BOTANICAL EXCHANGE CLUB. 
15 
late T. W. Gissing — a Wakefield botanist — under the name of 
Aremonia a<jrimoni<)ides, as ‘ pretty abundant by the canal running 
from Stanley to the Calder.’ Now, in 1878, this humble alien 
weed offers an example of perfectly successful colonisation only 
paralleled by Anacharis or Inipatiens fulra. It was probably 
originally introduced with baulks or props of Norway pine used 
about the canal locks or in adjoining coal-pits, but it has now 
become as ineradicable as the indigenous weeds to be found with it 
by the towing-paths where it occurs, and in future editions of our 
descriptive manuals deserves a place much more than many other 
species of less recent introduction. It is a most prolific seeder, 
and the seeds germinate wherever they fall, apparently whether 
fully ripened on the parent plant or not.” 
Piosa involuta. A variety with naked peduncles and calyx-tube, 
nearly simple leaf- serration and leaves hairy only on the ribs 
beneath, from Apes Tor, Alstonfield, Stafford, Kev. W. H. Purchas. 
A. sejdam. One of the most valuable contributions this year is 
a good supply of this species from a hedge near Puttenbam, in 
Surrey, from Messrs. H. & J. Groves. This for the first time 
settles it down firmly as an English plant. I got it near Hind 
Head many years ago, but saw only a couple of bushes. So far as 
I know it has never been seen in Warwickshire since Mr. Bree 
gathered it a generation ago. 
11. asjjeniata, Hesegl. Trusham, Kev. Wm. Rogers ; Wood- 
lands, near St. Budeaux, S. Devon, T. K. A. Briggs. 
R. latehrosa, Desegl. Solihull, Warwick, J. Bagnall ; and 
Tamerton Foliott, S. Devon, T. R. A. Briggs. This and the 
last came under R. verticillacantha, as understood in my mono- 
graph. 
R. Borreri. Tettenhall, Warwick, Dr. Fraser. 
R. tumentella. Gayton and Rothershope, Northamptonshu’e, 
G. C. Druce. 
R. ohtnsifoJia. Barnes Common, Surrey, G. Nicholson ; Chud- 
ley, S. Devon, Rev. Wm. Rogers ; and Sellack and King’s Capel, 
Hereford, Rev. A. Ley. 
R. coriifolia. Glen Lochay, Perth, Rev. E. F. Linton ; and 
High Ridge Fall, Roxburghshire, A. Brotherston. 
R. Watsoni. Edenmouth, Roxburghshire, A. Brotherston. 
Peduncles sometiuies setose. 
R. irnplexa. Hedge near Shepperton, Surrey, H. & J. Groves. 
R. siu-culosa. Ham Common, Surrey, G. Nicholson. A form 
with globose fruit, like luxuriant spJucrica. 
R. hiserrata. Trusham, S. Devon, Rev. Wm. Rogers. 
R. Bakeri. Hedge near Old Park, Warwick, H. Bromwuch ; and 
Holgate, York, G. Webster. 
R. airatsis, var. puhescens, Desv. Ham Common, Surrey, G. 
Nicholson. 
Rubus mucromdatus. Mr. G. Nicholson sends, from the neigh 
bourhood of Kew, specimens of a London bramble which is 
regarded by Babington as a variety of unicromdatns, a stronger- 
growing plant than the type, with many setin on the barren stem, 
