3. Syngonium oduberi Ray, Aroideana 3:128. 1980. TYPE: Costa Rica, Osa Peninsula, Corcovado National Park, Ray 4 (GH, holotype).

Juvenile plants with trailing stems; internodes 4-7 mm long, 3 mm wide; leaves much like those of the adult but smaller and narrower; petioles 4.5-5.5 cm long; blades 13-15 cm long, 3.5-4.5 cm wide. Adult plants with stems closely appressed to trees; internodes 1-2 cm long, ca. 6 mm wide; petioles 6-10 cm long, sheathed throughout except for the apical 0.5-1 cm, the sheath free-ending and apiculate at the apex, not extending beyond the base of the blade, the apical part flattened adaxially with a medial rib, the margins acute; blades simple, oblong-elliptic, gradually acuminate at the apex, slightly constricted above the posterior lobes (less so on juvenile blades), 14-23 cm long, 6-8 cm wide, the posterior lobes bluntly acute, 8-13 mm long; primary lateral veins 12-14 on each side, sunken above, raised beneath; tertiary veins prominent; latex not milky though slightly orange in mature stems. Infructescences pendent; peduncles 3.5 cm long; fruiting spadix 4 cm long, 2.5 cm diam. The flowering spadix has not been seen; a nearly mature fruit was collected in July. Figs. 13-14.

DISTRIBUTION: Syngonium oduberi has been collected only once, in wet forest, at ca. 100 m elevation.

The species is distinguished by its oblong-elliptic leaves and almost fully sheathed petioles. It is most closely related to S. llanoense from the isthmus of Panama. It is distinguished from that species in having smaller leaves and stems, in having the posterior lobes bluntly acute (versus rounded in S. llanoense) and in having the sheath end well below the blade. In S. llanoense the sheath generally extends beyond the base of the blade.

COSTA Rica: PUNTARENAS: Parque Corcovado, Osa Peninsula, near Llorana, 100 m, Ray 4 (GH).