_Grosse Schwarze Knorpelkirsche._ =6.= Truchsess-Heim _Kirschensort._ 180-192. 1819. =7.= Dochnahl _Führ. Obstkunde_ =3=:36. 1858. =8.= _Ill. Handb._ 89 fig., 90. 1860. =9.= Lauche _Deut. Pom._ =III=: No. 6, Pl. 1882. =10.= Mathieu _Nom. Pom._ 357, 358. 1889. _Tradescant's Black Heart._ =11.= Downing _Fr. Trees Am._ 188 fig., 189. 1845. =12.= Thompson _Gard. Ass't_ 526. 1859. =13.= _Am. Pom. Soc. Cat._ 74. 1862. _Gros Bigarreau Noir._ =14.= Mortillet _Le Cerisier_ =2=:108-111, fig. 24. 1866. =15.= Leroy _Dict. Pom._ =5=:224, 225 fig., 226. 1877. _St. Margaret's Cherry._ =16.= _Flor. & Pom._ 105, Pl. 542. 1881. Elkhorn has served its day and is now being rapidly superseded by other cherries of the Bigarreau group to which it belongs. It was valued by the old pomologists because of the large size of the fruit, the firm flesh, late ripening, rich flavor, and because it hangs well on the tree long after maturity. But it fails in competition with other Bigarreaus in bearing cherries quite variable in size, in the diminishing size of the fruit as the trees attain age and more than all else in being but moderately productive. The bark of the trunk and main branches is so heavily overspread with gray as to make this a distinguishing mark. The fruit, too, is distinct in appearance by reason of the irregular surface of the skin. The variety possesses no characters, as it usually grows, to make it worth planting either for home or market.