Characterization of some Pelargonium spp. in Egypt. El-Ghadban, E. A. E. * and R. M. Rizk** * Medicinal and Aromatic Plants Research Department, Horticulture Research Institute and National Gene Bank, Agricultural Research Center, Giza, Egypt. ** National Gene Bank (NGB), Agricultural Research Center, Giza, Egypt. o GENERATE essential information of the identification, description and documentation of Pelargonium, P. graveolens L’Herit. Ex Ait cv. Baladi, P. graveolens cv. Kanater-8, P. graveolens cv.Gazaari (Algerian), P. fragrans Wild. and P. radula (Cav.) L.Her. were subjected to characterize and document using macro-morphological, micro- morphological data and chemical analysis of oil. A total of 47 attributes were selected, which are representing macro-morphology (26), hairs (9), stomata and epidermal cell (2) and oil percentage (10). Micro- morphologically, P. fragrans can be distinguished by presence of hair type 4 and mixed type of leaf stomata. The highest essential oil percentage (0.540%) was recorded in the first cut of Pelargonium radula, while the lowest percentage (0.110%) was recorded in second cut of P. graveolens cv.Gazaari (Algerian). GLC analysis of geranium essential oils revealed that a total of seven essential oil components were be determined viz.: Lemonene, linalool, citronellyl formate, citronellol, geraniol, geranyl butyrate and geranyl tiglate. The essential oil of Pelargonium fragrans was characterized by presence of limonene and absence of citronellyl formate and geraniol. Key words: Characterization, Geranium oil, Pelargonium Geranium (genus: Pelargonium) belongs to family Geraniaceae. Pelargonium comprises of about 280 species. The term geranium is frequently used as the common name of certain species of Pelargonium. It is annual or perennial herbs, which propagate by cutting in February and October (Ahmed, 1988). Geranium is among the most popular flowering plants. Outdoors, it is used as annual bedding plant, in hanging baskets, in pots and in window boxes. Indoors it is cultured as houseplants in sunny locations. The scented-leaved geraniums, T 11 Proceedings of First International Conference on STRATEGY OF BOTANIC GARDENS Bulletin of CAIM – Herbarium, Volume 7, 2006 May 10 – 12, 2006, Giza, Egypt.