BULLETIN 231] WALNUT CULTURE IN CALIFORNIA. 169 



black walnut trees which do not coincide with any species known to the 

 writer. There is a tree, for instance, on the University grounds just 

 north of the creek in the rear of the old athletic field, which is of a 

 peculiar type. This is a tall, clean-trunked, vigorous tree, having much 

 of the appearance of a Eoyal hybrid and bearing a small smooth nut. 

 The origin of this tree could not be ascertained. On the south side of 

 Bancroft Way, just east of St. Mark's Episcopal Church, there is a row 

 of black walnut trees which seem peculiar to themselves in regard to 

 specific characteristics. There is another row of larger trees on the west 

 side of College avenue, about midway between Oakland and Berkeley, 

 in the Claremont district. All these street trees have a general resem- 

 blance to one another and look as though they might possibly be Royal 

 hybrids. The writer has never been able to obtain any nuts from them. 

 It is possible that they are all seedlings from some one tree. 



On the El Molino ranch, above mentioned, there may be found in the 

 canon above the ranch in the Oak Knoll property several most peculiar 

 trees. These vary in foliage and general appearance all the way from 

 that of the English walnut to that of nigra and calif ornica and bear 

 all sorts of peculiar nuts. Some are quite large, some extremely small 

 like those of rupestris, some rough, some smooth, some round, some 

 elongated and some almost square. Mr. Fred Gray, now superintend- 

 ent of the Leffingwell ranch near Whittier, who was formerly super- 

 intendent of the El Molino ranch, stated that he planted many of these 

 canon trees by taking nuts from the large Royal trees which we have 

 described and throwing them about broadcast among the bushes and 

 brush in the canon. There are also growing in this canon several trees 

 of Juglans calif ornica. There is a considerable number of old English 

 walnut trees on the ranch in the immediate vicinity of the black wal- 

 nuts and these peculiar trees therefore represent, presumably, a gen- 

 eral mixture of the three species, nigra, regia and calif ornica. 



One tree in this canon is especially peculiar. This has been called 

 the pecan-walnut tree, under the assumption that it might possibly be 

 a cross of the pecan with nigra, or the Royal hybrid. There are sev- 

 eral pecan trees growing close to the black walnut trees on the ranch, 

 so that opportunity exists for such a cross, if it were possible. The 

 tree mentioned stands on the east side of the canon near its opening, 

 and in its general characteristics might easily pass for such a cross. 

 The foliage resembles that of the pecan to a considerable extent; the 

 bark is fibrous, striated and very close-fitting and smooth like that of 

 the pecan; the wood has something of a pecan appearance, and the 

 nut is exactly intermediate in character between those of the pecan 

 and the eastern black walnut. The nuts are of an elongated oval form, 

 pointed on both ends and deeply grooved. The seedlings of this tree,. 



