BY R. H. CAMBAGE. 571 



which appeared to have affinities with E. eiK/cuioule^ and /:'. 

 Muelleriana: and, from the incomplete material obtainable, 

 ni.iy hv E. \\'dkinso?iiana R. T. Baker. The few fruits pro- 

 cured have red rims. 



Persoonia linearis, a Geebung, is distributed throughout 

 this country, and around Colong is regarded as good sheep- 

 fodder in times of drought. I', saliriua is also considered 

 fairly valuable for the same purpose. 



Colong to Mount Werong. 



Colong is situated at five miles south-westerly from Yerranderie, 

 at an altitude of about 2,000 feet; and Mount Werong is a further 

 distance of nearly 25 miles in a general westerly and north- 

 westerly direction, the bridle-track ascending to a plateau about 

 3,900 feet above sea-level. The route followed was throusrh 

 Barrallier's Pass, soutli of Colong Mountain,(3,436 feet) and Bin- 

 dook Swamp, to a narrow spur, which divides the waters of the 

 Wollondilly (Gulf Creek) on the south from those of the Kow- 

 raung on the north, the deep gorge of the latter sometimes coming 

 into view, 2,000 feet below. The last few miles are practically 

 level, and this locality is the home of many of our cold-region 

 plants, amongst others of interest found there being a new species 

 of Zieria. 



In addition to the felsite, Permo-Carboniferous sandstone, 

 Silurian slate, and granite passed, in the order named, a belt of 

 limestone crosses under the Silurian slate, but is exposed, on both 

 sides of the range, in Gulf and Lannigan's creeks, where con- 

 .siderable denudation has taken place. Its effect on the flora is 

 at once apparent, more particularly at the lower levels, owing to 

 the presence of Sterculia diversifolia (Currajong), which always 

 shows a preference for limestone-soils. 



As many of the plants around Yerranderie and Colong favour 

 the sandstone rather than the felsitic area, the following rock- 

 analysis, taken from the Mines Department's Annual Report, 

 1909, will be of interest. It may be mentioned that, from an 

 cecological standpoint, a rock containing less than 70% silica is 

 not considered remarkably acid. 



49 



