Brenesia 16(Supl. I): 23. 1979. TYPE: Costa Rica. Puntarenas: primary forest along Río Coto Brus in the vicinity of Las Alturas, 23 km N of La Union (on Panamanian border), ca. 1,500 m, Croat 26600 (MO 2251852, holotype; B, BR, CR, F, K, NY, PMA, SEL, US, isotypes; Live at MO).
Epiphyte, sometimes terrestrial; stems 18-30 cm long; cataphylls persisting; petioles 5-22 cm long, 4-7.5 mm diam., narrowly sulcate and grooved in the sulcus, rounded abaxially; blades lanceolate to oblong-lanceolate, thin to medium thick, acute to attenuate at base, 13-30 cm long, 4÷7.5 cm wide. Inflorescence erect-spreading, peduncles 20-40 cm long, 1.5-3 mm diam., terete; spathe medium green, linear-lanceolate, 4.5-8.5 cm long, 4-9 mm wide; spadix stipitate to 3 mm or sessile, greenish yellow at base, paler at apex, 4.5-10 cm long, 3-6 mm diam. at base; berries pale yellow-green, obovoid to depressed globose, almost flat at apex, to 5 mm long. See Croat (1983: 249) for a more complete description.
Anthurium angustispadix is known from eastern Costa Rica and western Panama at elevations from 100 to 1,500 m in premontane wet and tropical wet forest life zones.
The species is perhaps best placed in section Xialophyllium and is recognized by its slender elongate stems with weathered, tan cataphylls, its lanceolate leaves, its greenish yellow, long slender spadix, and its pale yellow-green berries. It is not easily confused with any other species.
Map of Mesoamerican specimens with coordinates
Costa Rica :, 1951, Hari H8 (G).
Costa Rica Puntarenas: 1390-1440 m, 08.56N 82.50W, 13 July 1985, Michael H. Grayum & Barry Hammel 5678 (MO).
Costa Rica Puntarenas: 1160-1200 m, 08.47.30N 82.58.00W, 12 September 1985, Michael H. Grayum, Gerardo Herrera & José Berrocal 5971 (MO).
Costa Rica Puntarenas: 1150 m, 08.47.30N 82.58.00W, 27 May 1986, Michael H. Grayum, Barry Hammel & Greg de Nevers 7573 (MO).Chiriquí: NW side of Cerro Pando, Croat 15958 (MO); road to Gariche, Folsom et al. 7188 (MO); between Gualaca & Fortuna Dam site, N of Gualaca, Croat 48792, 48812 (MO); between Gualaca & Fortuna Dam site, NW of Los Planes de Homito, Croat 50105 (MO);Las Lagunas near Volcán, Page 125, 126 (MO); vicinity Los Planes de Homito, Croat 48851 (MO);along Río Chevo, Knapp 1567 (K., MO); W of Río Chiriquí Viejo, D'Arcy 10840 (MO); 7.5 mi. from bridge over Río Chiriquí Viejo, Hammel et at. 6860 (CAS, MO).