BP Singh

Priorities for Promising Plant Introductions 107Contd ..... (Table 1).Centre of origin7. Mediterranean centre8. African centrePlant speciesSilybum marianum, Lavandula officinalis(1. angustifolia) many cultivated varietiesare hybrids with wild relatives and 1.latifloia, Majorana hortensis, Melissaoffinali'l, Mentha aquatica, M. longifolia,M. puleqium (Eruopeto Iran), Rosmarinusofficina lis, Salvia officinale cultivated inmany gardens in temperate and tropicalcountries. S. sclarea Iran andTranscaucasia, Satureja hortensis CentralEurope and Siberia, Aloe barbadensisSpread to other regions i.e. Saudi Arabia,EastAfrica,N.W. India, S. Chian andcultivated in W. Indies, Urginea maritima,Algeria, Digitalis purpurea, Hyoscyamusniger, Papaver somniferumCommiphora ssp., Pelargonium graveolenscultivated in Algeria and Reunion Island,P. odoratiimum9. European-Siberian centre Cannabis sativa the wild form (c. ruderatis)is found in CentralAsia (centre-6);Humulus lupulus especially cultivated inEurope and N. America, Anthmis nobilis,Artemisia absinthium, A. maritima Europeto Mongolia, Carum carvi cultivated inNorth India and Sudan, Mentha'cordiaca,M. arvensis, M. longifolia, M. spicatea, M.viridis, Origanum vulgare, Glycyrrhizaglabra, Aconitum vulgare, Aconitum.napellus, Digitalis Zanata, D. pUrpurea,Levisticum officinale & Valeriana officinalis10. South American centre Cinchona ledgeriana and C. officinal is,Andes mountains of S. Peru, Bolvia and,S. Ecuador. There are many Cinchonaspecies found and great diverSity ofbotanical varieties is caused by naturalhybridization between the species andvarieties.