BY A. A. HAMILTO^f. 157 



CRUCIFER.E. 



The flaccid leaves, ranging fiora simple to lyrate, and pinna- 

 tifid, of many Cruciferous plants, are generically similar, and 

 frequently indistinguishable. 



VlOLARIE^. 



Leaf-divergence in lonidinm filifoi'me F.v M., due to environ- 

 mental conditions, was noted, and specimens from the Blue 

 Mountains exhibited before this Society (12; p. 392) showing, 

 under hygrophvtic conditions, a flaccid, elongated leaf '2\ inches 

 long; while, on examples from an elevated, dry ridge, the longest 

 leaf found measured barely | inch. 



PoRTULACEiE. 



Mr. A. H. S. Lucas brought living plants of Claytonia ans- 

 tralasica Hk., from Mt. Kosciusko to Sydney, and found that 

 the new shoots became perfectly glabrous, the glaucousness of 

 the plant also disappearing, with the vestiture, under cultivation 

 in a warmer climate(16; P-22). 



RuTACEjE. 



Exceptional heterophylly in Zieria involucrata R.Br., was 

 demonstrated in a series of specimens from Valley Heights, ex- 

 hibited before this Society(12; p.393). Mr. J. Stirling, F L.S., 

 (24; p. 1052) remarks of Zieria Smithii Andr., var. macrophylla, 

 " in specimens of this arborescent form, procured at different 

 altitudes and situations as regards humidity, dryness, &c., differ- 

 ences in the leaves represented by thickness, and (in the sub- 

 alpine vars. ) in having a dense, stellate tomentum on the under- 

 side." Again, under Hoi-onia anemoiiifolia, A. Cunn.,(/.c*., p. 1054) 

 " the division of the leaves into pinnse in some forms, and the 

 pubescence of others, are not constant characters." Mr. Stirling 

 also refers to leaf-variation in other Rutaceous plants, arising 

 from differences in soil, climate, and elevation. The Blue 

 Mountain representative of B. polj/ffalifolia Sm., var. robusta 

 Benth., is a xerophytic form of />. anemonifoUa A. Cunn., the 

 leaflets in the latter showing a gradual change as the plants 

 attain a more luxuriant station(13; 1914, p. 648). The hetero- 



