This is the second largest flowering category, consisting of 30 species (32 taxa) which are believed to flower exclusively in the wet season (roughly between May and December in Central America). They represent largely rare or narrowly distributed species for the most part and are often species that inhabit the wettest and frequently the coolest forest types such as Tropical wet (T-wf), Premontane wet (P-wf), Premontane rain (P-rf) and Lower montane wet forest (LM-wf). Examples of species in such flowering types include P. albisuccus, P. antonioanum, P. chiriquense, P. coloradense, P. correae, P. cotobrusense, P. dominicalense, P. dodsonii, P. ferrugineum, P. gigas, P. hammelii, P. jefense, P. madronoense, P. niqueanum, P. pirrense, P. purulhaense, P. squamicaule, and P. ubigantupense.

Not all species which flower exclusively in the wet season are species which occur in very wet or cool forest. A few species flower only in the wet season because the dry season in the region where they occur is often too severe, perhaps so severe as to limit the beetle pollinators. These include several Mexican species including P. basii, P. breedlovei, P. dressleri and P. sousae.