10. Syngonium hastifolium Engler, Bot. Jahrb. Syst. 37:41. 1905. TYPE: Brazil, Amazonas, Rio Jurua at Fortaleza, Ule 6010 (B, holotype)

Scandent hemiepiphyte; stem thick; petiole ca. 25 cm long, sheathed more than 3 A of its length, the sheath free-ending and rounded at the apex; blade entire, acuminate at the apex, conspicuously hastate at the base, 20-25 cm long, the anterior lobe 15-18 cm long, 7.5-8.5 cm wide, constricted at the base, ca. 6.5 cm wide at the constriction, the sides broadly rounded, the posterior lobes slightly unequal, directed outward at ca. 45' angle, 10-11 cm long, 4-4.5 cm wide at their widest point, almost acute at the apex; the primary lateral veins 4-6, per side, joining the midrib at 30-45' angle; primary collective vein ca. 4 mm from the margin; posterior rib extending straight to the tip of the posterior lobe.
Inflorescences several, erect; prophylls linear-oblong, acute at the apex, 10-15 cm long; peduncles 5-6 cm long; spathe tube oblong, ca. 4 cm long, ca. 1 cm diam.; spathe blade ovate-oblong, acute at the apex, 6-7 cm long, ca. 5 cm wide; pistillate portion of the spadix ca. 1.5 cm long, ca. 5 mm diam.; staminate portion of the spadix ca. 5 cm long, ca. 1 cm diam. (dried) -
Infructescences unknown. Fig. 11.

DISTRIBUTION: The species is known only from the type collection.

It is believed to have a close affinity with S. podophyllum and may merely represent an unusual, prematurely flowering individual since the leaves are virtually identical to the pre-adult leaves of that species.

The type collection was in flower in October.

For an illustration of this species see Field Museum type photo #12293.

BRAZIL: AMAZONAS: Fortaleza, Ule 6010 [B, MO (Photo)].