10 MEMOIRS' OF THE NEW YORK BOTANICAL GARDEN [VOL. 10 



Type species: Spathiphyllwm lanceaefolium (Jacq.) Schott, Melet. Bot. 1: 

 22. 1832. 



Key to the Sections and Species of Spathiphyllum 



A. Spathe usually non-decurrent on the peduncle; style various, never attenuate-conic. 



B. Perianth a 4-6-sided cup, the apex entire, truncate. sect. 1. Massowia. 



C. Blade of the leaf 1.5-3 times as long as wide; spathe mostly 3-4 times as long 

 as wide. 



D. Leaf-blade typically oblanceolate to narrow elliptic, 2.5-3 times as long as 

 wide; spathe 3-5 times as long as wide. South America, Trinidad. 



1. S. cannae folium. 



DD. Leaf -blade typically broad elliptic, 1.5-2.5 times as long as wide; spathe 



mostly 2.5-3 times as long as wide. Indonesia, Philippines. 2. S. commutation. 



CC. Blade of the leaf narrower, 3.5 times as long as wide; spathe more than 5 times 



as long as wide. Cocos Island. 3. S. laeve. 



BB. Perianth segments separate, at least apically. 



E. Pistil scarcely exceeding the perianth, the apex sub truncate. sect. 2. AmomophylVum. 

 F. Ovules 6-3 (-2) in each locule, totaling 14-6 ovules per ovary; if totaling 

 7-6, the primary lateral veins rising at an angle of 15-30° (to 45° in S. 

 cuspidatum, Tcalbreyeri) . 

 G. Plants 4 dm or more tall (sometimes shorter in S. quindiuense) . 

 H. Leaf -blade narrowly elliptic, 5-9 times as long as wide. 



J. Spathe pergameneous; stigma coronate, not conspicuous above the 



perianth. Colombia, Panama. 4. S. quindiuense. 



J J. Spathe chartaceous; stigma nipple-like, conspicuous above the perianth. 



Venezuela. 5. S. monachinoi. 



HH. Leaf-blade wider, 3-5 times as long as wide. 



K. Spathe to 10 cm long, 2-3 times as long as wide ; stipe of the spadix ca. 



0.5 cm long. Brazil. 6. S. gardneri. 



KK. Spathe to 20 cm long, 3-5.5 times as long as wide ; stipe of the 

 spadix 1-2.5 cm long. 

 L. The spathe lanceolate or elliptic, 3-5 times as long as wide. British 



Guiana. 7. S. cuspidatum. 



LL. The spathe oblong, 5-5.5 times as long as wide. Colombia. 



8. S. Tcalbreyeri. 



GG. Plants 3 dm or less tall. 



M. Ovules superposed, totaling 14-10 ovules per ovary. Peru, Colombia (?). 



9. S. lechlerianum. 



MM. Ovules collateral, affixed on a sub-basal pad in each locule, totaling 9-5 

 ovules per ovary. 



* N. Peduncle subequaling the petiole; leaf -blade 7-9 times as long as wide. 



West-central Venezuela. 10. S. jejunum. 



NN. Peduncle twice as long as the petiole; leaf -blade wider. 



O. Blade of the leaf lanceolate, the base short acute. British Guiana. 



11. S. maguirei. 



OO. Blade of the leaf elliptic, widest at the middle and equally attenuate 

 toward either end. 

 P. Spadix 3-4 times as long as the stipe; leaf -blade 6-8 times as long 



as wide. Mt. Roraima, Venezuela. 12. 5. schomburgTcii. 



PP. Spadix equaling to twice as long as the stipe; leaf -blade wider, 

 4.5-5.5 times *as long as wide. Cerro de la Neblina; Venezuela. 



13. S. neblinae. 



FF. Ovules (3-) 2-1 in each locule, totaling 7-2 ovules per ovary; if totaling 

 7-6, primary lateral veins arising at an angle of 45-75°. 

 Q. Leaf -blade 2-3 times as long as wide; primary lateral veins arising at an 

 angle of 60-75°. 



R. Petiole subequaling the leaf-blade. Colombia. 14. S. floribundum. 



RR. Petiole much longer than the leaf-blade. 



