CYRTANDREÆ (AUOT. C. B. CLARKE). 11 
cies, or merely varieties. In such cases, I have left the plants as two 
species, judging this the more convenient as well as the more safe 
course. But in other cases, as of the Himalayan Aeschynanthus and 
Didymocarpus, where I have been able to observe numerous living 
wild specimens for a series of years, I have not hesitated to alter the 
work of my predecessors considerably. My. aim being to make a 
useful reduction of the Cyrtandreæ, I have employed, as much as 
possible, obvious characters, and have avoided characters requiring 
high magnification or prolonged preparations. 
The form of this Monograph is made to conform in general to 
that of the series of DC. Monographs among which it stands; but I 
have made two considerable and unusual additions, which are prac- 
ticable in this partieular Tribe, though in few others. 
1° I have endeavoured to quote the whole of the botanie litera- 
ture extant; I have not been able quite to exhaust the gardeners’ 
names and books. Some of the citations may appear entirely vain; 
the empty copying of copiers who never saw the plant in hand. But, 
in this Tribe, the literature is so limited that this complete formal 
citation cannot add more than half a dozen pages of printing; and, 
as | had made a complete reduction of the text-books, I have been 
advised to print it. 
2° [ have endeavoured to cite the whole of the material extant 
in the Herbaria examined, with in each case the name of the Herba- 
rium as well as the number (if any) on the plant; except in the case 
of a very few common species. This complete citation would be 
quite impossible in most Orders; in the present Tribe it involves 
perhaps five or six extra pages of printing. This makes the present 
paper an Index of Cyrtandreæ for the Herbaria seen; and should 
save the next man who overhauls the Tribe all trouble in discovering 
the species intended. 
S 7. PERMANENT COTYLEDONS. 
Several species of Streptocarpus commonly cultivated are well 
