141 
different region, and described from Zeyher's plant. so that occasionally Thunberg’s species 
is not described in the `` Flora Capensis ” at all. Added to this, Sonder has accepted 
the nomenclature -of Salm Dyck’s fine work on this genus as unimpeachable, whereas it 
is often entirely wrong, and therefore as the original descriptions of Thunberg and of 
Haworth are often entirely ignored and those of Salm Dyck, belonging to quite a different 
plant, substituted, mach confusion of nomenclature has been made and the descriptions 
in the `` Flora Capensis ' are often quite untrustworthy. And as these errors have not 
been corrected by Berger in his monograph of the genus, since that work was chiefly compiled 
from the works of Salm Dyck and Sonder, there is really needed at the present time a 
carefully worked-out monograph of this very remarkable and highly interesting group 
of plants. This, as | have already stated in the `` Journal of the Linnean Society of 
Botany,’ Vol. XLV, pp. 54-55, can only be properly and fully accomplished by 
comparison with and study of the unique collection of original drawings of a large number 
of Haworth’s types preserved at Kew. 
In the process of comparison and identification of Thunberg’s types with specimens 
in the Kew Herbarium, where Thunberg has mixed two or more species under one name, 
it has become necessary to take as being the plant he intended to bear the name that 
specimen which most accurately agrees with his description. As an example of this kind, 
M. articulatum, Thunb., may be cited. This name, as represented by his specimens, 
includes three distinct species, all very similar in general appearance, and upon a superficial 
examination they might easily be supposed to be one species, so that his description sy 
apply fairly well to all of them. with the exception of the words `` punctate-scabrid ” a 
applied to the stem and calyx. As these words only apply to one of the specimens, idee 
of the others having this character, that particular specimen must be accepted as the type 
of M. articulatum, Thunb. 
In the account of Thunberg’s specimens which follows, the names are arranged in 
alphabetical order as they appear upon his sheets; and to the headline I have only given 
the reference to the well-known edition by Schultes of Thunberg’s `` Flora Capensis,”’ 
published in 1823, other references being given under the determination of the specimens, 
except in those cases where Linnaeus or Linnaeus fil. is the author, as these, of course, 
take precedence over the names of Thunberg, Aiton, or Haworth. Thunberg gives no 
authority for the name on the sheets. 
For the localities mentioned by Thunberg, | have used the modern form of spelling, 
Many of his more interesting species were collected in the Van Rhynsdorp and Calvinia 
Divisions, in the Karroo between the Olifants River and the ‘Bokkeveld Mountains, and 
on or near Hantam Mountains. 
The following is an explanatory list of the abbreviations used for the books quoted :— 
SR eN ERM RE EE ae we N oe W. Aiton, `` Hortus Kewensis,”` ed. 1, Vol. LJ (1789) 
TT DO yd N NG ORN A. Berger. `` Mesembryanthemem and Portuiacaceeen ” 
(1908). 
IE Vd AR eae of ACs Od EE * Botanical Magazine.” 
D..C., “Plant Grass”....................... A. P. de Candolle, “ Histoire des Plantes Gas ad 
(1799-1829). 
SS RE EE ie oe (. F. Ecklon & K. Zeyher, ` Enumeratie Plantarum 
Africae Australis Extratropicae ” (1834-37). 
RM EO Ae N A. H. Haworth, ** Miscellanea Naturalia ` (1803). 
OE a were weer dc AA A. H. Haworth, “Observations on the _ genus 
Mesembryanthemum,” Part IT (1795). 
N.B.—-Part | was published in 1794, but does 
not contain any descriptions of species, only. 
introductory matter. 
IN Cr RE N n'a SP A. H. Haworth, ‘“ Revisiones Plantarum Succulen- 
tarum ” (1821). 
EE GR EO ee eee GR ER A. H. Haworth, `Supplementarum Plantarum 
Succulentarum ` (1819). 
TR ee PR a er .. A, H. Haworth, “ Synopsis Plantarum Succulentarum ” 
(1812). 
