inermis and N. dubia Danser into the subgenus Montanae Danser (Danser, 1928). Nepenthes ovata, N. jacquelineae and others were not known at this time, but it seems likely he would have included them in subgenus Montanae as well. Other species that produce somewhat similarly shaped upper pitchers include N. eymae, N. jamban, N. pitopangii, N. talangensis, and N. tenuis. Nepenthes flava can be distinguished from all of these species on the basis of a combination of features: entirely yellow upper pitchers; a broad, wavy peristome; very small peristome teeth; and a narrowly ovate or elliptic lid that lacks appendages (or has a small basal crest). Furthermore, compared to many of these species, and particularly N. eymae, N. flava is a diminutive plant. Natural hybrids Two natural hybrids involving N. flava have been recorded; the describing authors found examples of crosses with N. ovata and N. rhombicaulis. Most of the observed hybrids were young rosette plants. Although N. flava is also sympatric with N. mikei and N. spectabilis, no natural hybrids with these species have been recorded. References External links Habitat photographs of Nepenthes flava Carnivorous plants of Asia flava Plants described in 2007