Syngonium crassifolium (Engler) Croat,
crassifolia Engler, Bot. Jahrb. Syst. 37:140. 1905. TYPE: Colombia,
Antioquia, am Riachon fiber Amalfi, 1800 m, Lehmann (Sept. 1884)
plants with scandent stems; internodes 10-20 cm or more long, ca.
1 cm diam., petioles sheathed to beyond the middle; intermediate
stems climbing; petioles 15-20 cm long, sheathed ca. 2/3 their length;
juvenile blades simple, ovateoblong, abruptly acuminate at the apex,
weakly hastate at the base, 15-25 cm long, 8-13 cm wide, the anterior
lobe weakly constricted at the base, the posterior lobes 4-8 cm
long, narrowly rounded to acute at the apex. Adult plants epiphytic
or hemiepiphytic, stem to 1 m or more long, 4-6 cm diam.; internodes
to 10 cm long, much shorter near the apex, yellowish brown on drying;
petioles 45-70 cm long, sheathed 3/4 their length, the upper part
weakly flattened adaxially near the base of the blade, becoming
obtusely I-ribbed toward the sheath, the sheath free at the apex;
blades entire, ovate-hastate, abruptly acuminate at the apex, conspicuously
lobed at the base, 35-70 cm long, 23-40 cm wide, the anterior lobe
with the sides broadly rounded, sometimes weakly constricted at
the base, the posterior lobes directed outward at ca. 45' angle,
15-25 cm long, usually narrowly rounded at the apex, the sinus 6-15
cm deep, usually narrow, sometimes as broad as deep, the lower surface
slightly paler than the upper surface; primary lateral veins 10-
13 pairs, joining the midrib at ca. 30' angle, sunken on the upper
surface, raised on the lower surface; reticulate veins obscurely
visible on the upper surface, clearly visible beneath; posterior
rib prominently raised, extending straight to the apex of the posterior
lobes, naked 2-3 cm; primary collective vein less than 1 cm from
Inflorescences several, erect; peduncles 8-15 cm long;
spathe tube pale green, to 7 cm long, bluntly ribbed adaxially;
spathe blade creamy white, oblong-elliptic, 9-11 cm long, constricted
at the base and articulating along an elevated ring well above the
end of the pistillate part of the spadix; spadix ca. 12 cm long;
pistillate portion of the spadix grayish, 2-3 cm long, ca. 1 cm
diam.; staminate portion of the spadix creamy white, 8-10.5 cm long,
slightly narrower toward the apex, ca. 1.5 cm diam. midway, the
synandrium regularly 4-lobed and truncate at the apex, weakly incised
between the anthers.
Infructescences pendent, yellowish, to ca. 9 cm long
and 4.5 cm diam. Figs. 23, 24.
The species is known from Colombia and Ecuador on the Pacific slope
and in Venezuela in the state of Merida.
The species has been collected in flower from June through October
and mature fruits have been seen in late October.
ANTIOQUIA: (Photo) Lehmann 12300 (B, MO, US).
ECUADOR: COTOPAXI: Santo Domingo de Los Colorados, Ellenberg 3063
(MO). LOS RIOS: Biological Station at Rio Palenque, Croat 38661,
38678, 38700 (MO), Dodson 5538 (SEL, US), Gentry 6582, 11997 (MO).
VENEZUELA: MERIDA: Between El Vigia and El Quince, Bunting 2403