Syngonium hastifolium Engler, Bot.
Jahrb. Syst. 37:41. 1905. TYPE: Brazil, Amazonas,
Rio Jurua at Fortaleza, Ule 6010 (B, holotype)
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.
The species is known only from the type collection.
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
type collection was in flower in October.
an illustration of this species see Field Museum type photo #12293.
AMAZONAS: Fortaleza, Ule 6010 [B, MO (Photo)].