Fruit ripens about with Concord but colors early, appears to keep well. Clusters small and short, slightly tapering, sometimes single-shouldered, variable in compactness; peduncle short, inclined to slender; pedicel short, slender to medium, covered with numerous inconspicuous warts; brush short, of average thickness, dark wine color. Berries irregular in size, averaging small, roundish to slightly oblate, jet-black, glossy, covered slightly with blue bloom, usually persistent, firm. Skin intermediate in thickness, tough, adheres slightly to the pulp, contains a large amount of dark purplish-red pigment, not astringent. Flesh greenish, with distinct tinge of red, rather transparent, moderately juicy, somewhat tender, fine-grained, spicy, sweet to agreeably tart at center, not good enough in quality for dessert purposes. Seeds separate from the pulp somewhat easily, one to four in number, average two, intermediate in size and breadth, short to medium, sharp-pointed, dark brownish; raphe buried in a shallow, narrow groove; chalaza large with surface roughened and warty, central to slightly above, irregularly pear-shaped, distinct. ISABELLA. (Labrusca, Vinifera.) =1.= _Amer. Farmer_, =5=:241. 1823. =2.= _Ib._, =9=:221, 294, 309, 325. 1827. =3.= _Sou. Agr._, =2=:552. 1829. =4.= Prince, =1830=:165. =5.= Spooner, =1846=:13, 29, 49. =6.= _Horticulturist_, =6=:410, 412. 1851. =7.= _U. S. Pat. Off. Rpt._, =1851=:48-51. =8.= _Am. Pom. Soc. Cat._, =1852=:54. =9.= _Horticulturist_, =15=:73. 1860. =10.= _Gar. Mon._, =2=:156, 265. 1860. =11.= _Ib._, =5=:73, 74. 1863. =12.= _N. Y. Agr. Soc. Rpt._, =1864=:42, 45, 141. =13.= _Mag. Hort._, =31=:107, 157. 1865. =14.= Husmann, =1866=:18, 79, 122. =15.= Downing, =1869=:542. =16.= _Grape Cult._, =2=:76. 1870. =17.= _Ib._, =3=:67, 103. 1871. =18.= _Gar. Mon._, =14=:105, 167, 296. 1872. =19.= _Horticulturist_, =29=:20, 245. 1874. =20.= _Am. Pom. Soc. Rpt._, =1883=:57, 124, 128. =21.= _Bush. Cat._, =1883=:110. =22.= _Rural N. Y._, =50=:418, 482. 1891. =23.= _Ill. Sta. Bul._, =28=:255. 1893. =24.= _Kan. Sta. Bul._, =44=:116. 1893. =25.= _N. Y. Sta. An. Rpt._, =15=:432, 433. 1896. =26.= _N. Y. Sta. An. Rpt._, =17=:531, 541, 544, 548, 552. 1898. =27.= _Ala. Sta. Bul._, =110=:83. 1900. =28.= _Rural N. Y._, =59=:719, 722. 1900. _fig._ =29.= _Traité gen. de vit._, =5=:203. 1903.