Synopsis of aroids (Alismatales, Araceae) from Cerro Pirre (Darién Province, Panama) Author Ortiz, Orlando Oriel Author de Stapf, María Sánchez Author Baldini, Riccardo Maria Author Croat, Thomas Bernard text Check List 2019 2019-08-16 15 4 651 689 http://dx.doi.org/10.15560/15.4.651 journal article 10.15560/15.4.651 1809-127X Philodendron ensifolium Croat & Grayum subsp. ensifolium Material examined. Middle slopes on W side of Cerro Pirre; 07°56′N , 077°45′W ; 800–1050 m ; 29 Jun. 1988 ; T . B . Croat 68922 ( MO ). Cerro Pirre, cloud forest and/ or mossy forest; 07°50′N , 077°44′W ; 750–1300 m ; 9–10 Aug. 1967 ; J . A . Duke E 13738 ( MO ). Identification. This taxon is recognized by its nomadic vine life form (appressed-climbing habit), fully sheathed petioles, very narrow glossy blades (more than four times longer than wide), non-cordate at base, with obscure primary lateral veins. Philodendron ensifolium subsp. ensifolium is the only taxon of the subgenus Pteromischum on Cerro Pirre that has finely striate, greenish stems when dry. Distribution and ecology. Colombia , Costa Rica , Ecuador , and Panama . This species has only been reported in the submontane forest of Cerro Pirre, between 800 and 1050 m .