P. subsect. Canniphylla (Schott) Mayo, Bot. J. Linn. Soc.
100. 168. 1989.
P. grex Canniphyllum Schott, Syn. Aroid. 76. 1856.
TYPE: P. fibrillosum Poepp.
This is a small group which included only five species in Krause's revision and one of these, P. coerulescens, proved to be a synonym of P. inaequilaterum, a member of P. subg. Pteromischum. Philodendron juninense Engl., P. fibrillosum, and P. cuneatum Engl. are all Andean species while the no doubt distantly related P. blanchetianum Schott is a species from eastern Brazil in Bahía. Philodendron subsect. Canniphylla has only a few species in Central America. Both Philodendron cretosum and P. roseospathum have persistent fibrous cataphylls and resemble the type species, P. fibrillosum (selected by Mayo, 1990). The only other Central American species which has characteristics to fit in the subsection is P. chirripoense, which is tentatively placed here, though it differs in having longer, more slender internodes and lacks persistent cataphylls. The presence or absence of persistent cataphylls is highly correlated with the length of internodes (persistent when internodes are short, deciduous when internodes are long) and thus it is not surprising that P. chirripoense would lack cataphylls. Still, the latter is a most peculiar species so its placement remains in doubt.