



Socotra, forming an endemic variety ; the third 



is the endemic Socotran plant. 



Only south and tropical African. 



Chiefly old world. A few south American. 



Quite aberrant. 



A small east tropical and south African genus. 



Allied to south African and Madagascar genera. 



Allied to south African and Madagascar genera. 



Extends to Australia. The section of the genus 



represented in Socotra is Mascarene and 



Madagascar only. 

 Habit of Socotran species resembles that of west 



Indian forms. 



Northern hemisphere. 

 Chiefly in cooler regions. 

 Chiefly American. 



Extending to Australia. 

 Probably closely related 

 genus Borago. 



to the Mediterranean 



h 



