328 MONOECIA.— POLYANDRIA. 



653. CASTANEA. sterile fl. in a long, naked cy 

 lindrical ament. Cal. 1 -leaved, 6-cleft. Stam. 

 10 — 12. fertile fl. 3. Involucrum 4-lobed;, 

 thickly muricate. Cal. 5 — 6-lobed. Styles 6. 

 Nut mostly 1 -seeded, invested with the enlarg- 

 ed involucrum. 



554. BETULA. sterile fl. in a cylindrical ament ; 



scales peltate, 3-flowered. Cal. 0. Cor. 0. 

 Stam. 10 — 12. fertile fl. Scales of the ament 

 3-flowered. Cal. 0. Cor, 0. Styles 2. Nuts 

 compressed, with a broad- winged margin, 1- 

 seeded. 



555. CARPINUS. sterile fl. in a cylindrical ament : 



scales ciliate. Stain, about 10. fertile fl. 

 in a loose ament; scales large, 3-lobed, 1 — 2- 

 flowered. Cal. 3-cleft. Styles 2. Nut ovate, 

 sulcate, 1 -seeded. 



556. OSTRYA. sterile fl. in a cylindrical ament ; 



scales 1 -flowered. CaZ. 0. Filaments branched 

 fertile fl. Ament naked. Cal. 0. Cor. 0. 

 Ca/9$. inflated, imbricate, 1-seeded at the base, 



557. PLATANUS. Flowers in globose aments. sterile 



Cal. 0. Cor. minute. Anth. adnate to the fila- 

 ments from the base, fertile. Cal. many- 

 parted. Cor. 0. Stig. recurved. Caps, sub- 

 clavate, 1-seeded, mucronate with the per- 

 sistent style ; base surrounded with a hairy 

 pappus. 



558. LIQTJIDAMBAR. sterile fl. in a conic ament* 



surrounded with a 4-leaved involucrum. Cal. 

 and Cor. 0. Filam. numerous, sterile fl. 

 Ament globose, surrounded with a 4 -leaved in- 

 volucrum. Cal. 1-leaved, urceolate, 2-flower- 

 ed. Styles 2. Capsules 2, surrounded by the 

 base of the calyx, 1-celled, many-seeded. 



559. JUGLANS. sterile fl. Ament imbricate ; the 



scales mostly 5-parted. Cal. about 5-parted. 

 Stam. 20 — 30. fertile fl. Cal. 4-cleft, su- 

 perior. Cor. 4-parted. Styles 1 — 2. Drupe 

 partly spongy ; nut rugose and irregularly fur- 

 rowed. 

 . CARYA. sterile fl. Ament imbricate : scale? 

 3-parted. Cal. and Cor. 0. Stam. 4 — 6. fee 



