1916 J Babcock: Studies in Juglans, III 



75 



the immediate progeny. This is what would be expected if the 

 new variety has the same genetic relation to J. kindsii as quercina 

 has to J. calif ornica. 



In an earlier paper 3 I proposed to designate quercina as J. 

 calif ornica mut. quercina and the quercina-like form of hindsii 

 as /. calif ornica var. hindsii mut. quercina. However, the recog- 

 nition of hindsii as a species 4 simplifies the problem and makes it 

 desirable to describe the new mutant from hindsii as a variety of 

 that species and to retain quercina as a variety of calif ornica. 

 The following description is based upon material gathered from 

 several of the seedlings in Covell's nursery in 1914. The seven 

 seedlings growing on the campus of the University of California 

 are cited as cotypes. It should be noted that the variety name 

 has been chosen for the express purpose of emphasizing the fact 

 that the new variety resembles quercina in leaf characters. 



NEW VARIETY 

 Juglans hindsii var. quercinifolia Babcock 



Tree. Bark and leaves strongly walnut-scented. Pits in 

 plates. Twigs, bud scales, and young leaves granular pubescent. 

 Buds few-scaled axillary or superposed. Leaves 1 to 3 l / 2 inches 

 long, alternate, exstipulate, mostly compound with three leaflets ; 

 terminal leaflet 1% to 2 times as long as lateral leaflets and 

 ranging from % to 2!/4 inches in length, in form ovate or 

 elliptical, obtuse or truncate at the apex, margin irregularly 

 crenate or serrate; lateral leaflets mostly opposite and sessile, 

 sometimes one' or both lacking, occasionally one or two extra ones 

 present; petiole equal to or shorter than lateral leaflets; very 

 rarely with unifoliolate leaves. (Cf. plate 20, fig. 1.) 



Nursery of George F. Covell, Modesto, Cal., Nov., 1914, Univ. 

 of Calif. Herb. no. 189541. Cotypes on campus of the Univ. of 

 Calif. (Cf. Div. of Genetics nos. 7550 to 755#.) 



Plate 20, fig. 1 shows a specimen of quercinifolia which was 



supplied by Covell in 1915. A typical quercina seedling is shown 

 in plate 20, fig. 3. The relative size of these two seedlings is of 

 no significance as they were not of the same age. In order to 



s Babcock, E. B., Walnut Mutant Investigations, Proc. Nat. Acad., 

 vol. 1, p. 535, Oct., 1915. 



4 Jepson, W. L., in Smith, E. E., Univ. Calif. Agr. Exp. Sta. Bull. 203, 

 p. 27 (1909). Juglans calif ornica Wats. var. hindsii Jepson in Bull. So. 

 Cal. Acad. Sci., vol. 7, p. 23 (1908). 



