MIDDLESEX FLOEA. 95 



S. sericea. Marsh. Silky Willow. 



Medford (G. E. Davenport) ; Arlington (Wm. Boott) ; Hopkinton 



(L. L. Dame). Not common. May. 

 S. petiolaris. Smith. Petioled Willow. 



Medford (G. E. Davenport) ; Winchester (L. L. Dame) ; Cambridge 



(L. H. Bailey, Jr.), et al. Apr.-May. 

 S. PUEPTJREA, L. Pdkple Willow. 



Arlington (Wm. Boott); Medford (L. L. Dame). Apr.-May. A 



native of the Old World, sparingly naturalized. 

 S. viminalis, L. Basket Osier. 



West Medford (C. E. Perkins). Adv. from Eu. May. 

 . S. cordata, Muhl. Heabt-leaved Willow. 



Widely distributed, but not common. Apr.-May. 

 S. cordata X sericea, Bebb. ("S. myiicoides, Muhl. ! notthe S. 



cordata, var. myricoides, of Gray, Man.") — M. S. Bebb. 



Near Fresh Pond, Cambridge (L. H. Bailey, Jr.) 

 S. rostrata, Eich. (S. livida, Wahl., var. occideutalis. Gray.) 



Livid Willow. 



Common. Apr.-May. Mr. Bebb ranks this willow as a sub-species 



of S. livida. 

 S. lucida, Muhl. Shining Willow^ 



Rather common. May. 

 S. nigra. Marsh. Black Willow. 



Cambridge, Medford, Winchester, et al. Occasional. 

 S. nigra. Marsh, var. falcata. Gray. 



Cambridge (Dr. C. W. Swan) ; Concord (Walter Deane) . 

 S. EEAGiLis, L. Brittle Willow. 



Hybrids in which S. fragilis predominates are not uncommon; a 



Medford specimen Mr. Bebb pronounces " almost pure fragilis.''^ 



May. 

 S. ALBA, L., var. vitellina, Koch. 



Chelmsford, Medford, Natick, et al. Not uncommon. May. 



" The typical S. alba is extremely rare in the United States, and 



what Anderson, Wimraer, and the German botanists generally 



regard as genuine S. fragilis I have not seen at all ; but the var. 



vitellina is very common, as are also a host of hybrid forms between 



alba and fragilis, representing S. viridis, Fr., S. Eusselliana, Sm., 



&c. These hybrids, perplexing enough in themselves, are rendered 



stUl more inextricable, with us, by a further cross — by no means 



rare — with native lucida," — M. S. Bebb. 



S. myrtilloides, L. Myrtle Willow. 

 Cambridge, Behnont, Wakefield, Chelmsford, et al. Rather common. 

 May. 



