64 
connected with other characters that they appear to form an 
essential part of the specific constitution of the species. Unfor- 
tunately the number of pieces of most of the species under 
observation is very small, nor was there any living material 
available, for it seems that these pretty plants are difficult to 
cultivate. 
The range within which the characters used for discrimination 
actually vary, and consequently their reliability and ultimately 
perhaps even the claim of some of the units recognised to the 
status of species remain therefore open questions. Observations 
in the field and cultivation both have to be called in aid to answer 
them. Meanwhile, an adequate description of the members 
of the group and a clear disposition of their distinctive characters 
will not only prepare a sound foundation for such field and 
experimental work, but also serve for the immediate practical 
need of a ready means for determining Tropaeolums of the 
serrato-ciliata group. With this end in view I asked Miss 
Hughes to prepare, under my supervision, the revision which 
forms the subject of the present paper. 
QO. Starr. 
Key TO THE SPECIES. 
*Blades pruinose papillose below, or 
if epapillose then without red dots or 
mottlin 
Stipules leafy, conspicuous, persist- 
ent, nemniarbiquine, 1 cm. in RO 
meter 1. Matthewsii, 
Stipules ineonapiauous, pach Mens or 
wantin, 
+Blades glaucous and_ pruinose 
papillose below : 
Blades hairy on both sides, 
rotundate ovate and _ bluntly 
5-lobed to subentire : 
Flowers 2-2-5 cm. long, hairy 2. pubescens. 
Flowers he 5-4-5 em. long, 
glabrous 
Potiole stout, shorter than 
the blades which are densely 
white-papillose below ; flow- 
ers 3-5em. long - - 3. papillosum,. 
Petiole filiform, stout at . 
the base, longer than the 
blades which are greyish- 
pruinose below; flowers 
4-5 em. long - - 4, hirtifoliwm. 
