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REVISION' OF THE 15RTTISH WILLOWS. 399 



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one. From Smith's specimens, and from the drawings, the com- 

 bined filaments of 8alix Croweana form acute angles, and hence 

 are not strictly cladostemmic as that term is defined by Wimmer. 

 From, however, the further abnormal development (as described 

 and figured by Forbes, t. 52, and shown by specimens published 

 by Leefe and Ward), when the stamens become changed into 

 imperfect ovaries, it seems probable that, as Borrer thought, the 

 connate filaments of Smith's Croweana were " but an accidental 

 monstrosity." As such most of the specimens named Croweana 

 must be considered, though some plants so called are phylicifolia 

 without any deformity. Besides these, however, I have seen 

 specimens of two plants which have been referred to Croweana, 

 but which apparently derive their connate filaments from the 

 hybridization of phylicifolia with purpurea. Since, however, 

 these specimens are imperfect — having no mature leaves — and 

 are, besides, not of certain British origin, it is unnecessary to say 

 more about them on the present occasion. 



S. Dicksoniana. — According to Leefe, the original Dicksoniana, 

 the plant described by Smith, " must be regarded as at present 

 unknown." Leefe refers his published specimens (Sal Exs. i. 

 No. 12) " received from Mr. Borrer as from Smith" to & Dick- 

 soniana, Forbes, t. 55. fig. 1, which they seem to be. Forbes him- 

 self had doubts as to his plant being the same as Smith's, but 

 apparently was not satisfied that it was distinct. Forbes's figure 

 has been sometimes referred to 8. nigricans, to which it has some 

 resemblance in the leaves ; but "Wimmer points out its likeness to 

 plants intermediate between 8. nigricans and 8. livida. Andersson 

 «tes Eng. Bot. 1. 1390 under 8. phylicifolia, but does not mention 

 8al W °b- 1. 55, except amongst the synonyms. All the speci- 

 mens I have seen are cultivated ones, and probably from Borrer's 

 P la nt. It is much to be desired that the form could be redis- 

 covered in a wild state. In the meantime, judging from the cul- 

 tivated examples, I strongly suspect that 8. Dicksoniana is a 

 h )brid between S. phylicifolia and 8. Arbuscula, since in its cha- 



nC m- S ** iS alraost intermediate between the two. 



Wimmer does not distinguish by name any varieties of S.phyli- 



"folia, but Andersson, in the « Prodromus,' meutions two, which in 



»e ' Monographia ' are treated as subspecies. These are S. Heget- 



*chu,eil eri) Heer, supposed by Wimmer to be a hybrid of S.phyli- 



ci folia and 8. hastata, and 8. rhcetica, Kern., which is described as 





°f 8. phylicifolia approaching S. Arbuscula. 





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