THE PHYLOGENETIC SIGNIFICANCE OF FRUIT STRUCTURAL VARIATION IN THE TRIBE HETEROMORPHEAE (APIACEAE)

摘要

Fruit structure of Apiaceae was studied in 19 species representing the 10 genera of the tribe Heteromorpheae. Ourresults indicate this group has a woody habit, simple leaves, heteromorphic mericarps with lateral wings. fruits with bottleshapedor bulging epidermal cells which have thickened and cutinized outer wall, regular vittae (one in furrow and two incommissure) and irregular vittae (short, dwarf, or branching and anatosmosing), and dispersed druse crystals. However,lateral winged mericarps, bottle-shaped epidermal cells, and branching and anatosmosing vittae are peculiar in the tribeHeteromorpheae of Apioideae sub family. Although many features share with other early-diverging groups of Apiaceae,including Annesorhiza clade, Saniculoideae sensu lato, Azorelloideae, Mackinlayoideae, as well as with Araliaceae. Ourstudy shows that fruit anatomy can be used to define the tribe by molecular phylogenetic studies and support thatHeteromorpheae are close to Annesorhiza clade and both are placed in the basal position of Apioideae.