THE SALTX LISTS IN THE 'LONDON CATALOGUE.' 463 



of the former, and the two must go together. It afterwards came 

 under my notice that Wimmer had remarke 1 the similarity, saying 

 (S(tl. Eur. p. 35) the two were so Hke in their inflorescence that 

 they coukl not be separated, adding that in the fertile soil of West 

 Bothnia S. Lappomun formed osier-like shoots. If S. Lappa intuihsbdi 

 stood next to iS'. viminaUs in the list, changing places with S. Janata, 

 there would have been little objection to this arrangement ; but 

 since S. viminaUs has so many hybrids with the Capreas, which are 

 mostly conveniently arranged under this species (see Explanations 

 of the London Catalogue, ed. 9), this group fits in best in a linear 

 arx'augement just before the Caprea^, as in former editions of the 

 London Catalogue; the '^ Sniithiana'" hybrids forming a succession of 

 connecting links, which is hardly broken by the insertion of S. 

 Lapponnm : for, as Wimmer observes (I.e.), this species undoubtedly 

 shows the transition from S. viminaUs to the cinerca group. 



S. purpurea and its hybrids are placed by Andersson at the end 

 of the list, in pursuance of his division of the Salices into the 

 three tribes, Pleiandnv, DiandrcB, and Synandrcc. The union of the 

 two filaments, in whole or in part, is the main character of the 

 SijnandrtP, which include two groups, Incancc and Purpurea;. The 

 objection to the arrangement by which these two groups terminate 

 the list is that a sudden jump is made from a series of dwarf alpine 

 willows to some lowland species that have no apparent connection 

 with them. This objection is easily removed. The Si/nandra; only 

 difl'er from the Diandne by the connation of the filaments. Place 

 the SynandrcB at the beginning instead of the end of the Diandrm ; 

 let the IncaneB (not represented in Britain) follow and not precede 

 the Purpurea;, and they form a natural passage from the Purpurea; 

 to the Viminales, which S. inc.ana Schrank greatly resembles in 

 foliage. The S. purpurea hybrids also fall into a natural position, 

 and lead on to the Viminales and Capre^, to a union with which 

 they most of them owe their existence. Then the very distinct 

 willow, S. reticulata L., which Keruer at one time thought worthy 

 of generic distinction, forms (with its immediate allies from Lap- 

 land and N. America) a fitting termination to the list. 



Andersson's classification is open also to some other objections 

 (see Dr. White's criticisms for instance, Journ. Linn. Sac. xxvii. 

 337), which, however, are in great part due to the inherent diffi- 

 culties of the genus ; but it is on the whole the best arrangement 

 published, subject to some such changes as I have suggested above 

 and carried out in my list. 



My further remarks will follow the order of the list embodied in 

 the Catalof/ue, for the convenience of quoting the Catalogue numbers. 



1395 triandra Linn. All three hybrids need a query as to their 

 parentage. S. suhdola F. B. W. is assigned to triandra x alha with 

 much hesitation in the Revision, and it is frankly admitted that the 

 only bush known may be a form of S. viridis Fr. The name 

 suhdola, too, can hardly stand for S. alba x triandra ; Wimmer 

 declares S. undulata Ehrh. to be a hybrid of 5. triandra {lud S. alba, 

 though he had fully considered and rejected the triandra x viminaUs 

 theory [Sal. Eur. 145) ; and the only objection to Wimraer's theory 



