descriptive name of Hop Hornbeam. This is a large-growing tree,
specimens in various parts of the country ranging in height from 50 feet
to 60 feet.

O. VIRGINICA.--Virginian Hop Hornbeam. Eastern United States, 1692.
Resembles the latter, but is of smaller growth, rarely exceeding 40 feet
in height. They grow fairly well in almost any class of soil, and on
account of the long and showy catkins are well worthy of cultivation.


OXYDENDRUM.

OXYDENDRUM ARBOREUM (_syn Andromeda arborea_).--Sorrel-tree. Eastern
United States, 1752. Unfortunately this species is not often found under
cultivation, being unsuitable generally for our climate. In some
instances, however, it has done well, a specimen in the Knap Hill
Nursery, Surrey, being 30 feet high, and with a dense rounded head. The
flowers are very beautiful, being of a waxy white, and produced
abundantly. It wants a free rich soil, and not too exposed site.


OZOTHAMNUS.

OZOTHAMNUS ROSMARINIFOLIUS.--Australia, 1827. A pretty little Australian
Composite, forming a dense, twiggy shrub, with narrow, Rosemary-like
leaves, and small, whitish, Aster-like flowers which resemble those of
its near relative, the Olearia, and are produced so thickly that the
plant looks like a sheet of white when the blooms are fully developed.
It flowers in June and July. In most parts of the country it will
require protection, but can be classed as fairly hardy. Cuttings root