Matuda, Revista Soc. Mex. Hist. Nat. 11:94-95. 1950.
Mexico, Chiapas, Piedra de Huixtla, Matuda 18619 (MEXU, holotype;
llamasii Matuda, Cact. & Sucul. Mexico
2:79, fig. 52. 1957. TYPE: Mexico, Chiapas, El Suspiro, near Ocozocuautla,
600 m, Matuda 32637 (MEXU, holotype).
plants with glaucous stems; internodes 5-23 cm long, less than 1
cm wide; petioles sheathed 1/2-3/4 their length, blades ovate-cordate,
9-30 cm long, 5-17 cm wide, acuminate at the apex. Adult plants
with stems green, usually glaucous; internodes 12-20 cm long, becoming
closer at the apex, 2-6 cm long, 2.5-4 cm diam.; petioles 30-60
cm long, sheathed about 4 A their length, subterete above the sheath,
weakly flattened on the upper surface; blades with the upper surface
matte, seldom weakly glossy, the lower surface matte, much paler,
ovatecordate to 3-lobed, abruptly acuminate to obtuse-mucronate
at the apex, the entire blade with the anterior lobe 28-65 cm long,
18-35 cm wide, broadest at about the middle, only slightly or not
at all constricted at the base, the posterior lobes rounded or subhastate,
the sinus very narrow or open and broader than deep, the posterior
rib sometimes naked 5-20 mm; 3-lobed blades with the anterior lobe
broadly ovate, 28-52 cm long, abruptly constricted at the base and
confluent with the posterior lobes, the latter ovate to obovate,
10-20 cm long, directed backwards or at ca. 90' angle to the anterior
lobe, acute to narrowly rounded at the apex, bluntly auriculate
at the base on the lower side; primary lateral veins mostly 5-8(-10)
pairs, slightly sunken; the primary lateral veins convexly raised,
the tertiary veins clearly visible.
Inflorescences 1-3; peduncles to ca. 10 cm long and
erect at anthesis, green and glaucous, 12-18 cm long and pendent
in fruit; spathe tube ellipsoid to oblong-ovoid or cylindroid, greenish
outside, glaucous, 5-7 cm long, to 3 cm diam. inside, yellowish
white at the base, purplish at the apex; spathe blade broadly elliptic,
white, shortly cuspidate at the apex, 5-9 cm long, 5-7 cm wide;
pistillate portion of the spadix 3-4 cm long, the ovary ca. 5 mm
long, 3 mm wide; staminate portion of the spadix ca. 5-9 cm long,
to 1.5 cm diam., the staminate flowers ca. 3 mm long, the anthers
Figs. 5, 22.
Syngonium chiapense is known for certain only from
southern Mexico (Oaxaca and southern Veracruz), but a sterile collection
from Guatemala (Baja Verapaz) also appears to be this species. The
species occurs only on the Atlantic coast from sea level to more
than 1200 m but most commonly occurs above 350 m in life zones ranging
from tropical moist forest through tropical wet forest.
chiapense is perhaps most closely related to S.
macrophyllum. The two species have nearly identical juvenile
leaves and both have glaucous stems and inflorescences in Mexico.
The adult foliage of S. macrophyllum with 7-9 free leaflets
is never confused with this species which is commonly entire or
with merely a single pair of confluent posterior lobes.
have been seen July-September.
BAJA VERAPAZ: S of Purulha, Croat 41218 (MO).MEXICO:
CHIAPAS: Comaltitldn, Matuda 17882 (MEXU); N of Ocozocoautla, Croat
40662 (MO); Piedra de Huixtla, Matuda 18619 (DS, MEXU). OAXACA:
Vicinity of Valle Nacional, Croat 39720, 39754, 39805, 43913 (MO),
48016 (CAS, MO, MEXU), Moore & Bunting 8895 (BH, MO). VERACRUZ:
E of Coatzacoalcos, Croat 40060 (MO); S of Catemaco, Moore &
Bunting 8926 (MO), 8938 (BH, MO).