170 THE INSTABILITY OP LEAF-MORPHOLOGY, 



{i; iv., p. 237) that specimens from Port Jackson (near the sea) 

 have large leaves, and others (summit of the Blue Mountains) 

 have smaller leaves. The latter statement must be qualified by 

 due regard for environmental conditions, as examples from the 

 higher elevations on the Blue Mountains, growing under different 

 conditions, also have large leaves, which approach in size and 

 shape those of E. obtusifolia Sm.(13, 1915, p. 721). Similar 

 environmental conditions were noted (13; 1914, p. 544) in the 

 case of E. reclinata A. Cunn., and a transition in the foliase 

 from flaccid and pilose to rigid and glabrous, was observed. 



MYRSINACEiE. 



Irregular, marginal toothing occurs in Myrsine variabilis 

 R.Br.; the presence of teeth on the young growth, and their 

 absence on the leaves of adult branches, have frequently been 

 noted. 



' OLEACEiE. 



The leaves of J^otelcea ovata R.Br., and those of N. hngifolia 

 Vent., approach each other, and are finally merged; leaves of the 

 latter, exhibiting extensive variation, were noted(l3; 1914,p.326). 

 In a footnote to N. longifolia, Bentham (i; iv., p.299) says, "The 

 northern and southern specimens belong almost entirely to the 

 glabrous form, the pubescent one is chiefly about Port Jackson, 

 and in the Blue Mountains, to New England, some of C. Stuart's 

 specimens from the latter station being densely and softly 

 pubescent all over." Venation, the leaf-character chiefly relied 

 upon by Bentham (4; iv., p. 300) to separate N. microcarpa R.Br., 

 N. lignstrina Vent., and iV. linearis Benth., is variable in each 

 of these species, occasionally on the same specimen; and all 

 three are beset with more or less conspicuous dots, a character 

 ascribed by Bentham to N. punctata R.Br., onl};- {l..c.). 



CONVOLVULACEiE. 



Specimens of Ipomiea Pes-Caprce Roth., (Stanwell Park; Aug., 

 1915; A. A. Hamilton) showing variation in the length of the 

 petiole of the leaves, in an individual plant, ranging from 1 inch 

 to 4 inches, is here noted. 



