542 ARBORETUM AND FRU‘TICETUM. PART III. 
Colubrina (from coluber, a snake; in allusion to the twisted stems) ¢77fldra Brongn. and Don’s Mill., 
2. p. 36., the Rhamnus triflbrus of Moc. et Sesse; and C. Mociniana G. Don, the Ceandthus Moci- 
A hen of Dec., are Mexican shrubs; the latter introduced in 1824. ‘There are some Nepal species 
of this genus, not yet introduced, which will probably be found hardier than those from Mexico. 
Willemétia (in honour of C. L. Willemet, author of Herbarium Mauritanium) africana Brongn. 
and Don’s Mill., 2. p. 38.; the Ceandthus africanus of Lin. Seb. Thes., 1. t. 22. f. 6., is a Cape shrub, 
which has been an inhabitant of our green-houses since 1712. It is readily distinguished by its 
purplish red branches, and lanceolate, serrated, shining leaves. It is an elegant shrub, consider- 
ing the order to which it belongs; and, on a conservative wall, would deserve the preference to 
any that we have enumerated. ‘ : 
Pomadérris (from poma, 4 lid, and aerris, a skin; in allusion to the membraneous covering 
to the capsule) elliptica Labill., Don’s Mill., 2. p. 38., Sims Bot. Mag., t. 1510., (fig. 218.) is a 
- shrub from Van Diemen’s Land, growing to the height 
X of 6 ft., and introduced in 1805. It bears a general re- 
semblance to Ceanvthus azireus; but it has smoother 
and more shining foliage, and cream-coloured flowers. 
Being a native of Van Diemen’s Land, it will  pecag 
be found tolerably hardy. There are several other Aus- 
tralian species, and some from the South Seas, which 
will be found enumerated in Don’s Milder, and in our 
Hortus Britannicus, all of which might be tried against 
a conservative wall. 
The genera Cryptandra Smith, Bartlingia Brongn., 
Solenantha G. Don, Tetrapasma G. Don, Trichocéphalus 
Brongn., Phylica Lin.,Soutangza Brongn.,Gouania Jacq., 
Carpodétus Forst., and Olénia Thunb., all afford ligne- 
ous plants, marked in Don’s Mi/ler and in our Hortus 
Britannicus as inhabitants of the green-house; but, as 
far as we have observed, none of them have been tried 
against a conservative wall, except Phylica ericdides Lin. 
(Bot. Mag.,t. 224., and our fig. 219.), which is a heath-like : 
shrub, growing from 2 ft. to3ft. in height; and producing white flowers from April to September, 
which, in dry warm situations, on sandy soil, will pass the winter in the open air, with a little pro- 
tection. 


CHAP. XXXVI. 
OF THE HALF-HARDY LIGNEOUS PLANTS OF THE ORDER 
BRUNIA CEZ. 
THERE are nine genera included in this order in Don’s Milley ; and the species are mostly natives 
of the Cape. They are ‘* much branched heath-like shrubs, with small, smooth, or hardly pilose 
leaves,’’ and small, capitate or rarely panicled, spiked and terminal, or solitary flowers, They 
almost all require a heath soil, and to be propagated by cuttings, in the manner of heaths. Many of 
_ them are, doubtless, as hardy as some of the Cape heaths have been proved to be; and, where there , 
is an extensive range of conservative walling, a few of each genus might be tried against it. Even 
if they did not live through the winter, their foliage and flowers, during summer, would be interest- 
ing and ornamental, and a stock of plants for turning out annually might be kept in pits. 

CHAP. XXXVII. 
OF THE HARDY OR HALF-HARDY LIGNEOUS PLANTS OF THE ORDER 
HOMALINA‘CER. 
DIsTINCTIVE Characteristics. Calyx funnel-shaped, its tube usually adnate 
to the ovary, its limb with 5—15 lobes. Petals inserted into the calyx, as 
many as its lobes, alternate with them, smaller than they, and deemed by some 
an inner whorl of lobes of the calyx. Glands present in front of the segments 
of the calyx. Stamens arising from the base of the petals, either singly, or in 
threes or sixes. Anthers 2-celled, opening longitudinally. Ovary 1-celled, 
with numerous ovules. Styles 3—5, simple. Ovules attached to as many 
parietal placentas as there arestyles. Fruit berried or capsular. Seeds small, 
ovate, or angular, with an embryo in the middle of fleshy albumen. Trees or 
shrubs. Leaves alternate, with deciduous stipules, toothed or entire. Flowers 
in spikes, racemes, or panicles. (Lindley Introd. to N. S., p.79., adapted.) The 
ligneous species and varieties of which there are living plants in British col- 
