HOUGH'S AMERICAN WOODS. a* bed* 



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



TBEE-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. 



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

 g2 Scarcely angled, husk rough, very thin and splitting with difficulty if 



at all NORTHERN HICKORY ( H. borealis ) . 



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



SHAG-BARK HICKORY (H. or at a) . 

 fs 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. glabra) . 



2 Subglobose with husk splitting freely; nut small, 



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



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



f 4 7-9, mostly obovate and large; fr. with thick free-splitting husk and thick- 

 shelled ribbed nuts; petioles and new growths 

 r; 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, 

 ji Nut smooth, whitish and little compressed. 



BITTER-NUT HICKORY (H. minima}. 

 v2 Very rugose, ridged and compressed, brownish. 



WATER HICKORY (H. aquation). 

 f 6 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-i Acute or obtuse a. 



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



LARGE-FRUITED MOUNTAIN ASH (8. scopuliiia). 

 g 2 Leaf-buds whitish tomentose; Ifts. pubescent. 



ROWAN TREE (Sorbus Aucuparia}. 

 e3 Leaflets 11-19 and 



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



husk BUTTERUNT (Juglans cinerea] . 



f 2 Petiolulate, glabrous and leaf-stems spiny bn. ; f r. capsule. 



PRICKLY ASH (Xanthoxylum Clara-Hcrcit //.<?). 

 e* Leaflets 13-25, 



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



indehiscent husk BLACK WALNUT (Juglans niara } . 



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

 with crimson hair STAG-HORN SUMACH (Ifhus hi) In}. 



