242 BOTANY OF SOCOTRA. 



an extensive distribution, but apparently does not run into Europe. With 

 the last set it is represented both in the Canary Islands and in Socotra. 



It may be possible within these groups to recognise local varieties, but I 

 shall not enter upon that question here. 



The plant has a tendency to form galls from the attacks of some Cecidomyia. 

 n. 613 shows this. 



6. LEUCAS. 



Leucas, E. Br. Prod. 504 ; Bentb. et Hook. Gen. PL ii. 1213. 



A large genus of usually woolly plants of the Asiatic and African tropics, 

 and introduced in America. Of the four Socotran species, one is endemic, 

 belonging to a section of the genus that is essentially Asiatic or Australian, one 

 is a native of north-east Africa alone, and one of the Indian Peninsula alone, 

 and the fourth is common to north-east Africa and south west Asia. 



1. L. (Hcmistoma) urticsefolia, R. Br. Prod. 504; Benth. in DC. Prod, 

 xii. 524 ; Ach. Kich. Tent. Flor. Abyss, ii. 199 ; Boiss. Elor. Orient, iv. 778 ; 

 Wight Ic. t. 1451. 



L. affinis, B. Br. in Salt. Abyss, app. 



Ballota arabica, Hochst. et Steud. in herb. Schimp. Arab. n. 818. 



Socotra. Common near Galonsir, Tamarida, and elsewhere. B.C.S. n. 

 726. Schweinf. n. 390. 



Distpjb. South-west Asia and north-east Africa. 



2. L. (Loxostoma) Neuflizeana, Courb. in Ann. Sc. Nat, ser. 4, xviii. 

 (1863), 145. 



L. fancier enata, Vatke in Linnsea xliii. (1880), 98. 



Socotra. At Tamarida. Schweinf. nn. 337, 733 in lit. 



Distiub. Abyssinia, Dessi island, cast tropical Africa. 



A little-known species described by Courbon in his account of the flora of the 

 island Dessi in the Red Sea. Ehrenberg had many years previously collected 

 specimens of the same plant in Abyssinia. Hildebrandt's specimen from 

 "N-Dara (Taita)," described as L. paucicrenata, by Vatke, is a more villous 

 form than the Abyssinian plant, but is undoubtedly the same sjDecies. 



3. L. (Ortholeucas) lanata, Benth. in Wall. PL As. Rar. i. 61, and in DC. 

 Prod. xii. 525. 



L. collina, Dalz. in Hook. Kew Journ. ii. (1850), 338. 



