Anthurium cogolloanum
Terrestrial or hemiepiphytic; stems short, internodes (1)3-6 cm diam.; cataphylls 19-30 cm, drying reddish brown, weathering into fibers, persisting at upper nodes. LEAVES with petioles erect-spreading, 75-130 cm long, equal to or up to 1.5 times longer than blade, 10-15 mm diam., square or sometimes D-shaped in cross section, with thin, brittle, spreading wings at corners, medium green and semiglossy; geniculum 2 cm long, square in cross-section with winged margins, undulate; blades pendent, ovate, sagittate, narrowly acuminate with acumen slightly down-turned, prominently and deeply lobed at base, 72-120 cm long, 30-70 cm wide, 1.5-3 times longer than broad, broadest at point of petiole attachment, semiglossy and dark green above, weakly glossy to matte and slightly paler below, both surfaces drying brown (B&K: yellow 4/5; RHS #165 A: Beech Brown); anterior lobe 60-90 cm long, 20-35 cm wide, nearly 3 times longer than broad, margins nearly straight, sometimes undulate; posterior lobes 25-30 cm long, 20-35 cm wide, nearly as broad as long, rounded at apex, sinus spathulate to obovate, 15-30 cm deep; midrib slightly raised above, quadrangular to round-raised below with thin, spreading wings at corners towards base, drying with an acute medial rib; basal veins 7-9 pairs, slightly raised in deep valleys above, narrowly acute to knife edged below, ca. the first 5 branching from posterior rib in 2-3 cm increments, the remainder branching from the same point where naked portion of rib ends, posterior ribs naked for 8-15 cm; primary lateral veins 23-28 per side, weakly raised in deep valleys above, acutely raised below, departing midrib at 55-60° angle, ascending nearly straight to collective veins; collective veins arising from the 4th-6th basal veins, prominently raised below; tertiary veins prominently raised and darker than surface below. INFLORESCENCE with peduncle spreading, 40-65 cm long, ca. 1 cm wide, terete to square in cross-section, sometimes with thin, spreading wings; spathe white, lanceolate, 9-15 cm long, 1.5-2.5 cm wide, reflexed, inserted on peduncle at 60° angle, gradually acuminate at apex, the margins meeting acutely at base; spadix sessile to stipitate, stipe 3-8 mm, dark violet-purple or maroon, cylindrical, (14)25-30 cm long, 1 cm wide, erect, held at ca. 90° angle to peduncle; flowers rhombic, 12-14 visible in principal spiral, 2 mm long, 1.6 mm wide, the sides straight, lateral tepals 0.6 mm wide, 1.3 mm long, inner margins convex; pistils weakly exserted. INFRUCTESCENCE with purple berries which are white at the base.
Anthurium cogolloanum is endemic to regions of pluvial forest or its transitional life zones at 200-500 m in the Choco Department of Colombia. It is a member of section Belolonchium and is characterized by its ovate-cordate leaves which dry brown, and by its petioles which are square in cross-section and have thin wings at the corners that continue undulating across the geniculum and onto the midrib, basal rib, and primary veins of the blade. Two specimens (Croat 67446 and Billet S 2638) obtained from cultivation at the Brussels Botanical Garden in Meise are identified here as A. cogolloanum, though these differ from other specimens in having leaves that dry green, blades broadest posterior to petiole attachment (vs. at petiole attachment), petioles shorter relative to blades, primary lateral veins numbering 12-15 (vs. 23-28), and collective veins arising from the 2nd (vs. the 4th-6th) basal vein.