874 



ARBORETUM ET FRUTICETUM BRITANNICUM. 



1591. Q. Catesba;'!. 



1392. Q. CiteshtcH. 



pretty large, of a blackish colour, and partly covered -with a fine grey dust, 

 v,-hicli is easily rubbed off between the fingers : they are contained in thick 

 cups, swollen towards the edge, with the upper scales bent inwards. The 

 leaves vary very little, as will be seen by ,/?g. 1592., in which a represents a 

 seedling of one year's growth, and b a leaf from a plant two years old. 



vi. Nlgrce. Black American Oaks. 



Sect. Char., ^-c. Leaves wedge-shaped, or imperfectly lobed ; mucronated, but 

 the mucros generally dropping off when the leaves have attained their full 

 size. Leaves dying off of a blackish green, and in America frequently per- 

 sistent. Bark black, and not scaling off. Fructification biennial. Nut 

 ovate, with a persistent style, and sometimes marked with dark lines. Trees 

 from 20ft. to 40 ft. high; and one of them, a miniature tree, often not 

 exceeding 3 ft. in height. Rate of growth less rapid than in the preceding 

 sections. 



5? 21. Q. ni'gra L. The Black Jack Oak. 



Identification. Lin. Sp. PI., 1413. ; Michx. Quer., No. 12. ; Pursh Fl. Amer. Sept., 2. 

 Synony?)ies. Q. marylandica, &c., Rati; Q. ferruginea il/ic/f-r. N. Avicr. Syl. 1. p. 7 



aquatica Lodd. Cat. ed. 1836 ; Barrens Oak, Amcr. 

 Engravings. Michx. Quer., t. 22, 23. ; and oxirjig. 1593. 



Spec. Char., Sfc. Leaves wedge-shaped, somewhat heart-shaped at 

 dilated, abrupt, and very slightly 3- 

 lobed at the end ; the middle lobe 

 shortest, smooth above, rusty be- 

 neath. Calyx hemispherical, with 

 membranous scales. Nut roundish 

 ovate. ( JVi/ld.) A low deciduous 

 tree. New Jersey, Maryland, and 

 Virginia. Height 20 ft." to 30 ft. 

 Introduced before 1739. 



The Black Jack Oak, according to 

 Michaux, is sometimes 30 ft. high, and 

 8 or 10 in. in diameter, but commonly 

 does not exceed half these dimensions. 

 Its trunk is generally crooked ; and it 

 is covered with a verj' hard, thick, and 

 deeply furrowed bark, which is black 

 on the outside, though the inner bark 

 is of a dull red. The head of the tree 

 is broad and spreading, even in the no:. 9. nice*. 



p. 629. 



y. t. 20. ; Q. 



the base ; 



