330 A. A. HAMILTON. 



associated with the Blue-berry, Elceocarpus reticulatus 

 Sm., both species displaying a preference for the shelter of 

 the gully and the proximity of the watercourse. The 

 association is maintained throughout their geographical 

 distribution which is centred in New South Wales, extend- 

 ing northerly into Queensland and southerly to Victoria, 

 both species also reaching a considerable altitude at various 

 points on the dividing range. 



Several plants of Casuarina suberosa, are scattered along 

 the watercourse intermixed with the larger shrubs. The 

 characters usually relied upon to separate this species from 

 its congener 0. distyla, are, its erect habit, slender 

 branchlets, and truncated cones. The two first mentioned 

 characters are largely dependent upon ecological conditions. 

 When growing individually, as noted above, the plants of 

 C. suberosa have the spreading habit and coarse branchlets 

 of C. distyla, but when assembled in a close coppice form- 

 ation (its usual habit) the growth necessarily becomes 

 erect. In such an assembly growing in a swampy flat in 

 the Centennial Park, the branchlets are typically slender. 

 The truncated cone of Casuarina suberosa is not infre- 

 quently simulated by that of C. distyla. 



On the hillside rising from the gully to the ocean escarp- 

 ment, the open sandstone vegetation includes examples of 

 a broad leaved form of Hakea dactyloides Oav.; the 

 indifferently named Styphelia triflora Andr. — it is the 

 exception rather than the rule that the flowers are in 

 clusters of three; and the fascicled leaved . xerophyte 

 Darwinia fascicularis Rudge. 



Kunzea corifolia Reichb., which on the shale flats in the 

 Oabramatta-Bankstown district forms associations several 

 acres in extent, is unable on this sandstone hillside to 

 maintain a large colony, and is occasionally represented by 

 a group of two or three plants. Climatically it is a cool 



