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The new species,    Thliphthisa   sapphus    sp. nov.  (  Rubiaceae  ,   Rubieae  ), a narrow endemic of the white cliffs of Lefkátas on the southwest coast of Lefkada (Greece) is described and illustrated and an IUCN assessment is presented. Vegetation relevés were performed at the single known locality, limestone cliffs facing the sea and revealed a new association, the    Thliphthisa   sapphus   -   Lomelosietum   dallaportae   . The chromosome number of    Thliphthisa   sapphus    was determined as 2 n  = 4 x  = 44, being the single tetraploid species in the genus to date. The species also differs markedly morphologically from its morphologically closest relatives, two Greek steno-endemic oreophytes,    Th.   baenitzii    and    Th.   muscosa    by the following characters: densely setose mericarps and corolla, tetraploidy and by its distribution. An identification key for the Greek species of    Thliphthisa    is provided.    Th.   sapphus    constitutes the westernmost outpost of a group of Greek steno-endemics, highlighting the importance of coastal habitats and their protection as refugia for poorly competitive chamaephytes.

﻿ Thliphthisa sapphus ( Rubiaceae , Rubieae ), a new species from Lefkada (Ionian Islands, Greece) and its ecological position

Thliphthisa sapphus ( Rubiaceae , Rubieae ), a new species from Lefkada (Ionian Islands, Greece) and its ecological position