164 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Rosa corymbulosa {Boi. Mag. tab. 8566). — China. Nat. Ord. Rosaceae, tribe 

 Roseae. Shrub, erect or scandent, 3-6 feet high. Flowers 1 inch diameter. 

 Petals rose-coloured, with white base. Fruit globose. — G. H. 



Rosa setipoda (Bot. Mag. tab. 8569). — China. Nat. Ord. Rosaceae, tribe 

 Roseae. Shrub, 6-10 feet high. Flowers showy, 2 inches across. Petals wide, 

 pale rose, with a whitish base. — G. H. 



Roses, Hybrid Austrian Briars. By G. M. Taylor (Gard. Chron. Jan. 23, 

 1915, p. 37). — Two Continental raisers obtained hybrids in the closing years of 

 last century, viz. M. Pernet-Ducher and Dr. Midler. Descriptions are given of 

 15 later varieties of Austrian Briar parentage. — E. A. B. 



Rubus Giraldianus. By W. J. Bean (Kew Bull. 1914, p. 52 ; plate). — 

 A fine white-stemmed blackberry with graceful arching stems. (See Journal 

 R.H.S. xl. p. 217.) — F. J. C. 



Rust of Oak and Pine. By G. G. Hedgcock and W. H. Long (Jour. Agr. 

 Research, ii. pp. 247-249 ; figs.). — The authors have compared the fungus 

 hitherto known as Cronartium Quercus in America with the European species 

 of that name, and conclude it to be different, proposing the new combination 

 C. cerebrum for it. Infection of various species of Pinus with it shows that 

 its effects on different hosts are not all alike. On Pinus contorta, P. edulis, 

 P. densiflora, P. divaricata, and P. virginiana spheroid swellings are generally 

 produced ; on P. Coulteri, P. ponderosa, P. radiala, and P. Sabiniana fusiform 

 swellings (which, with other facts, suggests that Peridermium fusiforme may be 

 identical with this) . In nature spheroid galls are usually found on P. divaricata, 

 P. clausa, P. echinata, P. glabra, P. resinosa, and P. virginiana, and the fusiform 

 on P. serotina and P. Taeda. On P. Taeda the galls are often accompanied by 

 witches' brooms. The uredospores were produced on Quercus nigra, Q. velutina, 

 Q. californica, Q. digitata, Q, Gambelii, Q. imbricaria, Q. lobata, Q. Michauxii, 

 Q. Phellos, Q. rubra, Q. alba, Q. bicolor, Q. Emoryi, and Castanopsis chrysophylla. 

 (See also Journal R.H.S. xl. p. 619.)—^. /• C. 



Saltpetre for Destroying Trees (Queensland Agr. Jour. p. 72; Jan. 1914). — 

 Where it is desired to destroy a tree without cutting it down, a hole is bored in 

 the tree in a downward direction to the centre. For large trees, a 1 inch auger is 

 used; for smaller ones, £ inch size is large enough. For large trees, 1 oz. to 2 oz. 

 of ordinary commercial saltpetre (nitrate of potash) is used, and for smaller ones 

 \ oz. to 1 oz. A plug is put in the hole to keep rain from washing it out. The 

 nitrate of potash is carried by the sap to the tips of the branches and to the 

 rootlets. If the tree is a large one, say 2 feet or more in diameter, very little 

 difference will be noticed in the foliage for two or three months, then the leaves 

 begin to fall, and it assumes a bare, wintry appearance. At the end of about six 

 or eight months a little brushwood is piled round the tree and lit ; it will smoulder 

 away to the remote ends of the roots, sometimes 30 feet from the butt of the tree, 

 leaving masses of valuable ash ; the tree will fall, and when fallen it will con- 

 tinue to smoulder until every particle is converted into ash. — C. H. H. 



Salvia longistyla (Bot. Mag. tab. 8590). — Mexico. Nat. Ord. Labiatae, tribe 

 Monardeae. Herb, up to 15 feet in height. Leaves 3-5^ inches long. Raceme 

 often 15 inches up to 25 inches long. Flowers with corollas 1^ inch long, 

 scarlet. — G. H. 



Sand Dunes at Culbin, The Planting of. By P. Leslie, M.A., B.Sc. (Trans. Roy. 

 Scot. Arbor. Soc. vol. xxix. pt. 1, pp. 19-28 ; January 1915). — One of the most 

 striking illustrations that we possess in this country of lands, otherwise use- 

 less, being reclaimed and made of economic value by means of afforestation, 

 is afforded by the experiments which have been carried out during the last 

 hundred years on the large stretches of sand known as the Maviston and 

 Culbin Sands, situated on the Morayshire and Nairnshire coasts, between 

 the rivers Nairn and Findhorn. 



The Culbin Sands proper cover an area four miles long by two miles broad. 

 Towards the north they are covered with sand piled up into ranges of hills and 

 valleys in seemingly endless succession. From the top of these hills, which 

 often exceed 200 feet in height, an excellent view is obtained of the surrounding 

 country, and of the far distant hills of Cromarty. In the valleys the old land 

 surface often comes to view. The furrows made by the plough two hundred 

 years ago are still visible. 



