Philodendron sagittifolium Liebm.

Ortiz, Orlando Oriel, de Stapf, María Sánchez, Baldini, Riccardo Maria & Croat, Thomas Bernard, 2019, Synopsis of aroids (Alismatales, Araceae) from Cerro Pirre (Darién Province, Panama), Check List 15 (4), pp. 651-689 : 682

Philodendron sagittifolium Liebm.

Material examined. Middle slopes on W side of Cerro Pirre; 07°57′N, 077°46′W; 550–760 m; 28 Jun. 1988; T. B. Croat 68893 ( MO). Ibid.; 07°56′N, 077°45′W; 800–1050 m; 29 Jun. 1988; T. B. Croat 68958 ( MO).

Identification. Philodendron sagittifolium is a very variable species (Croat 1997). This species is distinguished mainly by having robust stems, short internodes, intact and deciduous cataphylls, rigid petioles with purple spots, coriaceous ovate-triangular blades, non-naked posterior ribs, inflorescences with green spathes exter- nally (frequently with purple spots on spathe tube), and internally reddish spathe tubes. On Cerro Pirre, this species is similar to P. edenudatum Croat , due to the blade shape (see distinctive aspects in the notes for P. edenudatum ).

Distribution and ecology. Belize, Colombia, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, Panama, and Venezuela. According to the collection information, P. sagittifolium ocurrs in evergreen and submontane forests of Cerro Pirre, between 550 and 1050 m.