50 MISCELLANEOUS CIRCULAR 92, U. S. DEPT. OF AGRICULTURE 



NAMES IN USE 



Walnut (Minn.). 



Oil Nut (Me., Minn., N. H., S. C). 



Buttnut (N. J.). 



Lemon Walnut (lit.). 



American White Walnut (trade). 



Butternut (Me., N. H., Vt., Mass., 



R. I., Conn.. N. Y., N. J., Pa., Del., 



W. Va., N. C., S. C, Ala., Ark., Ky., 



Tenn., Mo., 111., Iowa, Ind., Mich., 



Minn., Wis., Kans., Nebr., Ohio, 



Ont.). 

 White Walnut (Del., Pa., Tenn., Va., 



W. Va., N. C, S. C., Ala., Ky., Mo.,* 



111., Ind., Wis., Iowa, Nebr., Minn., 



S. Dak.). 



X Juglans quadrangulata Rehder. Hybrid. 



Range. — Eastern Massachusetts. 



Note on nomenclature. — Believed to be a hybrid between Juglans regia and 

 Juglans cinerea Linnaeus (cult.). 



X Juglans sargentii Sudworth. 



Hybrid, 



Range. — Eastern United States (cult.). 



Note on nomenclature. — Believed to be a hybrid between Juglans cinerea 

 Linnaeus and Juglans sieboldiana Maximowitz. 



* Juglans nigra Linnaeus. 



Black Walnut. 



Range. — Southern Ontario to Florida, central Alabama, and Mississippi, and 

 westward through southern Michigan, Wisconsin, and Minnesota to central and 

 northern Nebraska, eastern Kansas, Arkansas, and Oaklahoma (Rich Mountain), 

 and eastern Texas (San Antonio Rver). 



NAMES IN USE 



Black Walnut (N. H., Vt., Mass., Walnut (N. Y., Del., W. Va., Fla., Ky. 



R. I., Conn., N. Y., N. J., Del., Pa., 

 Va., W. Va., N. C, Tenn., Ga., Fla., 

 Ala., Miss., Tex., La., Ark., Ky., 

 Mo., Ind., 111., Kans., Nebr., Iowa, 

 Mich., Ohio, Ont., S. Dak., Minn.). 

 American Black Walnut (trade). 



X Juglans intermedia Carriere. 



Range. — Eastern United States (cult.). A very large tree 

 (between Juglans nigra Linnaeus and Juglans regia Linnaeus) has been found in 

 southeastern Virginia (banks of the James River). 



Note on nomenclature. — Two other technically unnamed r^brid walnut 

 trees produced by Luther Burbank are the "Royal," a cross between Juglans 

 nigra and Juglans hindsii (Jepson) Rehder, and the "Paradox," which is a hybrid 

 between a form of Juglans californica S. Watson and Juglans regia Linnaeus. 



Tenn., Mo., Ohio, Ind., Iowa). 

 Walnut-tree (Pa., S. C). 

 Dent-soo-kwa-no-ne ( = Round Nut, 



N. Y. Indians). 

 Gun-wood (trade). 

 American Walnut (trade). 



Hybrid. 



of this h.ybrid 



Juglans rupestris Engelmann. 19 



little Walnut. 



Range. — Central, southern, and western Texas (Colorado, Llano, and Guada- 

 loupe Rivers); western Oklahoma; southeastern New Mexico. 



NAMES IN USE 



Western Walnut (Tex.). 

 Dwarf Walnut (Tex.). 

 Little Walnut (Tex.). 



Walnut (N. Mex.). 

 Mexican Walnut. 

 Texas Walnut (lit.). 



" Two rather distinct forms of this species exist; one, the eastern form, is characterized in general by 

 its small narrow leaflets and very small nuts; the other, the western form, has larger and broader leaflets 

 and very much larger nuts. Other less conspicuous distinctions are available. But in the central part 

 of the tree's range (western Texas and New Mexico), where the two forms occur together, there are many 

 intermediate forms, indicating that the extreme eastern and western forms gradually become merged. 

 Britton and Shafer (North American Trees, 221, 1908) have taken up for the western form of Juglans rupest- 

 ris, Juglans major (Torrey) Heller (Muhlenbergia, I, 50, 1900), this name being based on Juglans rupestris 

 var. major Torrey (1853), a name which the writer prefers to maintain. 



