REPORT OF THE WATSON BOTANICAL EXCHANGE CLUB 309 



Lyndhurst, De Freville Avenue, Cambridge. We do not know 

 whether the Eeports are on sale ; if so, it would be convenient if 

 this were stated on the wrapper : the exact date of publication 

 should also appear somewhere. 



In accordance with our usual practice, departed from last year 

 owing to exigency of space, we give a few extracts relating to 

 individual species, which will, we think, interest our readers : in 

 those on Polygonum of the Avicularia group Dr. Moss incidentally 

 records a species new to the British Flora. 



We note with interest that certain suggestions which we 

 ventured to make when noticing the Eeport for 1909-10 (Journ. 

 Bot. 1911, 68) have been adopted — we think (naturally) to the 

 benefit of the Eeport. 



Prunus domestica L. Undercliff, Portishead, N. Somerset, 

 v.-c. 6, April 18 and July 1, 1911. This is an undoubtedly native 

 locality for the wild plum. It occurs in abundance, which is 

 unusual where there are no suspicious circumstances about the 

 position. — Ida M. Eoper. The characters of this specimen do 

 not seem to fit our normal P. domestica at all well in some 

 respects, so far as books go, though of course one ought to see 

 the ripe fruit. My herbarium examples of P. domestica have a 

 smooth and more or less shining bark, very unlike the dull, pube- 

 scent twigs of this Portishead plant. — E. S. M. The plum trees at 

 Portishead have for many years been under observation by Mr. 

 David Fry and myself, and the late Eev. Augustin Ley agreed 

 with us that they afforded as good an illustration of native 

 P. domestica as was likely to be met with. They are trees, are not 

 spinous, the flowers and fruit are larger than those of the bullace, 

 and the fruit is of a different shape. Still, Mr. Marshall's criticism 

 is quite just, and it is to be feared that satisfactory typical speci- 

 mens of the various forms in this aggregate must be rare. With- 

 out doubt there exists a long series of intermediates that connect 

 our plum, bullace, and sloe as described in books. This is well 

 shown by Eouy and Foucaud in their Flore de France, where 

 sixty or seventy named segregates in this group are mentioned ! — 

 J. W. W [hite] . 



Erica cinerea L. forma. Carnon Croft, near Truro, W. Corn- 

 wall, v.-c. 1, Sept. 2, 1911. A striking form with long and densely 

 flowered racemes. It was seen in situ by members of the Phyto- 

 geographical Excursion, all of whom considered it deserving a 

 name. I have seen it in other parts of the county, but nowhere 

 so fine as at Carnon Croft, where it has the company of E. ciliaris 

 and E. ciliaris x Tetralix. — F. H. Davey. A beautiful form 

 with crowded whorls and much exserted styles, but I think only 

 a form. — E. F. L. A very beautiful form, which, if it keeps con- 

 stant, should deserve a distinguishing name. — C. E. S. This 

 striking form is characteristic of the mild, moist districts of South- 

 western England and Western Ireland. It is abundant, for 

 example, in Connemara. In the drier Eastern England the form 

 of E. cinerea is very insignificant compared with this, but I do not 



