Anthurium decurrens Poepp.

Epiphyte; internodes usually short, sometimes to as much as 1 cm long, ca 5 mm diam; cataphylls 2–3.5 cm long, initially pale fibrous, a few fibers persisting at upper nodes, then deciduous; petioles 6–11 cm long, drying 2–4 mm diam, flattened adaxially with lateral wings, sheathed (1.7)3.2–4.3 cm, 0.25–0.45 percentage of their length; blades 16–32 cm long, 3.7–11 cm wide, 2.1–4.8(6.8) times longer than broad, narrowly oblanceolate to nearly obovate, prominently tapered toward the base and often with margin in the basal half of the blade concave, acute to obtuse, rarely subrounded finally abruptly long-acuminate at apex, acute, obtuse to rounded at the base; midrib drying convex on both surfaces; primary lateral veins 8–10 per side, arising from one of the lower primary lateral veins, usually from the lowermost, prominently loop-connected; upper surface drying gray-green to dark yellow-brown, matte; lower surface drying greenish yellow to yellow-brown, semiglossy. Inflorescence subpendent; peduncle 26.5 cm long, usually 3–4-winged, rarely terete; spathe green, erect-spreading; spadix 6–11 cm long, drying 2–5 mm diam, prominently stipitate to 2–2.3 cm long (stipe drying 1–1.5 mm diam), green to beige, becoming purple in fruit; anthers yellowish. Infructescence not seen.

Discussion: Anthurium decurrens ranges from southern Colombia to Ecuador (Napo, Pastaza), Brazil(Acre) and Peru (Amazonas, Loreto) in the Amazon basin at 225–300(440) m. The species is most closely related to A. ceronii Croat that also has a quadrangular petiole. That species differs in having blades typically much broader toward the apex with the margin in the basal half of the blade often concave and with the petioles sheathed 2/3–3/4 their length. Alternatively A. decurrens has narrower blades that are not concave in the lower half of the blade or if concave the concave portion does not extend to the base of the blade. In addition the petiole sheath of A. decurrens is sheathed from 1/4 to less than 1/2 of the petioles.