316 A. A. HAMILTON. 



Two species which range from Queensland to Victoria 

 are the spreading, flexible stemmed Sccevola hispida Oav. 

 and the very common — in the Port Jackson district — 

 Dodoncea triquetra Wendl., the latter responding very 

 quickly to exposure by reducing the size of its leaves. The 

 typical Xanthosia pilosa Rudge, with a heavy grey vestiture 

 on the underside of its leaves, frequents the rocky hillside, 

 the form with a brown foliar tomentum remaining further 

 inland. Two Acacias are occasional on the headland, the 

 pinnate-leaved A. discolor Willd., and the "Coast Golden 

 Wattle," A. longifolia Willd. The latter is more frequent 

 on the dune where it is prominent on the frontal slopes, 

 but A. discolor favours the rocky hillside, and though 

 occasional on the inland sandhills does not closely approach 

 the beach on the dune. 



The headland at its southern end descends abruptly to 

 the strand with a bank of sand at its base sloping to the 

 entrance of Manly Lagoon. Much of the hillside vegeta- 

 tion is continued on the sand-bank, the "Coast Rosemary," 

 creeping along its crest some 300 yards inland. At the 

 base of the slope on the banks of the lagoon entrance 

 channel, a semi-aquatic creeper introduced from America, 

 Hydrocotyle umbellata L.,var. bonariensis Spreng., forms an 

 underground network of stems, and carpets the surface 

 with its large orbicular peltate leaves, which lie closely 

 appressed to the sand on the moist verge of the channel, 

 or are raised on their long petioles when growing in a lawn 

 of Zoysia on the dune slope. Though it flourishes best 

 near the water, it will creep up a dry steep sandy embank- 

 ment to a considerable height. This alien was first dis- 

 covered by the writer in 1902, on Freshwater Beach. 1 Its 

 range as now known extends northerly to Newcastle, and 

 as far south as Thirroul where it was recently collected by 



1 Proc Linn. Soc. N.S. Wales, xxnr, p. 906. 



