A new species, Colchicum chlorobasis (Colchicaceae), endemic to S Turkey, is described. The species is related to C. boissieri but differs mainly in having a larger, more rounded corm with only short lobes, browner more evanescent tunics projecting along the cataphyll, and more leaves. Both have greenish filament bases. Comparisons are also made with C. sieheanum and C. baytopiorum. A key and illustrations are provided to distinguish these four species, and their distribution is shown on a map. Chromosome numbers have been determined for C. chlorobasis, C. boissieri and C. baytopiorum.

Six new species of Colchicum (Colchicaceae) are described (C. munzurense, C. minutum, C. sanguicolle, C. micaceum, C. heldreichii, C. inundatum). The first two flower in early spring with synanthous leaves, the rest are autumn-flowering. All are endemic to Turkey, and confined to small geographical areas. Chromosome numbers and notes on phenology, vegetative reproduction, phytogeography and ecology are provided for all the species.

Turkish autumn-flowering species of Colchicum (Colchicaceae) with large, broad hysteranthous leaves are taxonomically and morphologically revised, with comments on conditions in other areas covered by the distributions. Three new species are described (C. paschei, C. dolichantherum, C. imperatoris-friderici), all endemic to Turkey. Synonym lists, typifications, chromosome numbers, and notes on phenology, vegetative reproduction, phytogeography and ecology are provided for the whole group, and relationships to other species are discussed.