Monographs Details: Spathiphyllum gracilis Bunting
Authority: Bunting, George S. 1960. A revision of Spathiphyllum (Araceae). Mem. New York Bot. Gard. 10: 1-54.
Family:Araceae
Description:Latin Diagnosis - Foliorum lamina obliqua, anguste oblongo-elliptica, 18-21 cm longa et 2.8-3.3 cm lata, ad apicem attenuata, ad basim acuta, ad marginem leviter undulata, venis primariis ca. 7-8-jugatis angulo ca. 30-40° divergentibus; petiolus gracilis, 26-32 cm longus, ad dimidium vaginatus; geniculum 0.6-0.8 cm longum. Pedunculus 29-34 cm longus; spatha ± lanceolata, 8-11 cm longa et 1.3-1.6 cm lata, apice attenuate, basi acuto vel attenuato et breviter ansato; spadix ad 2.7 cm longus, stipite ca. 1 cm longo, latitudine duos flores aequans; flores bimeri, perianthii segmenta separata; pistillum cylindrico-obpyramidale, apice subtruncato vel obtuso-subconico, stigmate elato; ovarium 2-locnlare, loculis uniovulatis, ovula solitaria oblonga in septo centrali prope basim locularem affixis; fructus ignotus.

Discussion:

Figure 6

Type collection: G. Tessmann 4837, "Ost-Peru: Stromgebiet des Maraiion am Pongo de Manseriche, ca. 77°:30' West." 1924 (holotype G-DBL, isotype NY). known only from the type collection. The typewritten label on the isotvpe sheet states "Puerto Melendez. below Pongo de jManseriehe" as the collection locality.

S. gracilis is closely allied to S. patulinervum, but differs in (1) the narrower angle at which the primary lateral veins arise, and (2) the acute-cuneate base of the leaf-blade. The base of the blade of S. patulinervum is nearly obtuse and the margins are curved.