Nepenthes higaonon (Nepenthaceae), a new species of pitcher plant from the northern Mindanao, Philippines

Nepenthes higaonon (section Alatae) is described as a new species from the gravel substrates of northern Mindanao, Philippines. It is morphologically similar to N. viridis from which differs in having a non-decurrent leaf-to-stem attachment (vs. slightly decurrent in N. viridis), rounded leaf apex (vs. acute), 3 longitudinal veins on each side of the midrib (vs. 1–2), monomorphic pitchers (vs. dimorphic) aerial pitchers cylindrical upper 1/3rd (vs. infundibular upper 1/3rd), aerial pitcher lid flattened, ovate, angled up to 90° completely exposing the opening (vs. domed, oval to cordate, angled up to ca. 60 ° covering the opening), aerial pitcher peristome anterior with shallow depression (vs. often raised), inflorescence 1-flowered (vs. 2-flowered), and by its climbing stems up to ca. 10 m (vs. up to ca. 4 m). The species described is assessed herein as Critically Endangered according to IUCN criteria, facing threats of poaching, shifting cultivation, without legislative protection and calls for immediate conservation efforts.