80 THE JOURNAL OF BOL'ANY 



S. PUKPUREA L. Ippolyts Brook, below Oakfield, $ ; Ash Brook ; 

 Cadwell Common, d" & $ ; Bm-£ord's Ray ; Charlton Mill Head, d • 



S. Yi:MrNALis L. Ash Brook, near Oakfield, d* & $ ; The 

 Willows, Dog Kennel Farm, $ ; pond near Dye's Farm, Langley, 

 probably planted. For hybrids, see below. 



X S. ACUMINATA Sm., 2 ' Pond on Midland Railway near Ickle- 

 ford, about 20 trees or bushes. "Very fine specimens of S, acuminata 

 Sm." E. F. Linton. A single tree, $ , in a boggy swamp on the 

 right bank of the Hiz, opposite the lower end of Hitchin Sewage 

 Farm. 



S. CAPREA L. Typical bushes or trees in the woods on higher 

 ground ; Wain Wood ; Titmore Green ; Knebworth Great Wood. 

 Those on the lower ground near watercourses more open to suspicion 

 of hybridism with S. cinerea. (f.) androgyna. Yicarsgrove Wood; 

 Rush Green. 



S. caprea X viminaUs (S. moUissima Sm.). (1) J. Pond on 

 right bank of river Hiz, opposite the lower end of Hitchin Sewage 

 Farm. " I think undoubtedly correct " E. F. Linton. (2) $ . Near 

 Great Wymondley (det. W. H. Pearsall) ; pond, Ickleford. "I 

 suppose correct, but am not quite satisfied that S. cajrr(^a is the other 

 parent " E. F. Linton. If my determinations are correct, this is one 

 of our commonest hybrids, and occurs in addition at Gt. Wymondley 

 Springs ; Walsworth, above the footbridge ; watercourse from Letch- 

 worth to Purwell ; hedgerow near the top entrance to Hitchin Sewage 

 Farm. 



S. AURTTA L. The type, (S & 2 > is found in some abundance 

 north of Knebworth Great AVood, and near Dye's Farm, but appears 

 to be absent north of this region. Its place is there taken by 

 >S^. aurita X cinerea. 



S. aurita X caprea $ . Lane between Rush Green and Dye's 

 Farm, Langley. " Yes, a very good intermediate : the aarita 

 bracteoles show very clearly " E. F. Linton. 



8. aurita x cinerea, 1 cT . On the Ash Brook. '' S. aurital X 

 with, I suppose, a strain of S. cinerea in it " E. F. Linton. 2 $ . 

 Pond, halfway between Dye's Farm and Rush Green, Langley. " I 

 agree" E. F. Linton. Burleigh Meadows, Langley. " aS'. aurita X 

 cinerea $ , correct," E. F. Linton. 



S. CINEREA L. Typical. Spring by roadside, halfway between 

 Charlton and Well Head, 6 ; Great Wymondley Springs, $ ; The 

 Willows, $ ; Ippolyts Brook, below Brook End, d ; lane between 

 Grove Mill and Hyde Mill. In two localities, viz., at Oughton Head 

 and in the triangle between the Midland and Great Northern 

 Railways, typical S. cinerea is intermixed with plants having the 

 leaves of 8. cinerea, but suggesting by their glabrescent buds and 

 twigs (sometimes reddish) the hybrid S. aurita X cinerea. 



S. cinerea X viminalis. 6 . Folly Alder Swamp, Hitchin. 

 " Apparently correct : adult leaves desirable " E. F. Linton. Near 

 Sootfield Green, S (with S. cinerea, $ , S. viminalis, d , and 

 S. caprea, $ ). "An interesting form from its brighter green 

 colouring: " E. F. Linton. 



