34B that villi also be figured; yet under cultivation the leaves grad- 

 ually pass from the simple ovate form into the other forms, w'ith 

 reference to the names of these plant ^ would again repeat that 

 where determinations are made b^' means of the very fine figures of 

 Salra ^rck's work on Ivies embryanthemum and the erroneous names he has 

 applied to those figures — accepted as being correct without inves- 

 tigation (as all monographers have hiterto accepted them), confused 

 nomenclature will certainly be maintained. 



As the synonymy of this genus is exceddingly complicated I 

 give at the end a synonymic index for the purpose of reference. 



In the diagrammatic illustration of the generic structure 

 (given on p. 290) the top of the ovary is represented as but very 

 sligh l^-- depressed at the centre, ^^e amount of depression, how- 

 ever, vnries with the species, for in some species the stigmas are 

 inserted at the "bottom of a deep, cup-like depression in the top 

 of the ovary. 



Most of not all of the species of this genus are very minute- 

 ly ciliate on the edges and keel of the young leaves, a character 

 so corjnon that of the young leaves, a character so common that I 

 have not mentioned it in all the descriptions. The epidermis of 

 the leaves of many species has a somewhat remarkable surface. To 

 the naked eye and to the touch the leaf seems to be very smooth and 

 is often shining, but if examined vdth a strong pocket-lens, with 

 light falling upon it in a certain v;ay, the surface-oell (or many 

 of them) v.'ill be found to be raised and linear or oblong end arran- 

 ged it in rows transverse to the leaf. ^n some species, however, 

 such as in G. linguiforme, the surface-cells are not at all raised 

 in that v^ay, but are even ell over the surface. I am aware that this 

 does not give full detail of the surface -cell structure, but it v.dll 

 surfice to make my meaning clear to the average cultivator armed 

 only with an ordinary pocket-lens. 



Several species in an adult state have their growths pressed 

 upon the ground, with the leaves edgeways to the sky, but in the 

 younger stages, or v/hen not fully exposed to the sun in the open 

 air, the leaves are generally more or less ascending so that tiiis 

 character cannot be relied upon as being always of specific value. 



In my former account of this genus I gave the date of Hav7orth*s 

 Observations on the Genus i^esembryanthemum as being 1794; that is 

 the date on the title-pege, but I find that the book was issued in 

 two parts, the second part, which contains all the descriptions, 

 being dated 1795, as hereafter quoted, 



KEY TO THS SPECIES. 



This key to this very difficult genus is the best I have been 

 able to construct from the material available, and may not always 

 prove satisfactory, as I find that the same plant sometimes varies 

 considerably from year to year, and I have not been able to provide 

 for all variations, as some species are very versatile; but would 

 here not that the hook at the end of the leaf is sometimes absent 

 from leaves of species that normally possess it, and the pustule at 

 the base of the leaves of certain species sometimes disappears from 

 starved nlants; end also in some species the leaves may now be in 

 two ranks, end at another time the pairs obliquely cross one another. 



1. Flov/ers with distinct pedicels 1/4-2-^ inches long, 2 



Flov/ers sessile or subsessile, i.e., v/ith pedicels not 

 rising above the leef-sheaths or not more than 1-2 



