834 



ARBORETUM ET FRUTICETUM BIIITANNICUM. 



by the exudation of the sap and the admission of the weather, no 

 to throw up vigorous shoots, and it will decay in a few years. 



2. A. OBLONGA'TA Willd. The oblong-leaved Alder. 



lono-ei 



Identification. Willd. Sp. PI., 4. p. 335. ; Baum., p. 20. ; 



N. Du Ham., 2. p. 215. 



Sunonymes. /i'lnus fol. oblong., &c., Bauh. ; A. fol. ovato- 

 'lanceol, &c., Mill. Diet. ed. 7. ; langliche Else, Ger. 

 Engravings. Our fig. 1515. from a specimen in Sir W. J. 



Hooker's herbarium; and fig. 1516. from a specimen in 



the Museum of the Jardin des Plantes. 





Spec. Char.y fyc 



Leaves elliptic, somewhat 

 obtuse, glutinous ; axils 

 of the veins naked on 

 the under side.(0W.) A 

 large deciduous shrub or 

 low tree. Hungary, Aus- 

 tria, and Turkey. Height 

 20 ft. to 30 ft. Intro- 

 duced in 17^9. Flowers 

 greenish ; March and 

 April. Fruit brown ; ripe 

 in October or November. 



Variety. 



A. pu- 



mila Lodd. Cat. 

 The leaves are 

 somewhat narrower than in the species. 



A. oblonjjata. 



1516. A. oblcngrtla. 



3. A. INCA'NA Willd. The hoary-/<?awc? Alder. 



Identification. Willd. Sp. PI., 4. p. 335. ; N. Du 



Ham., 2. p. 215. ; Hoss Anleilung, p. 190. 

 Synonymes. B. .4'lnus var. incana Lin. Sp. PI. 1394. ; 



B. incana Lin. Suppl. ; B. viridis Fill. Dauph. 2. 



p. 789. ; weisse Erie, graue Else, or weisse Eller, U. 



Ger. 

 Engravings. Hayne Abbild., t. 136. ; and our fig. 



1517. 



Spec. Char., Sfc. Leaves oblong, acute, 

 pubescent beneath ; axils of the veins 

 naked. Stipules lanceolate. (Willd.) 

 A deciduous tree. Lapland, Sweden, 

 and Prussia ; and on the hills in Aus- 

 tria, Carniola, the Ukraine, Tyrol, and 

 Switzerland ; also in North America. 

 Height 50 ft. to 70 ft. Introduced in 

 1 780. Flowers greenish ; March and 

 April. Fruit brown ; ripe in October. 



Varieties. 



A. i. 2 ladnlata Lodd. Cat ed. 1836. The leaves are slightly laci- 



niated. Horticultural Society's Garden. 



^ A. i. 3 glauca. A. glauca Michx. N. Amer. Sylv. ; 2?etula incana var. 



glauca Ait. ; Black Alder, Amer. The leaves are dark green above, 



and glaucous beneath ; the petioles reddish. This is one of the 



most beautiful trees of the genus. 



A. i. 4> angulata Ait. Leaves green underneath, with the petioles 



also of a dark green. 



Other Varieties. A. americdna Lodd. Cat., and A. canadensis Lodd. 

 Cat., appear to belong to this species j but the plants in the Hackney ar- 

 boretum are so small, that we have not been able to satisfy ourselves that 

 they are sufficiently distinct to constitute even varieties. 



1517. A. inckna. 



