Lagenandra rubra (Araceae), a new endemic species from Sinharaja Man and Biosphere Reserve, Sri Lanka

During the revision of the genus Lagenandra in Sri Lanka we encountered a new species Lagenandra rubra from the Sinharaja Man and Biosphere Reserve of Sri Lanka. The new species can be differentiated from all other described Lagenandra species by its glossy dark red-maroon twisted limb and the absence of warts on the spathe. With the newly described species, the number of endemic Sri Lankan species of Lagenandra rises to fourteen, and the global total rises to twenty-three. Based on the IUCN Red List categories and criteria, the new species is assessed as Critically Endangered under Criterion CR B1ab (ii, iii, iv, v) +2ab (ii, iii, iv, v).