a* b c* KEY, BASED UPON LEAVES. 15 



c2 LEAVES OPPOSITE; LEAFLETS 



d 3-7, entire at base, serrate or serrate lobed above; fr. samaras obliquely winged 



and in pairs jointed together at b Box ELDER (Acer ~Negundo). 



d2 5-11 and fr. a straight samara with terminal wing. 



e Samara with seed-bearing portion flattened and wing extending the entire 



length 

 f Lateral leaflets sessile; calyx in the fertile flowers none. 



BLACK ASH (F. nigra). 

 f2 Lateral leaflets stalked; calyx present 



g Samara obovate to spatulate; twigs terete. 



WATER ASH (F. Caroliniana). 

 g2 Samara elliptic to spatulate; twigs 4-sided. 



BLUE ASH (F. quadrangulata) . 

 e'- Samara with seed-bearing portion subterete; wing not extending to base; 



leaflets stalked; calyx present in fertile flower 



f Wing almost entirely terminal slightly if at all decurrent on body 

 g Leaves and branchlets glabrous or nearly so. 



WHITE ASH (F. Americana). 

 g2 Leaves beneath and branchlets pubescent. 



BILTMOBE ASH (F. Biltmoreana) . 



f2 Wing decurrent somewhat on sides of body but not to base 

 g Wing of samara spatulate 



h Branchlets and leaves glabrous or nearly so; leaves green beneath. 



GREEN ASH (F. lanceolata). 

 h2 Branchlets and petioles velvety pubescent 

 i Samara less than 2 in. long; calyx small. 



RED ASH (F. Pennsylvanica) . 

 i2 Samara mostly 2 in. long or more; calyx enlarged. 



PUMPKIN ASH (F. profunda). 



g2 Wing of samara long-linear DARLINGTON ASH (F. Darlingtonii). 



b2 Palmately compound; fr. large coriaceous capsule; leaflets membranaceous and 



usually 

 c 7, lance-obovate, cuneate, apiculate a., wrinkled. 



HORSE CHESTNUT (Aesculus Hippocastanum) . 

 c 2 5 (sometimes 6 or 7) 



d Oval or oblong, subsessile or acute or short acuminate a. 



OHIO BUCKEYE (Aesculus glabra) . 

 d 2 Obovato-oblong, short-stemmed, acuminate. 



SWEET BUCKEYE (Aesculus octandra). 

 a 3 DECOMPOUND LEAVES; 



b Evenly bipinnate, with 8-12 pairs of pinnae each with many oblong oblique leaflets 



about % in. long; fr. pod MIMOSA TREE (Albizzia Julibrissin) . 



b? Irregularly bipinnate or sometimes ternate, single leaflets taking the place of some ' 



pinnae; petioles 

 c Armed with prickles; fr. many small dark purple berries. 



HERCULES CLUB (Aralia spinosa). 

 c2 Unarmed; fr. large broad pods with large seeds and sweet pulp. 



COFFEE-TREE (Gymnocladus doicus). 



