(76) 



8. Iva. Involucre gamophyllus. Head an- 

 drogynous. $ flowers funnel-shaped, 

 central; ? flowers tubular, peripheral. 



9. Platanus. Flowers without perigonium, 

 densely capitulate on a globose recep- 

 tacle. Tree. 



D. Flowers incomplete; $ flowers amentaceous. 



Stamens inserted on a perigonium. 



1. Castanopsis. Involucre of $ flowers 1-3- 



flowered, afterward enclosing the nut 

 in the shape of a prickly burr. 



2. Quercus. Involucre of ? flowers 1 -flow- 

 ered, surrounding the base of the nut 

 in the shape of a cup. Trees. Shrubs. 



E. Flowers incomplete. $ flowers or both ? 



and $ , amentaceous. Stamens inserted 

 on bract. 



1. Corylus. Fruit a nut, inclosed in a 2- 

 cleft, laciniate involucre. 



2. Myrica. ? flowers amentaceous. Fruit, 

 drupaceous nutlets. Involucre 0. Tree. 



DICE CIA, 

 I. Diandria. 



1. Salix. Amentaceous. Perigonium 0. 

 Fruit an co-seeded capsule. Shrub. 



2. Fraxinus. Flowers paniculate. Calyx 

 obsolete, 4-cleft. Fruit a 1-seeded 

 samara. Tree. 



