284 BOTANY OF SOCOTRA. 



A. capensis, Wedd. in Ann. Sc. Nat. se>. 4, i. (1854), 212. 



Didymodom debilis, E. Mey. in Sched. PL Dreg. ; Wedd. Monog. Urtic. 548, t. 20, f. B, and in 

 DC. Prod. xvi. 1, 235 59 . 



Socotra. On the hill slopes with species of Galium and Valerianella, 

 B.C.S. n. 487. 



Distpjb. South Africa. 



Another interesting relationship with the south African flora is established 

 by the discovery of this plant in Socotra. 



MONOCOTYLEDONES. 



Order LXXI. HYDROOHARIDE^. 



A small family of water plants. The fresh-water species are found widely 

 spread over warmer and temperate regions of both the old and new world ; the 

 marine forms are chiefly and almost entirely developed in the Indian Ocean and 

 adjacent seas — but some species are described from districts in the new world. 



LAGAROSIPHOK 



Zagarosiphon, Harv. in Hook. Journ. Bot. iv. 230, t. 22 ; Benth. et Hook. Gen. PI. iii. 450. 



A small genus of about five species of submerged fresh-water plants. 

 Tropical Africa, south Africa, Madagascar, and India are the areas of their 

 limited distribution. 



L. Roxburghii, Benth. in Benth. et Hook. Gen. PL iii. 451. 



Vallisneria alternifolia, Koxb. Plor. Ind. iii. 750; Wight in Hook. Bot. Misc. ii. 344, 



Suppl. t. 11. 

 Nechamandra Roxburghii, Planck, in Anu. Sc. Nat. sdr. 3. xi. (1849), 78. 



Socotra. In pools formed by the rivers. Boivin n. 1064. 



Distrib. India, Malay Peninsula, and some of the islands of the Eastern 

 Archipelago. 



This is a plant collected by Boivin but absent alike from Schweinfurth's and 

 from our collections. To Dr Schweinfurth I am indebted for the information 

 that a specimen from Socotra is in Berlin Herbarium. This I learn from 

 Professor Eichler is a duplicate from Paris Herbarium, and he has kindly 

 sent me a small fragment of it. Professor Ascherson identifies it as above, 

 and after examination of the small portion sent to me, I agree with him. lie 

 suggests it is introduced in Socotra. 



