Septemeranthus (Loranthaceae), a new monotypic genus from the Andaman and Nicobar Islands, India and its relationship with allied genera.

A new showy mistletoe genus, Septemeranthus L.J. Singh with a type species, S. nicobaricus L.J. Singh sp. nov., is described and illustrated from the Andaman and Nicobar Islands, India. It is an aerial branch hemi‐parasite on Horsfieldia glabra (Blume) Warb. (Myrsticaceae). The conservation status, host inventory, germination ecology and remarks on its relationship with allied genera are given. Septemeranthus is distinct in vegetative morphology, inflorescence architecture and floral characters: leaves with long apex, camptodromous venation, coraceous, 5 bracts with brown margins, 3‐7 flowered racemose, 7 merous flowers, urceolate ovary, earthen pot shape fruits with prominent bracts and seeds with dark vertical streaks. [ABSTRACT FROM AUTHOR]