Usually epiphytic or hemiepipliytic; stem appressed-climbing, grayish green, sap strongly thyme-scented; internodes short, thick, semiglossy, 4 - 7.5 cm diam., broader than long, pale green to gray, epidermis thin, yellow, fragmented, without fissures; roots moderately lew per node, drying dark brown to ca. 5 mm diam., epidermis semiglossy, flaking; cataphylls 16-46 cm long, sharply 2-ribhed (ribs to 1.5 cm high), usually tinged red, drying brownish yellow, often glossy (as if surface is shellacked), broadly concave to broadly D-shaped adaxially, persisting semi-intact, finally as a dense mass of whitish libers; margins acute. LEAVES: Petioles 35 - 83 cm long, 1 - 2.2 cm diam., subterete to D-shaped, firm to moderately spongy, medium green, drying yellowish brown, obtusely flattened with obtuse medial rib toward apex adaxially, surface semiglossy and obtusely striate; blades ovate, suhcoriaceous, semiglossy, moderately bicolorous, acuminate to abruptly acuminate at apex (the acumen strongly inrolled, 2 - 8 mm long), cordate to sagittate at base, 30-77 cm long, (17.5)23-64 cm wide (1-1.7(2.7) times longer than wide), (0.6-1.2 times longer than petiole); upper surface dark green, semiglossy to subvelvety-matte; lower surface semiglossy or rarely matte, moderately paler; anterior lobe 23 - 57 cm long, 24.5 - 64 cm wide (1.6 - 2.7 limes longer than posterior lobes); posterior lobes 8.5-28 cm long, 10-29.6 cm wide, obtuse to broadly obtuse; sinus usually spathulate, 8-20 cm deep; midrib flat to broadly convex, paler than surface above, convex to narrowly rounded, concolorous or slightly darker than surface below; basal veins (1)6 - 7(8 - 9) per side, with 0 - 1(2) free to base, most of the remainder coalesced 1 - 5.5 cm, 2 coalesced lo 11 cm; posterior rib usually naked, 1 - 3 cm long; primary lateral veins 3 - 8 per side, departing midrib at a usually 40 - 70º angle, quilt-ed-sunken to sunken, paler than surface above, convex and slightly paler than surface below; tertiary veins visible and darker than surface below; nminor veins conspicuous, arising from both the midrib and primary lateral veins, moderately prom-inulous on drying, alternating with secretory ducts perpendicular or more frequently oblique, sometimes branching; "cross-veins" weakly parted. INFLORESCENCES erect to erect-spreading, (1)2-3 per axil; peduncle 2-9 cm long, 8÷14 cm diam., pinkish red. white striate, especially toward apex; spathe 10-17 cm long (1.9-7 times longer than peduncle), weakly constricted, oblong-ellipsoid; spathe blade light green outside, cream, pale li-neate in upper one-half inside; spathe tube green, tinged red outside, 6-9 cm long, red with conspicuous resin canals inside; spadix tapered to somewhat ovate, weakly protruding, 8.8 -14.4 cm long; pistillate portion weakly ovoid, whitish, (2)3 - 4.9 cm long, 2-2.4 cm diam. throughout, 1.4-1.5 cm diam. at apex, 1.4 - 1.9 cm diam. at middle, 1.4 - 1.8 cm wide at base; staminate portion 5.7-10.8 cm long; fertile staminate portion bluntly tapered at apex, 1.1÷1.4 cm diam. at base, 1.2 - 2.3 cm diam. at middle, 1(1.7) cm diam. ca. 1 cm from apex, broadest at upper two-thirds, broader than the pistillate portion, slightly narrower than the sterile portion; sterile staminate portion broader than the pistillate portion, 1.4 - 2.5 cm diam.; pistils (1)3÷ 3.9 mm long, 1.5 - 1.9(3.8) mm diam., margins broadly rounded and slightly raised above the apex; ovary 4-6-locular, 1.9-2.5 mm long, 1.3-1.9(3.8) mm diam., with axilc placentation; locules 1.9-2.5 mm long, 0.4 - 0.7 mm diam.; ovule sac not present or to 1.9 mm long; ovules 10-14(18) per locule, 2-seriate, rarely contained within translucent or transparent envelope, 0.1 - 0.3 mm long, longer than funicle; funicle 0.1-0.3 mm long, adnate to lower part of partition, style 0.8 - 1.2 mm long, 1.5 - 1.9(3.6) mm diam., similar to style type B; style apex barely raised, button-like, broadly concave, medial apex with a whitened margin, raised and apparently like type D on drying; stigma subdis-coid, truncate, 1.4-1.6 mm diam., 0.3 - 0.4 mm high, covering ± entire style apex, sometimes depressed shallowly and medially; the androecium truncate, oblong, prismatic, margins irregularly 4 - 5-sided, sometimes scalloped, 1 mm long, 1.8 - 2.1 mm diam. at apex; thecae ± oblong, 0.4-0.5 mm wide, ± parallel to one another; sterile, staminale flowers blunt, irregularly 4--6-sided, prismatic, 2.5 - 3.5 mm long, (1.4)1.8-2.2 mm wide. INFRUCTESCENCE with pistillate spadix 5 - 6 cm long, 3.5 cm diam.; berries white, 1.1 cm long, 4 - 4.6 mm diam.; seeds 1.4 mm long, 0.5 mm diam., cream-colored.
Ranges from Costa Rica to Panama. In Panama, this species ranges no further east than Veraguas (Cerro Tute), except for a disjunct occurrence on Cerro Jefe in Panama Province. All Costa Rican collections are from the northern slopes of the Cordillera Central in Alajue-la, Heredia, and San Jose, and the northern end of the Cordillera de Talamanca in the Tapanti region of Cartago Province. It is to be expected throughout much of the Cordillera de Talamanca.