246 ARBORETUM AND FRUTICETUM. PART III. 



London Horticultural Society, where one plant, on a wall exposed to the east, 

 grows vigorously without any protection, and flowers freely in warm summers. 

 On the whole, it is a very desirable species. It grows best in " a loamy soil, 

 and is readily multiplied by layers." (D. Don.') 



App. i. Doubtful Species of Clematis, 



In Sweet's Hort. Brit, are enumerated C. ternijlbra Dec, said to be in- 

 troduced (from what country is uncertain) in 1826; C.biterndt'a Dec, from 

 Japan, in 1825 ; C. dahurica Dec, from Dahuria, in 1822 ; C. diversifolia Dec, of 

 uncertain origin; C. japonica Dec, from Japan, in 1826; C. semitriloba Dec, 

 from Spain, in what year is uncertain; C. viornoides Jac (which we have con- 

 sidered as a synonyme of C. campanifldra), in 1826. These species, or 

 names, will be found followed by specific characters in De Candolle's Pro- 

 dromus, and in Don's Miller ; but, as they are not now to be met with in the 

 gardens about London, we have deemed it not advisable to occupy our pages 

 by describing them. 



App. ii. Anticipated Introductions. 



On recurring to the lists in the historical part of this work, and comparing 

 the names there given with those of the species described in the foregoing 

 pages, it will be found that we are already in possession of all the species of 

 Clematis which are considered to be natives of Europe. Of those of Asia, 

 C. nepalensisy pubkscens, xitifolia, and Bucha?ianva.na,, according to the list 

 in p. 173., may be expected from the Himalaya. From China, C. intricattt (men- 

 tioned p. 176.) may be expected ; and, from North America, there are the names 

 C. holosericea, Walter\ y and Catesbyhnu, which are not in our Catalogues as 

 already introduced. There are probably other species in the mountainous 

 regions of Asia, and in China, which will endure the open air in England ; and, 

 as the seeds of the genus are light, not bulky, and very tenacious of life, the 

 probability of their growth will amply repay travellers for the trouble of col- 

 lecting them. 



Genus II. 



yfTRA'GENE L. The Atragene. Lin. Sysl. Polyandria Polygynia. 



Identification. Lin. Gen., p. 615. ; Willd. Baum., p. 45. ; Dumont, 4. p. 4'26. ; Hayne Dend., 118. ; 

 Don's Mill, 1. p. 10. 



Synonymes. Clematis Lam. and Dec. ; Atragene, Fr. and Ger. 



Derivation. The name of atragene appears to be taken from two Greeks words ; athros, pressed, and 

 genos, birth ; alluding, as it is supposed, to the manner in which the branches press against or clasp 

 the trees that support them. It was first used by Theophrastus, and was by him applied to Cle- 

 matis Vitalba L. 



Gen. Char. Involucre none. Sepals 4, somewhat induplicate in the bud. 

 Petals numerous, shorter than the sepals. Cariopsides (carpels) terminated 

 by a bearded tail. Cotyledons approximate in the seed. — Climbing deci- 

 duous shrubs, with variously cut opposite leaves. (J)on's Mill., i. p. 10.) 

 Perhaps no genus was ever distinguished from another on slighter differences 

 than those extant between Clematis and Atragene. These are, the presence 

 of petals in the flowers of the latter genus ; though this is scarcely the case 

 inyl.ochotensis; and, in the double-flowered variety of C. Viticella, the meta- 

 morphosed stamens, which give the flower its fulness, are considered to be 

 petals. Hence De Candolle regards the different species of Atragene only 

 as a section of the genus Clematis (§ iv. Atragene, Prod.,i. p. 9.); but, as 



