34 LEAVES OF LIKIODENDRON HOLM. 



these Magnolia-\ike leaves would certaiuly be very difficult or perhaps 

 even impossible, and 1 do not think it too hazardous to suggest that 

 some of these leaves have already beeu discovered, but identified aud 

 described as Mmjiiolia or possibly referred to other geuera. 

 U. IS. National Museum, November, 1889. 



EXPLANATION OF PLATES. 



Uriodcndron Talipifcra L. 



Plate IV. 



Fig. 1. A cotyledou, four times uatural size, rotluced one-third. 



2. A typical leaf of an old tree, two-thirds natural size. 



3. A typical leaf of the same tree, two-thirds natural size. 



4. A typical leaf of the same tree, two-thirds uatural size. 



Plate V. 



(All natural size.) 



Fig. 5. Leaf of a plant, five mouths old ; No. 1 after the cotyledons. 

 0. Leaf of a plant, iive months old ; the youngest one. 



7. Leaf of a plaut, live months old ; No. 3 after the cotyledons. 



8. Leaf of a plaut, five mouths old ; No. 1 after the cotyledons. 



9. Leaf of a plant, five months old ; No. 3 after the cotyledons. 



10. Leaf of a plant, five months old ; No. 1 after the cotyledons. 



11. Leaf of a plant, five months old; No. 3 after the cotyledons. 



12. Leaf of a plant, iive mouths old ; No. 2 after the cotyledons. 



13. Leaf of a plant, five months old ; No. 4 after the cotyledons. 



14. Leaf of a plaut, five mouths old ; No. 4 after the cotyledons. 



15. Leaf of a plaut, five months old ; No. 2 after the cotyledons* 



16. Leaf of a plant, five months old ; No. 4 after the cotyledons. 



17. Leaf of a plant, five mouths old; No. 3 after the cotyledons. 



The leaves Figs. 7, 14, and 16 are from the same plant. 

 The leaves Figs. 10 and 11 are from the same plaut. 

 The leaves Figs. 12 and 17 are from the same plaut. 



Plate >' I. 



(All uatural size.) 



FlG. 18. Leaf of a plaut, five mouths old ; No. 4 after the cotyledons. 



19. Leaf of a plant, five months old ; No. 4 after the cotyledons. 



20. Leaf of a plaut, five mouths old ; No. 5 after the cotyledons. 



21. Leaf of a plaut, five mouths old ; No. 6 after the cotyledous. 



22. Leaf, the nest oldest one, of a branch from an old tree. 



23. Leaf, the next youngest, of a plaut, two years old. 



24. Leaf, the youngest one, of a branch from an old tree. 

 2B. Leaf, the next oldest one, of a branch from an old tree. 



The leaves Figs. 9 aud 18 are from the same plaut. 

 The leaves Figs. 15 and 19 are from the same plant. 

 The leaves Figs. 22, 24, aud 25 are from the same tree. 



