In the present work ten species of the family Solanaceae were studied applyingtechniques of pharmacognosy and histochemistry for the differentiation and identificationof each of the species. The anatomical characteristics used in the differentiationof the species are the types of trichomes, stomatas, crystals, glands, andposition of pallisade parenchyma. In the histochemical tests the species presentdifferent grades of reaction in the contents of proteins, tannin, and alkaloids.