CUPULIFER^E. (OAK FAMILY.) 425 



ers solitary or by pairs, peduncled, surrounded with numerous linear bracts and 

 a 4-lobcd involucre. Calyx of 4 - 5 subulate lobes. Ovary 3-cclled, with two 

 ovules in each cell. Styles 3, filiform. Nuts commonly 2, acutely 3-angled, en- 

 closed in the soft-spiny 4-valvcd involucre. Cotyledons thick and fleshy. 

 Trees, with whitish bark, and straight-veined leaves expanding with the flowers. 



1. P. ferruginea, Ait. Leaves oblong-ovate or rhombic, acute, finely 

 serrate, silky on both sides when young, when old only on the veins beneath ; 

 spines of the involucre short, recurved. Damp sandy soil, Florida, and north- 

 ward. April. A large tree, with widely spreading branches. 



4. CORYLUS, Tourn. HAZEL-NUT. 



Sterile flowers 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. Involucre tubular at the base, 

 leafy and lacerated at the summit, enclosing a single bony (edible) nut. Shrubs, 

 with broadly cordate doubly serrate petioled leaves. Flowers appearing before 

 the leaves. 



S* 1- C. Americana, Walt. (HAZEL-NUT.) Branchlets glandular; leaves 

 round-cordate, coarsely serrate, acuminate, pubescent ; involucre roundish at the 

 base, dilated and flattened above the nut, glandular hairy ; nut roundish, some- 

 what flattened. Rich soil along the margins of woods and thickets, "West Flor- 

 ida, and northward. Feb. and March. Shrub 5 - 6 high, tough and flexible. 

 Leaves 4' - 6' long. 



- 2. C. rostrata, Ait. (BEAKED HAZEL-NUT.) Branchlets 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. Rich soil in the upper districts, 

 and northward. March - April. Shrub 4 - 6 high. 



5. CAKPINTTS, L. HORNBEAM. 



Flowers destitute of floral envelopes, supported by scale-like bracts. Sterile 

 flowers in drooping cylindrical aments. Stamens 8 - 14 : filaments short : an- 

 thers 1 -celled, hairy at the apex. Fertile flowers spiked. Bracts 2-flowered, 

 deciduous. Ovary 2-celled, 2-ovuled. Stigmas 2, filiform. Nut solitary, an- 

 gular, 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 expanding before the leaves. 



_, 1. C. Americana, Michx. (HORNBEAM.) Branchlets smooth and slen- 

 der ; leaves oblong-ovate, acute or slightly acuminate, sharply and doubly ser- 

 rate, rounded at tfie base, more or less pubescent. Fertile spikes terminal, 

 long-peduncled, 6- 1 2-flowered ; involucre unequally 3-lobed, the middle lobe 

 longer and serrate on one side ; nut small, ovate, compressed, 8-ribbed. Rich 

 woods, Florida, and northward. March. A small tree, with hard and close- 

 grained wood. 



36* 



