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16. Syngonium atrovirens Bunting, Acta
Bot. Venez. 11:323. 1975. TYPE: Venezuela, Zulia, Hacienda Raizado
(Hda. San Benito), ca. 1 km S of Concha, Bunting 2776 (MY-0254, holotype;
S. apurense Bunting,
Acta Bot. Venez. 11: 322. 1975. TYPE: Venezuela, Apure, Reserva Forestal
San Camilo, 7 km E of La Ceiba, 16 km E of El Jordan, 200 m, Steyermark,
Bunting & Blanco 101942 (MY, VEN).
Scandent hemiepiphytes. Juvenile plants with petioles sharply sulcate,
the margins narrowly winged; blades dark green, glossy above, pale
beneath. Adult plants with stems 1.3-1.5 cm diam., gray glaucous when
young, the epidermis brown and cracked in age; lower internodes 6-9
cm long, the upper internodes 2-4 cm long; petioles 25-35 cm long,
gray glaucous, sheathed except for the upper 5-9 cm, the sheath inrolled,
sometimes with elevated whitish striations, the unsheathed part sharply
angular-winged adaxially, the lateral margins sharp, narrowly winged;
blades trisect, thin to subcoriaceous, 20-25 cm long, dark green and
often glaucescent above, paler green beneath, semiglossy; leaflets
usually markedly free and petiolulate rarely confluent, the petiolules
5-15 cm long, rarely sessile; median leaflet elliptic to elliptic-ovate
or oblong-elliptic, acuminate at the apex, obtuse to acute and attenuate
at the base, 17-30 cm long, 5-11 cm wide, the primary lateral veins
4-5(-9) per side, weakly sunken, arising at an angle of (65-)70-80°(-90°),
weakly curved to the collective vein, the tertiary veins distinct,
the primary collective vein 2-6 mm from the margin, generally more
or less straight, the margins sometimes finely undulate; lateral leaflets
acute to narrowly rounded at the apex, slightly shorter than the median
leaflet, the inner margin cuneate-acute, the outer margin prominently
auriculate, the auricles acute to narrowly rounded at the apex, rarely
broadly rounded with the auricles overlapping on the blade whose leaflets
are not fully free, the primary lateral veins arising at a generally
sharper angle than those of the median leaflets (ca. 50-60°).
Inflorescences solitary; peduncles gray glaucous, 5-7
cm long, 6-9 mm diam. at an-thesis, soon recurved; spathe 11-15.5
cm long; spathe tube narrowly oblong-ovoid, 5.5-7.2 cm long, 1.5-3.5
cm diam., not markedly constricted below the blade, semiglossy, light
green on the outside, paler green within; spathe blade boat shaped
when open, obtuse at the apex, cream colored on the outside, creamy
white within, weakly tinged with pink toward the base; spadix sessile,
11 cm long, ca. 3 cm shorter than the spathe; pistillate portion of
the spadix 1.6 cm long, 1.5 cm diam. (7 mm on drying); staminate portion
of the spadix 8.5 cm long (dried), the sterile staminate portion 1.2-2.5
cm long, constricted weakly beneath the fertile part of the spadix.
Infructescences pendent, 8-9 cm long, 2.5 cm diam. (dried);
syncarp ovoid-elliptic, only slightly shorter than the fruiting spathe.
Figs. 33, 34.
DISTRIBUTION: Syngonium atrovirens is known for certain
only from Venezuela and has been collected at elevations of 50-500
m in the states of Apure, Tachira, Merida, and Zulia. A sterile collection
by Andre (419) from the Mag-dalena River Valley of Colombia (Naranjo-Carare)
is probably also this species.
The species is closely related to S.
yurimaguense from the upper Amazonian forests of Peru and
Bolivia but differs from that species by its inflorescence which is
much less constricted above the spathe tube. Both species have in
common very similar leaves which have the primary lateral veins of
the median leaflet arising from the midrib at almost a 90° angle.
VENEZUELA: APURE: East ofCeiba, Steyermark et al.
101942 (MY, VEN); SE ofCaserio San Camilo, Steyermark et al. 101478
(VEN). MERIDA: SE of El Vigia and El Quince, Bunting 2404A (MO, MY,
VEN). TACHIRA: La Fria-La Grita at Las Pavas, Bunting 2494 (MY, VEN).
ZULIA: S of Concha, Bunting 2776 (MY, VEN); Sierra de Perija, Steyermark
& Fernanda 99633 (NY, US, VEN).