<i>Hoya buntokensis</i> (<i>Apocynaceae</i>, <i>Asclepiadoideae</i>), a new myrmecophytic species and <i> Hoya wallichii</i> subsp. <i> tenebrosa</i>, a new subspecies from Borneo (Kalimantan, Indonesia)

We describe a new Hoya species from Central Kalimantan, H. buntokensis , and subspecies of wallichii West subsp. tenebrosa . is part group four that form specialised leaf structures harbouring ants (here defined as megadomatia), it most similar to undulata differs in lamina margin (flat vs undulate); shape corona lobes outer processes (fan shaped elliptic), the pollinarium morphology (corpusculum larger than pollinia corpusculum smaller pollinia). Both are slender plants with ovate oblong, thinly coriaceous glabrous leaves, peduncles 1 or 2 flowers open at time, broadly campanulate corollas. corolla colour (dark purple paler edge white-cream), lobe surface (broadly elliptic, spreading minute inner process, almost black velvety kidney-shaped, erect well-developed acuminate shiny surface).