146 ROBERT TRACY JACKSON ON 



Acer taktakkum var. ginnale. 



Fig. 33. The proximal pair of leaves entire, very slightly dentate, the next [lair with well developed lobes, compare 

 with leaves 2, Fig. 28. Jes.sn, Japan. Xi. Figures 30-33 from .specimens in herbarium of Arnold arboretum. P. 101. 

 Figs. 30-33 drawn by Mr. J. 11. Emertou ; others by the author. 



PLATE 18. 



Acer platanoides. 

 Fig. 34. Sucker from stump of adult, showing Irilobed leaves. Cultivated. X l- P. 100. 



Negundo aceroides. 



Fi". 35. Sucker from ba.se of adult with a simple, trilobed leaf fullnwed by a tritoliolate leaf (as leaves are opposite in 

 this species the mates of the two leaves figured must be considered ab.sejit from accident or repression). Cultivated. XV. 

 P. 102. 



Fig. 36. Typical leaf of adult. Cidtivated. Reduced. P. 102. 



Gtmnocladus disicus. 



Fio-. 37. Typical but small leaf of adult, twice pinnate distally, once pinnate proximally. Much reduced. P. 102 and 



140. 



Fig. 38. Sucker from root of same tree as Fig. 37, leaf once pinnate. Cultivated. Xj. P. 102. 



Gleditschia triacantuos. 



Fig. 30. Seedling shoning-the cotyledons which are oval, auricleil at the base embracing the stem, the nepionic leaves 

 are alternate, panpinnate, with many leaflets. Cultivated. Xl. P. 102. 



Fatsia japonica. 

 Fig. 40. Small but typical leaf of adult, palmately deeply cleft. Cultivated. X'(. P. 104. 



Fie. 41. Seedling showing obovate cotyledons, and nepionic leaves 1 ovate, 2 subcordate, 3 trilobed, all finely serrate. 

 Cultivated. X l- P. 104. 



Fig. 42. Sucker from the base of an adult raised from .seed, leaf 1 trilobed, 2 subcordate, both finely serrate. Compare 

 Fig. 41. Cultivated. XI. P. 104. 



Hedera helix. 



Fig. 43. Seedling showing cotyledons ovate, nepionic leaves alternate, 1, subcordate with a slight lobe on one side ; 2, 

 subcordate, nearly triangular ; 3, tivedobed ; 4 (younger), weakly trilobed ; .5, nearly triangular ; compare with leaf 2. Flor- 

 ence, Italy. Xl. P. 104. 



Fi" 44. Branch of adult vine, leaf 1, five-lobed ; 5 (younger), weakly five-lobed ; 6-8, broadly trilobed ; compare with 

 Fig. 43. Cultivated. Xj. P. 105. 



FrAXINUS AMERICANA. 



Fig. 45. Seedling showing cotyledons elongate, distally blunt, and lU'pionic leaves, simple, opposite, elongate-ovate, 

 petiolate. Xi P. 105. 



Fin-. 4(5. Tip of older seedling. First nepionic leaves (not shown) all simple, next leaves trifoliolate, lateral leaflets 

 sessile, terminal leaflet petiolulate. Xi. P. 106. 



Fi". 47. Sucker from ro(.)t near the base of an adult tree. First leaves alternate, simple, petiolate, oval, distally acumi- 

 nate, terminal leaves opposite, trifoliolate, lateral leaflets sessile, terminal leaflet petiolulate, all leaves except 1 serrate. 

 Compare Figs. 45-46. Xi- Figs. 45-47, Milton, Mass. P. 106. 



