54 KEY AXD FLORA 



tang, thick-shelled, with a very sweet kernel. Wood hard and heavy. 

 Common in rich, damp soil W. 



4. C. alb* K. Koch. MOCKER XCT. WHITE-HEART HICKORY. A 

 large tree 70-100 ft. high, with close, rough bark ; catkins, twigs, 

 and under surfaces of the leaves downy and resinous-scented when 

 young. Leaflets 7-9, oblong-lanceolate or obovate-lanceolate, taper- 

 pointed. Fruit globose or nearly so, with a very thick, hard husk; nut 

 with 4 ridges toward the apex, very thick-shelled, with a small, sweet 

 kernel. On rich hillsides. Wood much like that of C. otata. 



5. C. cordifonnis K. Koch. PIGXUT. SWAMP HICKORY. A me- 

 dium-sized tree, with rather smooth bark. Leaflets 7-11, lanceolate 

 or oblong-lanceolate. Fruit not huge, husk thin ; nut globular, with 

 a short point, very thin-shelled ; kernel extremely bitter. Moist soil, 



in the Middle States. 



17. BETTJLACEJB. BIRCH FAMILY 



Trees or shrubs with alternate, simple, petioled leaves, with 

 usually deciduous stipules. Flowers monoecious in cylindrical 

 or subglobose catkins. Staminate catkins drooping ; flowers 

 13 in the axil of each bract; calyx none or membranous 

 and 2 4- parted; stamens 2-10, distinct. Pistillate catkins 

 drooping, spreading, or erect and spike-like ; flowers with or 

 without a calyx ; ovary solitary, 1-2-celled ; ovules 1-2 in each 

 celL Fruit a 1-celled nut or a key.* 



L CORYLUS L. 



Shrubs with prominently veined, cut-toothed leares, which 

 are folded lengthwise in the bud. Flowers expanding before 

 the leaves. Staminate flowers in slender, drooping catkins ; 

 stamens 8, anthers 1-celled. Fertile flowers several in a 

 duster or in rery short catkins at the ends of the twigs of 

 the season ; ovary incompletely 2-celled ; style short; stigmas 

 2; bractlets 2. becoming enlarged and inclosing the single 

 bony nut at maturity.* 



1. C. americana Walt. H AZELXCT. A shrub 2-5 ft. high ; young 

 twigs and petioles covered with brownish, stiff hairs. Leaves not 

 very thin, round-cordate, acute or slightly taper-pointed, irregularly 

 toothed, nearly smooth above, downy below. Involucre longer than 



