1960] 



SPATHIPHYLLUM 



11 



S. Spathe 4-6 times as long as wide ; stipe of the spadix ca. 0.5 cm long. 



Panama, Andean Colombia. 15. S. fulvovirens. 



SS. Spathe 3-4 times as long as wide; stipe of the spadix to 1.5 cm long. 



Eastern side of Andes in Peru. 16. 8. juninense. 



QQ. Leaf -blade 4-8 times as long as wide; angle of the primary lateral veins 

 various; or the blade wider with the primary laterals arising at an angle 

 of 25-45° (except in S. tenerum). 

 T. The locules of the ovary 2-1-ovulate, totaling 6-4 ovules per ovary. 

 U. Primary lateral veins arising at an angle of 45° or less. 



V. Blade of the leaf 4-5 times as long as wide ; primary lateral veins 



arising at an angle of ca. 45°. Cultivated. 17. S. patinii. 



W. Blade of the leaf 7-8 times as long as wide, primary lateral veins 

 arising at an angle of ca. 25°. Cerro Sipapo, Venezuela. 



18. S. sipapoanum. 

 UU. Primary lateral veins arising at an angle of 60-65°. Amazonian Peru. 



19. S. tenerum. 



■ TT. The locules of the ovary uniovulate, totaling 3-2 ovules per ovary. 



W. Plant ca. 2 dm tall; leaf -blade ca. 4 times as long as wide. Peru. 



20. S. minor. 



WW. Plant 3-4 dm tall ; leaf-blade 6-7 times as long as wide. 



X. Primary lateral veins arising at an angle of 30-40°. Peru. 21. S. gracilis. 

 XX. Primary lateral veins arising at an angle of 75-80°. Ecuador. 



22. S. patulinervum. 



EE. Pistil 1.5-2 times as long as the perianth, the style ± oblong, apically blunt and 



shortly narrowed into a brush-like stigma, sect. 3. Dysspathiphyllum. 23. S. humboldtii. 

 AA. Spathe conspicuously decurrent upon the peduncle for 2-10 cm ; style usually 



attenuate or conic and exceeding the perianth. sect. 4. Spathiphyllum, 



Y. Ovules mostly 8-6 per locule ; exserted portion of the style 3 or more times as long 

 as the perianth; base of the leaf-blade cuneate-aeute. Nicaragua to Panama and 

 Pacific-coastal Colombia. 24. S. friedrichsthalii. 



YY. Ovules 5-1 per locule ; exserted portion of the style not more than twice as long 

 as the perianth; base of the leaf -blade various; or the exserted portion of the style 

 3 times as long as the perianth, the base of the leaf-blade obtuse. 

 Z. Base of the leaf -blade broadly obtuse to subcordate; some locules of the ovary 

 5-4-ovulate; style attenuate or conic, 

 a. Geniculum 2.5-5 cm long. 



b. Leaf-blade mostly 50-65 cm long. Gulf -costal Mexico. 25. S. cochlear ispatli inn, 



bb. Leaf-blade mostly 35-45 cm long. Pacific Mexico, Guatemala, El Salvador. 



26. S. matudae. 



aa. Geniculum 2 cm long. Southern Colombia. 27. S. grandifolium. 



ZZ. Base of the leaf-blade acute, or if obtuse, all locules of the ovary 2-1-ovulate or 

 the pistil apically subtruncate. 

 c. Leaf -blade lanceolate, 3.5-4.5 times as long as wide; petiole slender, never alate 



in upper portion. Much cultivated. 28. S. wallisii. 



cc. Leaf-blade various, mostly 2-3 times as long as wide; petiole stout, often alate 

 nearly to the geniculum. 

 d. Base of the leaf -blade decurrent and forming a wing on the geniculum. 



e. Apex of the perianth segments fimbriate and/or deeply notched. Costa 



Rica. 29. S. wendlandii. 



ee. Apex of the perianth segments entire, erect and forming a collar around 



the style. Mexico. 30. S. ortgiesii. 



dd. Base of the leaf -blade non-decurrent ; geniculum not alate. 



f. Pistil subtruncate, constricted between the annular style and the ovary. 



g. Base of the spathe decurrent on the peduncle 5.5-10 cm. Costa Rica. 



31. S. atrovirens. 



gg. Base of the spathe decurrent on the peduncle 2.5-4.5 cm. Mexico. 



32. S. brevirostre. 



f f . Pistil not truncate, the style attenuate or conic. 



h. Base of the leaf-blade acute. 



