Syngonium dodsonianum Croat, Ann. Missouri Bot. Gard. 68(4): 592. (1981).
Hemiepiphytic creeper; stems 2.5 cm dia.; internodes 1–2 cm long near the apex, drying brown with close longitudinal wrinkles; petioles 45–73 cm long, sheathed ca. 2/3 their length, the upper part subterete, the sheath 8–10 cm high, free-ending at the apex; blades simple, ovate, acute to abruptly acuminate at the apex, conspicuously lobed at the base, 42–53 cm long, 23–31 cm wide, thin, dark green (drying dark olive green, papyraceous), the anterior lobe 30–35 cm long, not at all constricted toward the base, the posterior lobes directed downward or slightly inward, acutely rounded at the apex, sometimes unequal, sometimes weakly constricted near the apex; midrib flat at the base, becoming weakly sunken toward the apex (at least on drying); primary lateral veins 10–13 pairs, reddish, in deep valleys; tertiary veins fine, close, distinct (at least on drying); basal veins 3–5 pairs, 3 of them coalesced 3–5 cm; posterior rib naked 2.5–3 cm, directed straight to the tip of the posterior lobe; primary collective vein 3–8 mm from the margin, weakly loop-connecting the primary lateral veins. Inflorescences solitary(?); peduncles ca. 9 cm long, 5–8 mm dia. (dried); spathe ca. 15 cm long; spathe tube ovoid-oblong to oblong-elliptic, 6.5–7.5 cm long, orange red, prominently constricted at the apex; spathe blade light orange red to yellow orange with reddish veins, acuminate at the apex; spadix ca. 11.5 cm long; pistillate portion of the spadix grayish, 2–2.5 cm long, 6–10 mm dia. on drying, weakly constricted at the apex, ca. 2 mm long, 1–1.5 mm dia.; staminate portion of the spadix creamy white, the sterile staminate portion ca. 2 cm long, constricted gradually toward the apex, drying 2–3 mm long, 1.5–3 mm dia., the sterile staminate portion broadest in the lower l/3, gradually tapered to the apex, drying ca. 1.3 cm dia., the flowers more or less trapezoidal, the margins weakly crenate, the apex weakly depressed medially with no sign of fusion of the anthers. Infructescences not known.
Type: Ecuador, Los Ríos, Río Palenque Biological Station, Km 56 along the road between Santo Domingo and Quevedo, 150--200 m, Dodson & Gentry 10063 (MO-2742909, holotype; SEL, isotype).
Los Rios: Rio Palenque Biological Station, Km 56 along the road between Santo Domingo and Quevedo 150--220 m, 0°35'S, 79°22'W, 31 Mar 1980, Dodson & Gentry 10063 (QCNE).