This field guidebook, which is handy, exhaustive, inexpensive, portable and user-friendly, identifies 338 plant species, found in 75 families from Tanzania and neighbouring countries. The field guidebook will act as a platform for understanding and conserving our biological diversity thus, helping more people in identifying plants for the purpose of conservation, sustainable use and greater appreciation of biodiversity. The guidebook is unique as the identification keys are based on coloured photographs, to enable users make positive identification, minimize time and effort in identifying plants, as well as enjoyment from using it. Plants are identified by local names, Kiswahili (the national language of Tanzania), English and Latin names. The guidebook is furnished with glossaries of botanical terms, with illustrations of leaf types, shapes, phyllotaxis, and types of inflorescence and fruits.