1888-89.] Notes on Willoius in University Herbarium. 441 



Hotes on some Willoios in Edinturgh University Herhariiim,. 

 By F. Buchanan White, M.D, F.L.S. 



(Read 11th July 1889.) 



When recently preparing a Revision of the British Willows, 

 I had, through the kindness of Professor Bayley Balfour, an 

 opportunity of thoroughly studying the Salix specimens of 

 the British portion of the University Herbarium. Although 

 willows have, to a great extent, been neglected by British 

 botanists, yet that collection, in whose formation many of the 

 most famous Scottish botanists have taken part, contains, as 

 might be expected, several specimens of great interest, and a 

 few short notes on these may not be unacceptable to the 

 Society. 



In the following paper I have restricted myself to Scottish 

 plants, although there are many others of interest in the 

 Herbarium. Moreover, as the specimens themselves are avail- 

 able for examination, I have thought it unnecessary to give 

 descriptions, since that has been already done in the Revision. 



Sheet 406. — Labelled " Salix fragilis. From a tree near 

 Duddingston. J. Knapp. 1836." This seems to be almost 

 certainly a form of the rare hybrid (unrecorded as British) 

 S. hexandra, Ehrh. (pentandra X fragilis). It bears some 

 resemblance to S. viridis. The leaves are too young, and 

 hence it is desirable that the plant should be rediscovered. 

 It is the only British example of S. hexandra known to me. 



Sheet 418. — >S'. viridis, Fr. (fragilis X alba). Though 

 hitherto confounded with one or other of its parents, >S'. 

 viridis is really common in Britain, There are several other 

 specimens in the Herbarium. 



Sheet 58. — Labelled " S. Caprea"and collected atDunnikier, 

 Fife, by A. H. Gibson. Though the leaves are rather young, 

 this specimen seems referable to S. RcicharcUi, A. Kern. 

 {Gaprea x cinerea), a hybrid difficult to determine, and of which 

 I have seen very few British examples. The Dunnikier plant 

 should be looked for again. 



Sheet 310 (the lower specimens). — In the Student's Flora 

 Sir J. D. Hooker says, under S. Lapponum — " The Edinburgh 

 specimens seen by me are floweiiess ; this locality is ano- 

 malous for so alpine a plant." The specimens on this sheet 



