The Flora of Peninsular Malaysia Series II provides revisions for seed plant families that occur in Peninsular Malaysia. Volume 1 includes general chapters on the seed plant families and vegetation types in Peninsular Malaysia. Species assessment and conversation of seed plants are discussed. Revisions for 26 families, 35 genera and 81 species are provided that include descriptions and keys for the genera and species with conversation status and distribution maps provided for species. Representative species are illustrated by botanical plates and colour photographs.