42 



ARBORETUM AND FRUTICETLJM. 



PART III. 



219 



Cslubrina ^from coluber, a snake; in allusion to the twisted stems) triflbra Brongn. and Don's Mill., 

 -2. n. 96., the A'hamnus triflorus of Moc. et Se^se ; and C. Mociuikna G. Don, the Ceanothus Moci- 

 \\\ii)tus 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. 



Wiliemtfia (in honour of C. L. Jl'illemet, author of Herbarium Mauritanium) africana Brongn. 

 and Don's Mill., 2. p. 88.J the Ceanothus africanus of Lin. Seb. Thes., 1. 1. 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. 



Porneuirrris ^from pdma, a 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 

 of 6 ft., and introduced in 1805. It bears a general re- 

 semblance to Ceanothus azureus; but it has smoother 

 and more shining foliage, and cream-coloured flowers. 

 Being a native of Van Diemen's Land, it will probably 

 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 Miller, 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, Trichocephalus 

 Brongn., PhylicaLire.,SouIangm Brongn. ,Gouan/a Jacq., 

 C'arpodetus Foist., and Olinia Thunb., all afford ligne- 

 ous plants, marked in Don's Miller 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 ericokles Lin. 

 {Bot. Mag., t. 224., and our fig. 219.), which is a heath-like 

 shrub, growing from 2 ft. to 3 ft. 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 

 BRUN/^ CEM. 



There are nine genera included in this order in Don's Miller ; 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 N CEJ£. 



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 oflobes 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 are styles. 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. (Lindlcy Introd. to N. S., p. 79., adapted.) The 

 ligneous species and varieties of which there are living plants in British col- 



