LOCALIZED STAGES IN DEVELOPMENT. " I47 



Fig. 48. Typical leaf of adult, lateral and terminal leaflet.s petiolulate. Compare with Figs. 40, 47. Emerson (70), 

 reproduced by permission. Reduced. P. 106. 

 Figs. 34-48 drawn by the author. 



PLATE 19. 



Sassafras sassafras. 



Fig. 49. Seedling .showing fruit adherent, uepionic leaves alternate, elongate-oval. Leaf has .sliglit marginal depres- 

 sions. Sliady Hill nurseries, Bedford, Mass. xl. P. 107. 



Fig. 50. Tip of an older seedling, all proximal leaves (not sliown) oval, terminal leaves two- or three-lobed. West Chop, 

 Martha's Vineyard, Mass. X .i. P. 108. 



Fig. 51. Small but entire branchlet of adult, first ionr leaves entire, oval. Succeeding leaves tluve lolieil, compare Figs. 

 49-50. West Chop, Martha's Vineyard, Mas.s. Xi. P. 108. 



MVRICA CERIFERA. 



Fig. 52. Seedling .showing broad, spatliulate, di.stally emavginate cotyledons. Tlie first nepionic leaves are .spatliulate 

 tridentate, witliout petioles, in later nepionic leaves more dentations and petioles develop progressively. Xi- P. 113. 



Fig. 52a. Enlargement of cotyledons and first nepionic leaves. X 3. Arnold arboretum. P. 113. 



Fig. 53. Typical leaves of adidt, oval, petiolate, distally dentate. Compare with young leaves of Fig. 52. Cohasset, 

 Mass. Xl. P. 113. 



Platanus orientalis. 



Fig. 54. Seedling showing strap-shaped cotyledons, and nepionic leaves which are elongate, cuneate, distally tridentate. 

 In these leaves the blade extends to the base of the leaf, no petiole having developed. (Lubbock, '92.) Reproduced by tlie 

 courtesy of Messrs. D. Appleton & Co. Xl. P. 109. 



Platanus occidentalis. 



Fig. 55. Sucker from the base of an adult tree, leaves elongate, cuneate, distally dentate, blade extending nearly to tlie 

 base of the petiole. Compare with Fig. 54. Xl- P. 109. 



Fig. 50. Another sucker from the base of an adult tree. Leaves elongate, trifid to trilobed distally, blades extending far 

 down toward base of petiole. xJ. P. 109. ' 



Fig. 57. Typical leaf of adidt, five-lobed, marginally dentate, blade extends only a short distance down the petiole 

 forming an obtuse angle proximally. Xj. P. HO. 



Fig. 58. Vigorous leaf from the upper part of a sucker (several feet from the ground), five-Inlicd, highly dentate 

 marginally with a prominent basal lobe which stands out tree from the petiole. Fig 58a, so tliat the leaf is pertoliolate. XA. 

 P. 109. 



Fig. 58b. Stipules forming an encircling ruffle about the base of the petiole of leaf Fig. 58. X'- Figs. 55-58 all frcjni 

 one tree. Milton, Mass. P. 109. 



Figs. 52-53 drawn by Mr. J. H. Emerton ; others by the autlior. 



PLATE 20. 



HiconiA ovata. 



Fig. 59. Seedling .showing nut resting on the gi'ound (dotted line), nepionic leaves 1-3 simple, ovate. Leaf 4 abnormal 

 with one lateral leaflet. Leaves 5-0 trifoliolate. X'.- P. 110. 



