Minor and trace elements of biological interest in some warm climate plants cultivated at Aswan (Egypt) were analysed to demonstrate their element metabolism, animal nutrition, toxicological effect and their uses as therapeutic plants. The seven plants studied wereMacroptilium atropurpureum,Pennisetum glaucum,Cyamopsis tetragonolobus,Dolichos purpureus,Cajanus cajan8 (Variety 78/237 A-Brasil),Cajanus cajan13 (Variety 79/450 Uganda) andProsopis juliflora. Silver, gold, cadmium, cobalt, copper, iron, potassium, manganese, magnesium, sodium, nickel, lead, strontium and zinc were analysed by Atomic Absorption Spectrophotometer, while iodine, fluoride and chloride content were analyzed using Ion Selective Electrode. The results of analysis reveal thatProsopis julifloraexhibits the highest element concentration, which illustrates the high ability of this plant to concentrate these elements and also its highly nutritional value for animals, while all these plants can be used as therapeutic plants. All elements in the studied plants were in the safety baseline level for animals which reflect their nutritional and beneficial values. The present study gives a new picture about ion antagonism in these plants and their uses not only as a food for animals but also as therapeutic plants to compensate of element deficiency. Ion Selective Electrodes were used successfully and accurately for I, F and Cl measurements both by direct and known addition methods and in a low concentration measurement of these ions.