648 



ARBORETUM ET FRUTICETUM URITANNICUM. 



The buds are of a deep bine, and the young shoots are 

 sprinkled with dots of the same colour, which disappear as the 

 season advances. The leaves, at their unfolding, are accompanied 

 by scales, which fall after two or three weeks: they are \~2 or 

 15 inches long when fully developed ; and the leaflets are sessile, 

 of a deep green colour, smooth on the upper surface, and coated 

 with red down on the main ribs beneath. When bruised, they 

 emit an odour like that of the leaves of the elder. The sa- 

 maras resemble those of the blue ash (P. quadrangulata), and 

 are nearly as broad at the base as at the summit. The black 

 ash is easily distinguished from the white ash by its bark, 

 which is of a duller hue, less deeply furrowed, and has the 

 layers of the epidermis applied in broad sheets l * 58 bucff &?!! *" 



t 12. F. (A.) QUADRANGULA^TA Michx. The quadrangular-iraHrfo'rf Ash. 



Identification. Michx. Fl. Bor. Amer., 2. p. 255. ; Pursh Sopt., 1. p. 8. ; Don's Mill., 4. p. 55. 

 Synonymes. F. tetragona Cels ex Dum. Cours. ; F. quadrangularis Lodd. Cat. oil. 1836 ; blue Ash, 

 ' Amer. 

 Engravings. Michx. N. Amer. Syl., 3. t. 123. ; and OUT figs. 1259. and 1260. 



Spec. Char*, <frc. Leaflets almost sessile, elliptic-lanceolate, serrated, downy 

 beneath. Samara blunt at both ends. Branches quadrangular. (Don's 

 Mill.) A deciduous tree. Ohio, Kentucky, and Tennessee. Height GO ft. 

 to 70 ft. Introduced in 1823. Flowers greenish yellow ; May. 



Variety. 



t F. (a.) q. 2 nervosa Lodd. Cat. ed. 1836. Leaves with conspicuous 

 nerves. 



The leaves are from 1 2 in. to 18 in. 

 long, and are composed of 2, 3, or 4 

 pairs of leaflets, with an odd one. 

 The leaflets are large, smooth, oval- 

 acuminate, distinctly toothed, and sup- 

 ported by short petiolules. The young 

 shoots to which the leaves are attached 

 are distinguished by 4 opposite mem- 

 branes, 3 or 4 lines broad, and of a 

 greenish colour, extending through 

 their whole length. This 

 character disappears in the 

 third or fourth year, leaving 

 only the traces of itsexist- 

 ence. The seeds are flat 

 from one extremity to the 

 other, and a little narrowed 

 towards the base. Readily 

 distinguished from all the 

 other varieties of American 

 ash, as far as we have been 

 able to observe these in the 

 neighbourhood of London, by 

 the bark of the trunk, which 

 cracks and separates at the 

 edges into thin plates, much 

 in the same way aa that of the white American oak (Quercus alba). 



13. F. (A.) /UGLANDIFO V LIA Lam. The Walnut-leaved Ash. 



Identification. Lam. Diet., 2. p. 543. ; Pursh Sept, 1. p. 9. ; Don's Mill., 4. p. 55. 



Synvwmes. F. viridis Michx. N. Amer. SyJ. 3. p. 65. t. 120. ; F. c6ncolor Muhl. ; the green Ash, 



A/icA*. ; western black Ash, PA. 

 Engravings. Michx. N. Amer. SyL, 3. t. 120. ;, the plate in Arb. Brit., 1st edit., vol. vi. ; and our 



%*. laCl. and 1262. 



1*39. F. (a.) quadrangulfcu. 



