1342 ARBORETUM AND FRUTICETUM. PART III. 
Plagidnthus divaricatus Forst., t. 43., is a native of New Zealand, and was introduced in 1822. 
It is tolerably hardy ; a plant having lived with us at Bayswater, with very little protection, since 
1829. P. sidéides Hook. Bot. Mag., t. 3396., is a twiggy shrub, from 2 ft.to 3ft. high, probably also 
as hardy as the other. Both species flower in April. 
Clugiia alaterndides Bot. Mag., t. 1321., has been an inhabitant of our green-houses since 1692. It 
is a native of the Cape of Good Hope, and would probably stand against a conservative wall, 
CHAP. C. 
OF THE HARDY LIGNEOUS PLANTS OF THE ORDER URTICA‘CER. 
TuEsE are included in five genera, which have their names and characters 
below. 
Mo’rvus Tourn. Flowers unisexual; those of the 2 sexes, in most species, 
upon the same plant; in M. nigra Poir., and, according to Gronovius (Virg., 
146.), in WM, rubra L., upon distinct plants: according to Kalm (Act. Suec., 
1776), the sexes of M. ribra L.are polygamous.—Male flowers disposed 
in a drooping, peduncled, axillary spike. Calyx of 4 equal sepals, imbri- 
cate in zstivation, expanded in flowering. Stamens 4. A rudiment of a 
pistil is present. — Female flowers in ovate erect spikes. Calyx of 4 
leaves, in opposite pairs, the outer pair the larger, all upright and persistent, 
becoming pulpy and juicy. Ovary of 2 cells, one including one pendulous 
ovule, the other devoid of any. Stigmas 2, long. In the state of ripeness, 
each ovary is a fleshy and juicy utricle, and is covered by the fleshy 
and juicy calyx: the aggregate of the ovaries and the calyxes from a 
spike of flowers constitutes what is termed a mulberry. Seed pendulous 
— Species several ; natives of Asia, south of Europe, and North America. 
Trees. Sap white. Leaves alternate, large, mostly lobed, and rough ; the 
favourite food of the silk-moth (Bombyx mori F.) in its caterpillar state. 
(Chiefly from 7. Nees ab Esenbeck, Gen. Pl. Fl. Germ.) 
Broussone‘r14 L’Hérit. Flowers unisexual; those of the two sexes upon 
distinct plants. — Male flowers in pendulous cylindrical catkins; each 
flower in the axil of a bractea. Calyx shortly tubular, then 4-parted. Sta- 
mens 4, elastic.—Female flowers in peduncled, axillary, upright globular 
heads. Calyx tubular, its tip with 3—4 teeth. Ovary within an integument 
that arises from the bottom ofthe calyx. Style lateral, prominent. Stigma 
taper. Fruit club-shaped, proceeding from the bottom of the calyx, and 
extended much beyond its tip; and consisting of the integument in which 
the ovary was enclosed, and now become very juicy; and of a 1-seeded 
oval utricle with a crustaceous integument, and enclosed within the juicy. 
integument.— Species 1, native to Japan and the isles of the Pacific Ocean. 
A tree, with leaves large, lobed or not, andhairy. (Du Hamel, Traitée des 
Arbres, ed. nouv.; and the Penny Cyclopedia.) 
Mactu‘r4 Nuttall. Flowers unisexual; in M. aurantiaca Nutt., and M. 
tinctoria .D. Don, those of the two sexes upon distinct plants; if not so in 
the rest, then upon the same plant. What follows relates to M. aurantiaca 
Nutt. — Male flowers in a very short almost sessile racemose panicle of 12 
or more flowers. Calyx 4-parted. Stamens 4, in some instances 3, — 
Female flowers closely aggregate upon an axis, and forming a globular head 
that is borne upon a short axillary peduncle. Calyx oblong, urceolar, 
apparently with 4 lobes at the tip: it includes the ovary, which is situated 
above its base, and is terminated by a style that is thread-shaped, downy, 
and protruded beyond the calyx to the length of nearly lin. The ovary 
becomes an achenium about = in. long, half as much broad, compressed, 
oval, with the tip blunt and unsymmetrical from an indentation on one side 
in which the style had been attached. — A tree, native of North America. 
Spiny : spines axillary. Sap white. Leaves alternate, ovate. Stipules 
minute, deciduous. (Nuttall ; Gard. Mag., vol. xi, p.312—316., and vol. 
xii. p. 210.; and observation.) 
