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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



4. Leaves bordered by 1 or 2 rows of cells twice as long as wide, set at a right 

 angle to the margin. 

 5. Leaf margin deeply crenulate. 



6. Leaves subquadrate, retuse, patent. 3. C. retusa. 



6. Leaves subrectangular, widely spreading. 2. C. cellulosa. 



5. Leaf margin only weakly crenulate or entire. 



6. Leaf cells with large trigones; plants brownish. 4. C. elliottii. 



6. Leaf cells thin-walled, without trigones; plants olive-green. 



5. C. caespitosa. 



4. Leaves bordered by mostly smaller quadrate cells, or cells wider than high, 

 or not conspicuously bordered. 

 S. Leaf margin coarsely crenulate. 



6. Leaves subquadrate, retuse, patent. 3. C. retusa. 



6. Leaves subrectangular, truncate or rounded. 6. C. crenulata. 



5. Leaf margin only weakly crenulate or entire. 



6. Cells of the underleaf similar to those of the leaf; underleaf shortly 

 cleft, the segments broad, rounded, the margin crenulate. 



11. C. nephroslipa. 



6. Cells of the underleaves elongate, often hyaline, different from the 

 leaf-cells. 



7. Underleaves with some teeth or spines at the apices. 



8. Teeth long, triangular or spinose. 8. C. parallelo gramma. 



8. Teeth very short, often only as cell projections. 12. C. fissistipula. 



7. Underleaves without teeth, the margins often crenulate from pro- 

 jecting cell walls. 



8. Leaves weakly bordered by somewhat smaller cells; cells with 



knot-like trigones. 7. C. venesuelana. 



8. Leaves not bordered; cell walls mostly uniformly thickened, the 



trigones very small. 9. C. cyclostipa. 



1. Underleaves bifid, with or without supplementary teeth or projections on the lateral 

 margins, or bisbifid (4-divided with the middle sinus deepest). 

 2. Underleaves bifid, with or without a broad tooth or projection on each side. 

 3. Underleaves bifid, without supplementary teeth. 



4. Leaves oblong, subrectangular, the apex broad, rounded. 



S. Underleaves divided to near the base, the segments narrowly ovate, di- 

 vergent. 19. C. tenax. 

 5. Underleaves divided to the middle or less, the segments broad, rounded, 



erect. 11. C. nephroslipa. 



4. Leaves ovate, the apices acute or shortly bifid. 

 5. Leaf apices acute or mucronate. 



6. Underleaves scarcely broader than the stem. 



7. Leaves strongly asymmetric, the dorsal side short. 21. C. rhombifolia 



var. colombica. 



7. Leaves symmetric. 



8. Leaves mucronate. 17. C. andicola. 



8. Leaves blunt-ovate. 16. C. subintegra. 



6. Underleaves to 3 times as broad as the stem. 15. C. grandistipula. 



5. Leaf apices shortly bifid. 



6. Leaves strongly asymmetric, subquadrate, the dorsal margin straight, 

 the ventral margin longer, convex. 



7. Leaves mostly bifid; cells of the dorsal margin and interior to SO fi 



long. 20. C. rhombifolia. 



7. Leaves mostly mucronate, occasionally bifid; cells of the dorsal 



margin and interior long narrow, to 117 fi long. 21. C. rhombifolia 



var. colombica. 



6. Leaves more or less symmetric, ovate. 



7. Leaves about half as long as broad; underleaves with a shallow, 



broad lunulate sinus and broad, rounded segments. 14. C. oblata. 



7. Leaves longer than broad. 



8. Cells of the underleaf segments long-rectangular; leaf cells 



smaller, hexagonal. 18. C. uncimdatula. 



