Material examined. El Real, Parque Nacional Darién, high camp and ridge of Cerro Pirre; 07°57′42″N, 077°42′14″W; 1302 m; 28 Jul. 2011; J. L. Clark 12665 (MO, PMA). Middle slopes on W side of Cerro Pirre; 07°57′N, 077°46′W; 550–760 m; 28 Jun. 1988; T. B. Croat 68867 (MO). Ibid.; 07°57′N, 77°46′W; 550–760 m; 28 Jun. 1988; T. B. Croat 68889 (MO). Cerro Pirre, valley between between Pirre and next most southernly peak, sloping hillside; 07°40′N, 077°42′W; 1250– 1300 m; 10 July 1977 - 20 July 1977; J. P. Folsom 4399 (MO). Ibid.; J. P. Folsom 4400 (MO). Parque Nacional Darién, Serranía de Pirre, Rancho Plástico; 07°59′13″N, 077°42′28″W; 1127 m; 30 Jul. 2016; O. O. Ortiz 2632 (MO, PMA). Ibid., campamento cerca del segundo mirador; 07°59′49″N, 077°42′43″W; 610 m; 17 Jul. 2016; O. O. Ortiz 2725 (PMA). Ibid., Rancho Plástico; 07°58′57″N, 077°42′30″W; 1128 m; 18 Jul. 2016; O. O. Ortiz 2730 (PMA).

Identification. This species is characterized by its ovate-triangular, greenish blades (when dry); violet-purple spadices and especially by their round and prominent stigmas. On Cerro Pirre, this species is very similar to A. ravenii Croat & R.A. Baker (for differences, see the notes on the latter species).

Distribution and ecology. Colombia and Panama. In the study area, the populations of this species occur mainly in the transition area between the submontane and montane forest, which is approximately between 1050 and 1100 m. Individuals can also be seen sporadically in the montane forest (> 1100 m). Apparently this species has a preference for slightly open areas with exposure to direct light of the sun.