14: HOUGH'S AMERICAN WOODS. a 2 bed* 



ds Entire, but with 1-4 glandular teeth at b.; fr. twisted samara. 



TREE-OF-HEAVEN (Ailanthus glandulosa) . 

 d* Serrate; 



e Leaflets 3-11, the lateral sessile, and successively larger towards the terminal 



one; fr. a nut enveloped in a 4-valved woody husk; leaflets 

 f 3-5, lanceolate; nut small, compressed, 



g 4-angled; husk rather thick and parting to b. 



SOUTHERN SHELL-BARK HICKORY (H. Carolinae-Septentrionalis). 

 g 2 Scarcely angled, husk rough, very thin and splitting with difficulty if 



at all NORTHERN HICKORY ( H. borealis ) . 



f 2 5, lance-ovate to obovate; fr. with very thick husk splitting freely to b. 



SHAG-BARK HICKORY (H, ovata,). 

 f 3 Both 5 and 7 ; fruit 



g More or less compressed pyriform; husk thin and tardily dehiscent; nut 



quite smooth and thick-shelled PIG-NUT HICKORY (H. ylabra) . 



g2 Subglobose with husk splitting freely; nut small, 



h Thin-shelled SMALL-FRUITED HICKORY (H. microcarpa) . 



h2 Thick-shelled PALE-LEAF HICKORY (H. villosa) . 



f* 7-9, mostly obovate and large; fr. with thick free-splitting husk and thick- 

 shelled ribbed nuts; petioles and new growths 

 g Densely hirsute; bark with rough firm ridges (not shaggy) ; nut globular 



or little compressed MOCKER-NUT HICKORY (H. alba) . 



g2 Glabrous or pubescent; bark shaggy with long strips; nut very large, 



compressed KING-NUT HICKORY ( H. laciniosa ) . 



fs 7-11, lanceolate to narrow obovate, the lower ones somewhat falcate; fr. 

 with elevated sutures; nut with thin shell and generally bitter cornel. 

 g Nut smooth, whitish and little compressed. 



BITTER-NUT HICKORY (H. minima). 

 g 2 Very rugose, ridged and compressed, brownish. 



WATER HICKORY (H. aquatica). 

 f 9-11 lance-ovate, falcate; fr. cylindrical-oblong, husk thin. 



PECAN (H. Pecan). 

 e 2 Leaflets 9-15, subsessile (except the terminal one) with reddish stems; fr. 



very small berry-like apples in loose cymose clusters; leaflets 

 f Acuminate, glabrous and teeth scarcely spreading; leaf-buds glutinous. 



AMERICAN MOUNTAIN ASH (Sorbus Americana). 

 f 2 Acute or obtuse a. 



g Leaf-buds with rusty appressed hairs; Ifts. glabrate ab.; teeth spreading. 



LARGE-FRUITED MOUNTAIN ASH (8. scopulina) . 

 g2 Leaf-buds whitish tomentose; Ifts. pubescent. 



ROWAN TREE (Sorbus Aucuparia) . 

 es Leaflets 11-19 and 



f Sessile, viscid-pubescent as is all new growth; fr. nut with indehiscent 



husk BUTTERUNT (Juglans cinerea) . 



f2 Petiolulate, glabrous and leaf-stems spiny bn. ; fr. capsule. 



PRICKLY ASH (Xanthoxylum Clava-Herculis) . 

 e* Leaflets 13-25, 



f Lance-ovate and green bn.; twigs glabrate; a large tree; fr. nut with 

 indehiscent husk BLACK WALNUT (Juglans nigra) . 



f 2 Lanceolate, pale pubescent bn.; twigs velvety; a small tree; fr. drupelets 

 with crimson hair STAG-HORN SUMACH (Rhus hirta) . 



