INTRODUCTORY CHAPTER. 



lxiii 



List of species of the phanerogamic flora of Socotra with general old- 

 world distribution; some introduced in Socotra. 



Ionidium suffruticosum. The only 

 species of the genus in tropical Africa. 

 Portulacca quadrifida. Animal. 

 Talinuni crmeilblium. Reaches Europe. 

 Tamarix gallica. 

 Abutilon fruticosum. 



,, muticum. 

 Hibiscus vitifolius. Annual. 

 Corchorus acutangulus. 

 Zizyphus Jujuba. 



,, Spin a-Christi. 

 Vitis quadrangularis. 

 Medicago denticulata. Annual. Only 



in the northern hemisphere. 

 Indigofera cordifolia. Annual. 



, , paucifolia. 



,, viseosa. Annual. 



Alysicarpus vaginalis. Annual. 

 Cassia Absus. 



Ammania baccifera. Annual. 

 Momordica balsamina. Annual. 

 Citrullus Colocynthis. 

 Melothria punctata. 



Oldenlandia Heynei. 

 Galium Aparine. 

 Vernonia cinerea. Annual. 

 Dichrocephala chrysanthemifolia. 



Annual. 

 Heliotropium ovalifolium. Annual. 



,, strigosum. 



Ipomoea obscura. Annual. 

 Solanum indicum. 

 Physalis minima. Annual. 

 Wrthania somnifera. 

 Striga hirsuta. Annual. 

 Asystasia coromandeliana. 

 Boerhaavia repens. 

 Digera arvensis. 

 Amarantus Blitum. Annual. 



,, polygamus. Annual. 



Pupalia lappacea. 

 Aerua javanica. 



,, lanata. With an endemic 

 variety. 

 Polygonum barbatum. 

 Phyllanthus maderaspatensis. 



Acalypha indica. Annual. 



Commelina benghalenis. 



Juncus maritimus. Northern hemi- 

 sphere only. 



Naias graniinea. Annual. 



Cyperus pumilus, var. patens. Annual. 

 The Socotran form is tropical 

 African and Australian. 



Cyperus umbellatus, var. cyperinus. 



Kyllinga monocephala. 



Fuirena glomerata. Annual. 



Paspalnm serobiculatum. 



Panicum eruciforme. Annual. 

 , , Petiveri. Annual. 



Arthraxon molle. 



Andropogon hirtus. 

 , , pertusus. 



Chrysopogon Gryllus. 



Anthistiria ciliata. 



Apluda aristata. 



Aristida adscensionis. 



Eleusine verticillata. Annual. 



Eragrostis plumosa. Annual. 



The geographical areas of the remaining plants are more definite. One hun- 

 dred and nine of them may be considered as inhabitants of the regions in Africa 

 and Asia adjacent to Socotra, that is to say, occupying the north-east corner of 

 Africa, including Nubia, Abyssinia, and Somali-land, and the south-west corner 

 of Asia. Taking this region as a centre, they extend in a varying degree east- 

 wards and westwards ; eastwards passing through Persia and Beloochistan to 

 Affghanistan and even Turkestan on the north ; to Scindh, the Himalayas, 

 and the Indian Peninsula, and even Ceylon on the south ; westwards spreading 

 through Syria and Egypt into the Mediterranean region and reaching south- 

 west Europe and the Atlantic Islands, or passing more directly across tropical 

 Africa to the Atlantic Islands — with not infrequently extensions to south 

 Africa, to Madagascar, and to the Mascarene Islands. Some of these species 

 have an exceedingly limited geographical area, in the case of others the range 

 is very extensive. Some of the plants are perhaps introductions. The following 

 is a list of the species having this distribution : — 



List of one hundred and nine species of the phanerogamic flora of 

 Socotra with distribution in north-east Africa and south-west Asia. 



Species. 



Western limit. 



Eastern limit. 



Intermediate and farther 

 extension, Remarks. 



Cocculus Leseba, 



De Verde Islands 



India 



Tropical Africa. 



Farsctia longisiliqua, 



Nubia 



Arabia 





Sisymbrium erysimoides, 



Canary Islands 



South Persia 



Mediterranean region and Abys- 

 sinia. Annual. 



Cleome papillosa, . 



Nile-land 



North-west India 



Annual. 



,, brachycarpa, 



Nile-land 



North-west India 





Cadaba longifolia, . 



Abyssinia 



Arabia 





Capparis aphylla, . 



Nile-land 



North-west India 





Oehradenus baccatus, 



Nile-land 



Scindh 





Polygala abyssinica, 



Tropical Africa 



North-west India 



Also south Africa. Annual. 



,, erioptera, . 



De Verde Islands 



North India 



Tropical Africa. Annual. 



