S6 THE JOUKXAL 01' EOTA^T 



and in two or three minor, but apparently unvarying, features ; at a 

 glance the larger pure- white tiowers of ololeucos conti-ast strongly 

 with the small yellow-based petals of f?'iparfitus, whilst upon a closer 

 examination Lloyd's plant will be found to have more numerous 

 carpels in each head with beaks of decidedly a greater length. 



The plant we used to call the variety infenftedius of frijjartifus, 

 which now bears the name lufarins Bouvet, lacks the trtdy capillary, 

 extremely tine submerged leaves of ololevcos and fripartitus and 

 diifers in having the floating leaves less deeply divided, with the 

 segments broader and more rounded. 



R. ololeucos has been found in France, both in the Western 

 portion (where Lloyd obtained his original examples) and in Nor- 

 mandy, also in Scandinavia, Denmark, Germany, Holland and 

 Belgium ; it is thus quite possibl3^ an overlooked inhabitant of East 

 Anglia or Southern England. 



Ceeastium bkaciitpetalvm Desp. 



This has a very wide distribution which includes the greater 

 part of Europe, where it is found in Denmark, Sweden, Germany, 

 France and Belgium. 



Its nearest British ally is G. glomeratum^ of which the form Houy 

 has called subvar. elongatum has a somewhat similar habit. From 

 this, however, C. hrachypetalum differs in various minute though 

 constant particulars, the most important being the long hairs on the 

 filaments, the long fruiting-pedicels and their remarkable curving at 

 the summit. This last feature recalls the somewhat similar behaviour 

 of the pedicels in C. pumihim. 



From C triviale^ of which perhaps rather than C. f/lomerahim, it 

 has more the general facies at first glance, C. hraclii/petalum abun- 

 dantly differs in being an annual and in having its bracts wholly 

 herbaceous with no scarious margin, as well as by the characters 

 already mentioned. 



Alsine dunexsis Corbiere. 



This occurs on the dunes and in sand}^ places on the coast of 

 Normandy, and will probably be found in the Channel Islands in 

 similar situations. It should be looked for quite early in the year, 

 as I have specimens gathered by Corbiere on May 31st possessing 

 capsules which have alread}^ shed their seeds. It may be distin- 

 guished from A. tenuifoUa, to which it is closely allied, by its 

 extremely upright strict habit with the top of pedicel and calyx 

 glandular-hairy, but above all, by its corymbiform and dense cymes 

 of tiowers with short pedicels which, do not lengthen in fruit, and by 

 its short capsule. 



Prof. Corbiere satisfied himself that his ])lant was neither 

 A. hyhrida Jordan (which is also glandular-hairy) nor A. viscosa 

 Schreb., whilst A. laxa Joi'dan was out of the question owing to its 

 very different habit. 



Rouy and Foucaud (Fl. Fr. iii. 279, l.S9()j i)lace Corbiere's plant 

 as a dwarf variety under A. conferta Jordan, and note that the 

 habitat (Northern France) of the variety is interesting as A. conferta 

 seems confined to the Southern reuions of that country. 



