Araceae
Anthurium alstonii Croat
SUMMARY
Terrestrial plant, caudex elongated with adventitious roots; internodes c. 1.5 cm diam.; cataphylls 13–20 cm long, 3 cm wide at base when unfolded. Leaves with petiole green, sulcate at base, terete toward apex, geniculate, 48–61 cm long, c. 8 mm diam. at base, 3–4 mm diam. at top; geniculum 2–2.5 cm long, concolorous with petiole; blade broadly ovate-cordate, wider below the middle and triangular in the upper half, shortly acuminate at apex, 30–47 cm long, 20–27 cm wide, averaging 36 × 23 cm, c. 1.5 × longer than wide, c. 0.65 × as long as petiole, metallic green and matte above, pale green and moderately glossy below; sinus somewhere between parabolic and arcuate; midrib narrowly raised and concolorous above, prominently round-raised and lighter below; primary lateral veins 11–14 pairs, arising at 30–40° angle, narrowly raised and concolorous above, round-raised below, concolorous with midrib; tertiary veins prominulous; collective veins generally arising from the 2nd–4th pair of basal veins, 2–4 mm from margin; basal veins (2–)4–5 pairs, all free to the base. Inflorescences erect; peduncle terete, much thinner and shorter than petioles, 13–25 cm long, c. 2 mm diam.; spathe membranaceous, linear-lanceolate and acuminate, clasping the base of the stipe, 5–11 cm long, 0.8–1 cm wide, light green or green; spadix stipitate for 7–15 mm, cylindrical, 6–16 cm long, 4–10 mm diam., white or cream. Flowers 1.3–1.6 mm long, 1.3–1.4 mm wide, 5–6 visible per spiral; tepals pale manilla, moderately smooth with thick pale granular inclusions, lateral tepals 0.8–0.9 mm wide, outer margins 2–3-sided, inner margins broadly rounded.