330 ON RUBUS RAMOSUS. 



to know whether this discrepancy has been noticed by otlier observers in 

 this or in other species. In E. Centanrium and its subspecies the stamens 

 have a very peculiar habit of not surrounding the pistil, bnt, when they 

 are discharging their pollen, the anthers being all collected together on 

 one side of the stigmas. In Sjnr<2a FlUpendida the stamens themselves 

 are so arranged as to favour cross-fertilization. The outer rows of sta- 

 mens are matured first, and while they are discharging their pollen, tlie 

 inner immature stamens are folded up into a kind of cap, completely 

 covering up the stigma and preventing the access of pollen. 



The following comprises all the additions I am able to make this year 

 to the three lists : — 



Protandrous. Synacmic. Protogynous. 



Silene maritima. Hj^ericum pulchrum. Lonicera Periclymenum. 



Spiiaua Filipendula. Galium palustre. Plaatago maritima. 



Hedera Helix. Hieracium umbellatum. 



Centaurea nigra. Convolvidus sepium. 



Sen'atula tinctoria. Veronica Chamaidrys. 



Solidago Virgaurea. Prunella vulgaris. 



Jasione montana Galeopsis Tetrah.it. 



Melampyrum pratense. 



Lysimachia nemorum. 



In many Composifce belonging to the suborder TubnUflorere, the anthers 

 belonging to the perfect bisexual flowers of the disk, while protandrous as 

 respects their own pistil, are developed at the same time as the stigmas of 

 the female flowers of the ray. 



I do not know wdiether it may have been noticed that in several 

 species of Couvolviihice't the stamens are normally of unequal lengths, as 

 if indicating a structural approximation to the didynamous Orders Lahiatee 

 or Scropludarinere . Jn Convolvulus arvensis the filaments appear to be 

 never quite ecpial in length. I almost invariably find two longer than the 

 other three ; the anthers of one of the longest frequently resting on the fork 

 of the mature bifid stigma at the time that it is dischargnig its pollen. In 

 C. sepium the filaments are usually of precisely the same length ; but in 

 C. tricolor, L. (C. minor, Hort.), and Pharbitis Jdspida, Chois. (^Convolvulus 

 major, Hort.), the inecpiality -is quite as strongly marked. As is likely to 

 occur in cultivated plants, the variation is in these cases subject to greater 

 irregularity. In the former species I have sometimes noticed the diffe- 

 rence in length to be quite as great as in most didynamous plants; in 

 the latter species there appear often to be three distinct lengths, viz. two 

 long, one medium, and two short. 



ON RUBUS RAMOSUS, Blox., AN UNDESCRIBED SPECIES 

 OF THE NUDICAULIS GROUP. 



By T. R. Archer Briggs. 



Through the kindness of Mr. J. G. Baker, I have recently had the 

 opportunity of comparing many of our Plymouth Rubi with named 

 examples of foreign specimens in his herbarium from Genevier, Mercier, 

 Wirtgen, and other Continental students of the genus. One comparison 

 that I have made has been between tlie Schlickund of Wirtijen and a 



