NOTES AND EXHIBITS. 419 



broad. No.2, from a dry claypan; Cook's River (A. A. Hamilton; 

 August, 1914); leaves similar in shape and size to those of No.l, 

 but distributed over a greater extent of the stem and branches, 

 and distant. No. 3, from a dry, elevated plateau in open forest- 

 country, comparatively sheltered; Leura (A. A. Hamilton; April, 

 1914); plants diminutive in size (3 J to 5 inches high) and much 

 branched; leaves heterophyllous; the narrow-linear form favor- 

 ing the upper, and the ovate form the lower portion of the stem 

 and branches, all under J inch long. No.4, from a dry sandhill, 

 Maroubra Bay (A. A. Hamilton; August, 1914); lower leaves 

 rotundate, :f to | inch long, gradually narrowing upwards on 

 the stem (shrub 1 foot high). No. 5, a bush of from 4-5 feet, 

 from a sheltered gully on the bank of a watercourse; Waterfall 

 (A. A. Hamilton; June, 1914); leaves heterophyllous, from 

 rotundate and 1 inch long, to narrow-linear and 2 lines long; in 

 some specimens, the rotundate leaves occupy the whole branch; 

 in others, both forms are present on the same specimen. It is 

 notable that the stems of the broad-leaved specimens are flat- 

 tened; as this form of leaf becomes deciduous under dry con- 

 ditions, the flattened stems are called upon to replace them, and 

 perform their functions until the climatic conditions are favour- 

 able to a renewal of leaf-growth. — Isopogon anethifolius R.Br., 

 (Maroubra Bay; A. A. Hamilton; August, 1914), exhibiting leaf- 

 variation. The series of leaves exhibited comprised various 

 stages of division, from simple to pinnatisect. 



Also, for Mr. J. H. Maiden, on behalf of Mr. T. Steel, a sup- 

 posed hybrid, Boronia florihunda Sieb., x B. serrulata Sm., from 

 French's Forest (These Proceedings, 1906, p. 566). Another 

 example of this plant was received at the National Herbarium, 

 from Dee why (T. D. Mutch; 24/8/1915), which presented further 

 evidence of hybridism. In habit and leaf-characters, the speci- 

 mens from French's Forest resemble those of B. serrulata. The 

 examples from Deewhy, both in habit and foliage, are rather 

 those of B. florihunda, though the colour of the flowers ap- 

 proaches that of B. serrulata. Opposite leaves are characteristic 

 of the Family (Rutaceae), but, in this example, all the leaves on 

 one of the branches are in whorls of three. 



