THIRSK BOTANICAL EXCHANGE CLUB. 19 
rubrum, and not the true C. botryoides of the south-eastern coast. C. 
urbicum and its variety intermedium are both included by name in the 
‘Flora of Surrey. The specimens now sent will show what forms 
were included under those two names. As no greater differences ap- 
pear between these two forms than are found between varieties of C. 
album or of C. rubrum, it seems proper to look upon them also as one 
single species. Perhaps all of them would be assigned to C. inter- 
medium only by Continental botanists, and if so, it may be held very 
doubtful whether the typical C. wrbicum has ever really occurred in 
England. Branches from two or three large plants of C. glaucum, 
found in Guernsey, are introduced into some of the packets, because 
this is a very scarce species, and some mistakes and misnomers of 
it occur in works on British botany. The two dozen packets are 
numbered consecutively, but only about one-half of them contain a full 
series of the species and varieties.” 
Salix viridis? Mr. Watson sends a set of specimens in leaf thus 
labelled, with which he writes: ** Salix viridis ? is sent for distribution, 
in order to draw attention to the species of Fries, which has been stated 
to occur in different counties of England, on faith of specimens seen 
and named by Dr. Anderson, author of the ‘Salices Lapponie.’ Of 
course, it cannot be quite certain that Dr. Anderson would have like- 
wise so named the examples now sent, but they do closely resemble 
some of the specimens from Surrey, which he named 5. viridis.” 
S. viridis is stated by Fries* to be characterized by diandrous male 
flowers, * arrect ' entkina with leafy stalks, concolorous deciduous 
seales, lanceolate-acuminate leaves, which are perfectly glabrous on 
th sides even when quite young and tough, erect branches. Fries 
seems to consider it as nearest to S. fragilis, but tending towards 
triandra in the habit of the catkins, and alba by the toughness of the 
branches; but a specimen from Mr. Watson gathered by Nyman, heer 
Stockholm, has the young leaves decidedly silky, so that it would T 
pear doubtful whether one of the characteristics mainly relied upon is 
absolute. In this example, the flowers of which are taken from the 
staminate plant when very young, the leaves in shape and runs 
resemble those of fragilis, the peduncles being densely silky, and te 
scales not not more than j inch long, silky, narrowly obovate and 
* ‘Summa Vegetabilium, p. 204. 
