MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[VOL. 11 



9. Margins of the lamina of the leaves and underleaves with one or 

 two teeth, the dorsal base cordate. 



9. L. Ivirligiana. 



9. Margins of the lamina of leaves and underleaves without teeth, 

 or with a 1-celled tooth on the underleaves; dorsal base of the 

 leaf straight or nearly so. 8. L. cacspitosa. 



8. Bases of the leaf segments mostly six to eight cells wide. 10. L. jamaicensis. 

 6. Leaves subquadrate or truncate-ovate. 

 7. Stem leaves very strongly concave to cucullate, the apices touching 

 the stem. 



8. Dorsal margin of the leaf strongly convex and extending across the 

 stem. 



9. Dorsal base of the leaf cordate to auriculate; margins of the 



leaves and underleaves with one to several teeth. 18. L. rnacrocolea. 

 9. Dorsal base of the leaf straight; margins of the leaves and under- 

 leaves essentially without teeth, (occasionally with a tooth on the 

 underleaf) ; leav es very obliquely quadrifid. 20. L. peruviensis. 



8. Dorsal margin of the leaf slightly convex from a straight base, the 



margins of the leaves and underleaves without teeth. 3. L. incurvata. 



7. Leaves concave, never cucullate, the apices more or less erect or 

 spreading, or if incurved, not touching the stem. 

 8. Many of the leaves and underleaves with five or six segments and 

 supplementary teeth and cilia, the margins of the lamina always 

 toothed. 19. L. armata. 



8. Leaves and underleaves quadrifid. 

 9. Margins of the lamina of the underleaves usually with a tooth on 



either side. 15. L. miinchiana. 



9. Margins of the leaves and underleaves without cilia or teeth. 

 10. Plants tiny, leaf segments often connivent; segments of the 



underleaves uniseriate. 4. L. portoricensis. 



10. Plants larger, the leaf segments ascending to spreading ; underleaf 



segments triangular from a 2-4-celIed base. 11. L. brcmlicnsis. 

 . Plants of medium to large size; stem with leaves, 1.0 mm or more broad. 

 4. Margins of the leaves and underleaves essentially without teeth (an occasional 

 tooth may sometimes be found on a leaf or underleaf). 

 5. Leaves strongly concave-cucullate to saccate, very obliquely truncate, the 



segments short, the tips often brownish. 20. L. peruviensis. 



5. Leaves plane to concave, the segments spreading to ascendent. 

 6. Leaf segments less than one-fourth the length of the lamina, segments 

 of the branch leaves often very short, blunt, with wide sinuses. 

 7. Segments and upper leaf margins without teeth. 12. L. coilophytta. 



7. Segments with scattered, obscure or few-celled teeth. 12a. var. apiculiloba . 

 6. Leaf segments long-triangular. 

 7. Leaf segments with a broad, mostly 6- to 8-celled base and ending in 

 an acute, 2-celled tip; underleaves squarrose, the triangular segments 

 curved and parallel to the stem. 

 8. Mouth of the perianth subentire. 13. L. cupressina. 



8. Mouth of the perianth ciliate, the cilia two to four cells long. 



14. L. pseud ocuprcssina. 

 7. Leaf segments ending in an accuminate, uniseriate, tip four to eight 

 cells long. 



8. Cell of the tip of the segment three or more times as long as wide. 



17. L. inaequalis. 



8. Cell at the tip of the segment at most twice as long as wide. 



16. L. wallisiana. 



4. Margins of the lamina of the leaves and/or underleaves (at least of the 

 branches), with few to many teeth. 

 5. Stem leaves plane to concave, never saccate. 

 6. Leaves and underleaves very often with five or six segments, often with 

 many supplementary teeth and cilia. 

 7. Segments of the leaves and underleaves regularly long-ciliate, with 



the cilia in three or four opposite rows. 24. L. pinnalicruris. 



