250 Mr. J. Miers on the genus Dyssochroma. 
DyssocHROMA. 
A recent inquiry into the different species of So/andra, with 
the view of determining the true limits of that genus, has con- 
vinced me that a considerable difference of structure exists be- 
tween Solandra grandiflora and S. viridiflora ; upon comparing 
these carefully, we cannot fail to arrive at the conviction, that 
these two species must be held to be generically distmet. In 
the former mstance, the calyx has the shape of a large and cylin- 
drical tube, irregularly cleft in the mouth into three unequal 
rather short teeth; it does not increase in size, but, im consequence 
of the growth of the fruit, splits on one side, by a longitudinal 
fissure, to the base ; im S. viridiflora, on the contrary, the calyx 
consists of five, very distinct, lanceolate divisions, all free to the 
base, which at first are slightly connivent by their somewhat 
thickened margins, but which are easily, and soon become, sepa- 
rated into distinct sepals. The corolla in Solandra grandiflora is 
much larger, more campanulate, of thicker consistence, of a yel- 
lowish colour, with deep red nervures, and with a border of five 
large rounded lobes, remarkably crenated or fimbriated on their 
margin, and these are considerably imbricated in estivation, one 
lobe being quite interior, and another altogether exterior: the 
stamens are also very glabrous. On the contrary, in S. viridiflora, 
the corolla, of a greenish lurid white, is deeply divided (half-way 
down) into five equal, revolute, lanceolate, acumimated and entire 
segments, which are quite valvate im estivation, and connivent 
by their somewhat inflected tomentose margins: the stamens are 
swollen and very sericeously pilose at their base ; in drying, both 
calyx and corolla become black, which does not occur in the true 
species of Solandra: in the latter genus the flowers are always 
terminal, whereas in S. viridiflora they are solitary and axillary, 
or at least grow out of several nearly terminal axillary fascicles 
of leaves: there are some other minor pots of difference that 
will be traced in the details of the characters described. From 
these facts it will be seen that the new genus, of which the So- 
landra viridiflora may be considered the type, must be referred 
to the true Solanacee, and that it will belong to the Jaborosee, 
serving to connect that tribe with the Jochromee, and closely 
allied to Salpichroma and Nectouzia. I have called it Dysso- 
chroma, from dvcco00s, eager, and ypasua, color, on account of the 
lurid sickly green colour of its large flowers, which become black 
as they wither, or lose their moisture in drying, a character com- 
mon to all the Jaborosee. I have not been able to examine the 
embryo of this genus, but we may expect it will prove very differ- 
ent inform from that of Solandra. The following may be consi- 
dered as its generic character :— 
DyssocHROMA, gen. noy.— Calyx magnus, 5-sepalus, persistens ; 
