Syngonium dodsonianum Croat, sp.
nov. TYPE: Ecuador, Los Rios, Rio Pa lenque
Biological Station, km 56 along the road between Santo Domingo and
Quevedo, 150-200 m, Dodson & Gentry 10063 (MO-2742909, holotype;
hemiepiphytica; caudex ca. 2.5 cm diam., internodiis apice 1-2 cm
diam., 1-2 cm longis; lamina simplex, tenuis, atrovirida; venis
lateralibus utroque latere 10-13, rubris, in vallibus; venis tertiariis
distinctis in sicco. Inflorescentia solitaria-; spathae tubus ellipticus,
pallide aurantiacus, apice constrictus; spathae lamina pallide aurantiaca.
creeper; stems 2.5 cm diam.; 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 diam. (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 diam. on drying, weakly constricted at the apex, ca. 2 mm
long, 1-1.5 mm diam.; 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 diam., the sterile
staminate portion broadest in the lower 1/3, gradually tapered to
the apex, drying ca. 1.3 cm diam., 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. Fig.
Syngonium dodsonianum is known only from the type
locality at the Rio Palenque Biological Station, a region of tropical
wet forest at 150-220 m in western Ecuador. It is to be expected
throughout the band of wet forest in western Ecuador and perhaps
also in Colombia.
species is most closely related to S.
crassifolium with which it is sympatric. It differs from
that species by the characters outlined in the key.
collections have been made during March and September.
LOS RIOS: Rio Palenque Biological Station, Dodson & Gentry 10063