MONOECIA, POLYANDRIA. % 219 
The original speciesof the genus ( C. Betulus) is indi s 
£enous to Europe, there is also a third in the Levant. Be 
7 57, OSTRYA. Micheli. (Hop-hornbeam Tree.) — 
:< Ament imbricated. ~Mase. Calix consisting 
of scales. Filament of the stamina ramose. 
Fem, Ament naked. Capsules inflated, imbrica- 
ted at the base, 1-seeded. 
Habit similar to that of preceding genus. = 
Species. 1. O. virginica.—Of this genus ae iS @ $@- 
cond species in Europe. 
758. PLATANUS. L. (Buttonwood. Spcateare) 
Ament globose, Masc. Calix none. Corolla 
st. nthers adnate to the fila- 
e Fem. Calix many-leaved. 
Corolla none. Stigmas recurved. Capsulessub- | 
clavate, 1-seeded, mucronate with the style, 
i. pappose at the base. 
Be ¢ trees; leaves (as in the Maple) palmately To 
or angularly divided; stipules large; aments: el be 
Species. 1. P. oceidentalis.-OF this g 
feavad involucrum. Calize and corolla Palin Fi 
laments numerous. Fem. Ament globose, also 
es with a 4-leaved involucrum, a 
- I-leaved, urceolate, 2-flowered. Si 
sules 2, praia t eSior we . 
celled, many-seeded. — ; 
Balsamiferous trees with sinua tely. fatash 
(similar to those of the Maple); aments aggregated, termi- 
nal, masculine deciduous, females pedunculated and 
dulous. 2 
Species. 1. L. Styracifua. From New Englan 
rida, also indig enous to Mexico and extending 
