Monographs Details: Malanea sipapoensis Steyerm.
Authority: Maguire, Bassett. 1965. The Botany of the Guayana Highland. Mem. New York Bot. Gard. 12 (3): 1-285.
Family:Rubiaceae
Description:Latin Diagnosis - Planta ligneosa volubilis, stipulis ovatis acuminatis vel subcaudatis 8-13 mm longis 6-6.5 mm latis infra medium basique dense strigillosis aliter glabris, marginibusciliatis; foliis petiolatis, petiolis 15-40 mm longis sparse breviterque strigillosis vel glabratis; laminis late elliptico-ovatis vel oblongo-ellipticis apice abrupte acuminatis basi aeutis vel subacutis 12.5-16 cm longis 6.5-9.5 cm latis, supra glabris vel pilis panels remotis hirsutulis conspersis costa media nervis lateralibus breviter strigillosis impressis, subtus moderate adpresso-pilosulis costa media nervis lateralibusque breviter adpresso-strigillosis, marginibus ciliatis planis non revolutis; nervis lateralibus utroque latere 8-10; inflorescentiis 5-9.5 cm longis 1-3.2 mm longe pedunculatis, rhaehidi dense cinereo-strigillosa, ramis paucifloris infimis 2-6 mm longis ceteris sessilibus; bracteis flores subtendentibus ovatis extus hirsutulis ciliatis; calyce hypanthioque profunde campanulato, calyce 0.8 mm longo, lobis late suborbiculari-ovatis apice late rotundatis 0.3 mm longis extus prope apicem sparse vel moderate strigillosis ciliolatis; corollis non visis; fructibus 10-11 mm longis 4 mm latis.

Discussion:This species is distinguished by the ciliate leaf-margins and the ciliate stipules. It simulates 31. macrophylla, but has acuminate to subcaudate stipules. It also resembles M. gabrielensis, but the leaf-blades are longer and broader, longerpetiolate, and the lateral leaf nerves above are impressed, not sulcate.