THE WILLOWS OF OHIO. 289 



seven years I have been continually on the lookout for it but 

 have seen less than half a dozen individuals which were not 

 clearly planted. One of these was on the Hocking River n< 

 Sugar Grove; the others were along the lake shore in Ashtabula 

 count}'. 



In Europe Salix babylonica hybridises freely with 5. fragilis. 

 But in this country the manuals have not included such a cross. 

 A single plant was discovered at Sandusky during the season of 

 1903. * The leaves and habit were so exactly intermediate be- 

 ween the two that there could be no doubt of its identity. 



At Ashtabula was found a plant which from leaf and habit 

 I take to be a hybrid between the present species and Salix alba, 

 which is not reported in the manuals. 



LONGIFOLIAE, THE LONG-LEAVED WILLOWS. 



The longifoliae comprise a very distinct and compact group 

 of American willows. They have no clo nities with any 



other group and do not intermingle with any. They have two 

 stamens (a specimen in the Ohio herbarium has three) and light 

 one-colored deciduous scales which show their relationship with 

 Loth the polyandrous and diandrous willows. Within the group 

 many described species are difncuH nize; Bebb, him- 



self, said after he had describ o or three of them that he did 



not know but what they were all one sp< fter all. The group 



i-, very easily recognized by the venation of the leaves which is 

 different from any other willow and much resembles that of many 



cample the tire weed. There i^ typically a 

 prominent marginal vein running clear round the leaf, connected 

 with the midrib by . of distant nearly straight primaries be- 



en which there are practically n ind no mesh- 



work, onl; -tab running parallel to the primaries. B 



in young leaves the vi i rid at a much sharp< le and 



the marginal vein i prominent while the secondaries and 



tertiarii faded from vi< that the above descrip- 



tion will not hold. The lea 



long and som< narrow that it i^ difficult to find any veins 



11. 



* Ohio Nal 1:13 1 1903 



VI. Salix longipt (left) and s .;/.'> babylot 

 l tens lKiim hree tii 



