Juglans 255 



Carriere states that this tree arose from a cross between J. regia and J. nigra. 

 The leaves are identical with those oi J. Vilmoriniana. The young shoots differ in 

 having a glandular pubescence. The fruits are long-stalked and pear-shaped, but 

 otherwise closely resemble those of /. nigra. Young trees of this kind are in cultiva- 

 tion at Kew. 



3. Other hybrids between these species have been described. One mentioned 

 by Sargent was an immense tree, found in 1888 by Prof Rothrock on the Rowe 

 Farm on the north bank of the Lower James River, Virginia. It is described as 

 having the habit, foliage, and general appearance of y. regia, but producing a nut 

 not unlike that of the black walnut, though longer and less deeply sculptured. The 

 nut is exactly like that of Juglans regia gibbosa, Carriere,' which was raised by a 

 nurseryman at Fontenay-aux- Roses in 1848. 



De Candolle also described,^ zs Juglans regia intermedia, a tree which was found 

 at the Trianon, and supposed to be a cross between the common and black walnuts. 

 M. C. de Candolle informed Elwes that a similar hybrid exists at Geneva, and that 

 its seedlings have characters intermediate between the two parents. 



There are specimens at Kew, which were sent by Mr. E. Lyon in 1901 from 

 Hurley, Marlow, where there is a fine old tree o{ Juglans nigra, from the seed of 

 which plants were raised, which are apparently intermediate between that species and 

 the common walnut. 



H. Juglans regia x cinerea. Juglans alata, Carriere,' Rev. Hort. 1865, p. 447. 

 This is described as having young shoots pubescent : leaflets seven to nine, with 

 the end leaflet stalked, the others subsessile ; all oval or elliptic-lanceolate, abruptly 

 acuminate, obscurely and remotely serrate, pubescent on both surfaces : rachis 

 shortly pubescent. Three trees, presumably of this hybrid, have been observed 

 near Boston in the United States ; and a description and figure of them are given in 

 Garden and Forest, 1894, p. 435, fig. 69. 



III. Juglans regia Y. calif ornica. A remarkable hybrid between the common 

 walnut and the Californian wild species, has been obtained by Luther Burbank, who 

 names it "paradox."* 



Distribution 



The common walnut has a very wide distribution, occurring wild in Europe in 

 Greece, Bosnia, Servia, Herzegovina, Albania, and Bulgaria ; and extending eastward 

 through Asia Minor, the Caucasus, Persia, and the Himalayas to Burma and North 

 China and Japan. Its occurrence as an indigenous plant in Greece was first demon- 

 strated by Heldreich,' who found it growing wild in .^tolia at Korax, in Phthiotis on 

 the CEta and Kukkos mountains, and in Eurytania on Veluchi, Chelidoni, etc. It 

 grows wild in Greece in mixture with oaks and chestnuts in great quantity, especially 



' Rev. Hort. i860, p. 99, figs. 21-23, and 1861, p. 428, figs. 101-103. Rehder considers this hybrid to be the same as 

 J. Vilmoriniana. 



* Ann. Sc. Nat. Sir. iv. xviii. t. 4. 



' This is probably the same as Juglans intermedia quadrangulata, Carrifere, Rev. Hort, 1870, p. 493, figs. 66-68. 



Garden and Forest, 1894, P- 436. ' Verhand. Bo/. Vereins Prov. Brandenburg, 150(1879). 



