Naturalisation in Extra-Tropical Countries. 435 



Pterocarya fraxinifolia, Kunth. 



From Central Asiatic Russia to Persia. A kind of Walnut-tree, 

 which with P. stenoptera (Gas. de Candolle) on Dr. Hance's 

 recommendation should be adopted as trees for both ornament and 

 timber, and so perhaps also the Japanese species, P. rhoifolia 

 (Siebold and Zuccarini). 



Pteropyrum Aucheri, Jaubert and Spach. 



Persia and Afghanistan. A desert-shrub, remarkable for the 

 brilliancy of its scarlet fruits. Used locally for fodder [Aitchison], 

 therefore perhaps deserving translocation to the deserts of Aus- 

 tralia and other parts of the globe. 



Ptilotus hemisteirus, F. v. Mueller. 



Desert-regions of Australia. On this herb sheep do particularly 

 well ; so on some other species, for instance P. alopecuroides, 

 of which Mr. H. Walsh writes that it is a splendid fodder-plant on 

 the Upper Murchison River, covering the country for hundreds of 

 miles. Horses and cattle are particularly fond of it. Mrs. Heal 

 also bears testimony as to its usefulness. Mr. Isaac Tyson mentions 

 further in this respect P. nobilis, P. helipteroides and P. obovatus, 

 especially as winter-plants of the arid pastures of sub-tropic West 

 Australia. Easily disseminated. 



Ptychosperma Alexandras, F. v. Mueller. 



The Alexandra -Pa 1m. Queensland, as well in tropical as extra- 

 tropical latitudes. The tallest of Australian palms, and one of the 

 noblest forms in the whole empire of vegetation. Aged it exceeds 

 100 feet in height, and is likely destined to grace many shady moist 

 groves yet outside the tropics, so long as they are free from frost, 

 as this palm seems less tender than most others. The demand for 

 seeds has already been enormous ; for long voyages they are best 

 packed fresh into the sawdust of resinous kinds of wood ; tinfoil 

 is a very suitable material for packing small lots of palm-seeds for 

 far distances to prevent desiccation. 



Ptychosperma Arfakiana, Beccari. 



New Guinea, reaching elevations of 5,000 feet in comparatively 

 temperate regions. Height as much as 30 feet. 



Ptychosperma Cunninghami, Hermann Wendland. 



East- Australia, as far south as Illawarra ; thus one of the most 

 southern of all palms. This also is a very high species, destined to 

 take a prominent position in decorative plantations even far beyond 

 the tropics. Several congeners occur in Fiji and other islands of 

 the Pacific Ocean, and others again might be obtained from India, 

 but they are probably not so hardy as those just mentioned. 



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