APETALOUS EXOGENOUS PLANTS. 509 



old only on the veins beneath; .ymies of the involucre 

 short, recurved. Damp sandy soil. April. — A large ti'ee, 

 with widely spreading branches. 



CORYLUS, Tourn. Hazel-nut. 



Sterile floiuers in cylindrical pendulous bracted aments; 

 calyx 2-cleft, partly united with the bract; stamens 8; 

 anthers 1-celled ; fertile flowers clustered ; ovary 2-celled, 

 2-ovuled; stigmas 2, filiform; involncre tubular at the 

 base, leafy and lacerated at the summit, inclosing a single 

 bony (edible) nut. — Shrubs, with broadly cordate dou- 

 bly serrate petioled leaves; flowers appearing before the 

 leaves. 



C. ROSTRATA, Ait. (Beaked Hazel-nut.) Branclilets 

 smooth; leaves ovate or oblong-ovate, slightly cordate, 

 acuminate, finely serrate, rather thin, pubescent; involucre 

 bristly, prolonged into a tube above the nut, 2-cleft and 

 toothed at the summit; fruit nearly globular. Kich soil. 

 March-April.— 5/i;-w&, 4°-6° high. 



CARPIXUS, L. HORNBEAil. 



Floiuers destitute of floral envelopes, supported by scale- 

 like bracts; sterile floiuers in drooping cylindrical aments; 

 stamens ^-14:', filaments short; anthers 1-celled, hairy at 

 the apex ; fertile flowers spiked ; Iracts 2-flowered, de- 

 ciduous; o?;«r2/ 2-celled, 2-ovuled ; 5/z^/?m5 2, filiform ; nut 

 solitary, angular, sessile in the axil of an open 3-lobed, leaf- 

 like involucre. — Trees, with simple ovate or oblong straight- 

 veined deciduous leaves, folded in the bud ; flowers expand- 

 ing before the leaves. 



C. Americana, Michx. {Hornbeam.) B r an chlets smooth 

 and slender; leaves oblong-ovate, acute or slightly acumi- 

 nate, sharply and doubly serrate, rounded at the base, more 

 or less pubescent ; fertile spikes terminal, long-peduncled, 



