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8. Iva.—Involucre gamophyllus. Head an- 
drogynous. 4 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 acup. Trees. Shrubs. 
EK. Flowers incomplete. 2% flowers or both 
and 6, 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. ,., 
DIG@CIA. 
I. Diandria. 
1. Salix.—Amentaceous. -Perigonium 0. 
Fruit an o-seeded capsule. Shrub. 
2. Fraxinus.—Flowers paniculate. Calyx 
obsolete, 4-cleft. ~Fruit a 1-seeded 
samara. Tree, 
