Syngonium chocoanum Croat, sp. nov.
TYPE: Colombia, Choco, Municipio of Novita, slope N of Cerro Torra
Filo ridge E of Rio Surama, along trail to Alto del Oso, 500-600 m,
Forero, Gentry, Sugden & Daly 3324 (COL, holotype; MO2604930,
hemiepiphytica; caudex ca. 2 cm diam., internodiis brevibus; lamina
simplex; petiolus usque 5-6 cm e apice vaginatus; lamina anguste
ovata, basi cordata; folia venis lateralibus utroque latere 9-15,
infimis ramosis; venis tertiariis tenuibus, approximatis, obscuris.
Inflorescentia ignota; spatha fructifer viridis, oblonga-elliptica,
8 cm longa.
creeper; stems ca. 2 cm diam.; internodes short, those on the upper
part of the stem ca. 1 cm long; cataphylls thin, ca. 19 cm long,
ca. 1 cm wide; petioles to 43 cm long, narrowly sheathed to within
5 cm of the apex, the margins of the sheath to 1 cm high, markedlv
broadened within 6 cm of the base, acute and tree-ending at the
apex (the free part ca. 1.5 cm long, the unsheathed part of the
petiole ca. 3 mm diam. (dried); blades entire, moderately thin,
narrowly ovate, acute or bluntly acuminate at the apex, narrowed
and cordate at the base, 26-36 cm long, 14-23 cm wide, the posterior
lobes narrowly rounded; primary lateral veins 9-1-) pairs, arising
at ca. 45-50' angle, straight or weakly curved to the collective
vein, with prominent branches (especially in the lower half of the
blade) these curved and closely paralleling the primary lateral
veins; tertiary veins obscure (at least on drying), close, markedly
parallel; collective veins 3, obscure, the first ca. 5 mm from the
margin; basal veins 4 or 5 pairs, the lowermost 3-4 basal veins
coalesced ca. 5 mm before the base.
Inflorescences Solitary(-); flowering spathe not seen.
Infructescences with the peduncles to 11 cm long,
6 mm diam. (dried) midway, smooth, fruiting spathe tube narrowly
elliptic, green, 8 cm long, 4 cm diam.; syncarp oblong-elliptic,
5.5 cm long, 4 cm diam., tan. Fig. 6.
DISTRIBUTION: Syngonium chocoanum is known only from
the southern part of the Choco Department, Colombia, in tropical
wet forest. It is apparently related to both S.
hastiferum from Costa Rica and S.
meridense from western Venezuela, differing from both in
having fine, closely parallel tertiary veins. It differs from S.
hastiferum in having an open sinus with rounded posterior lobes.
It differs from S. meridense in having a narrower sinus (versus
broad and open in S. meridense). In respect to the sinus
alone S. chocoanum lies intermediate between S. hastiferum
and S. meridense, but the very different venation is sufficient
to distinguish the species.
CHOCO: Municipio de Novita, N of Cerro Torra Filo, Forero et al.
3324 (COL, MO); Valley of Rio San Juan, Quebrada La Sierpe, Forero
et al. 3965 (COL, MO).