Anthurium maasii Croat

Semierect vine; caudex to 1.5 m tall, with long slender roots c. 1 mm diam. extending from the nodes; internodes elongated, 2.5–3.5 cm long, c. 5 mm diam.; cataphylls 7.5–9.5 cm long, deciduous. Leaves  spreading from the elongated caudex; petiole terete, 7.4–9 cm long, c. 2 mm diam., drying dark yellow-brown; blade ovate-elliptic, long-acuminate at apex, obtuse at base, 18–19 cm long, 5–6.5 cm wide, 3.2–3.6 × longer than wide, 2–2.5 × longer than petiole, semicoriaceous, drying weakly glossy and dark yellow-brown above, semiglossy and light yellow-brown below; upper surface minutely granular, lower surface with subcylindrical pustules; midrib narrowly raised and drying slightly darker than the surface above, rounded and drying light brown below; primary lateral veins 6–7 pairs, arising at 40–50° angle and arching towards the apex, slightly raised above and below; collective veins arising from the first pair of basal veins, 3–5 mm from margin; basal veins 2 pairs, both free to the base, the 2nd pair weak and confined to the base of the blade; tertiary veins prominulous and reticulate. Inflorescences erect; peduncle slender and elongated, c. 13 cm long, 1 mm diam., drying dark yellow-brown; spathe lanceolate, c. 6 cm long, 7 mm wide, green; spadix yellow, stipitate for 2 mm, cylindrical, 6.5–9 cm long, 3 mm diam., drying dark brown. Flowers 1.7–1.8 mm long, 0.7–0.8 mm wide (dried), 5 visible per spiral, smooth, drying dark yellowbrown; lateral tepals 1.1–1.2 mm wide, the outer margin broadly 2-sided, inner margin nearly straight, often curled outward upon drying; stamens barely emergent, closely arranged around pistil, 0.2 mm long, 0.25 mm wide, thecae ovate, slightly divaricate.