360 STATE HORTICULTURAL SOCIETY. 



26. Populus tremuloides Michx. 



Trembling Aspen. A small tree of no economic value, occurring in the north- 

 eastern part of the State. The peculiar trembling motion of the leaves has given 

 rise to its popular name. Has been found in Adair, Clark and Sullivan counties; 

 also reported from Franklin county by Swallow, but thiB must have been an error 

 in determination. 



27. Salix alba L. 



White willow. Commonly planted for ornament, and reported as having escaped 

 in the State, by Tracy. 



28. Salix alba vitellina ( L.) Koch. 



Osier willow. Like the last, is commonly planted, and has been observed in 

 Jackson, growing along branches. 



29. Salix ainygdaloides Anders. 



Almond willow. A large tree growing in bottoms along the Missouri and 

 Mississippi rivers. It has been found in Andrew, Atchison, Cape Girardeau, 

 Clark, Clay, Holt, Jackson, Platte, Scotland and Stoddard counties. 



30. Salix Babylonica L. 



Weeping willow. Commonly planted for ornament, and has escaped from culti- 

 vation in Jackson county. 



31. Salix Candida Flugge. 



Hoary willow. Has been reported from Iron and Pike counties, but I have 

 never seen it in the State. 



32. Salix cordata Mnhl. 



Heart-leaved willow. A small shrubby tree along branches. Occurs in Howell, 

 Jackson, Shannon and St. Louis counties. 



33. Salix cordata vestita Anders. 



Diamond willow. A larger tree than the last, with very hard wood, which is 

 quite durable, aDd called Black willow by farmers, a name which properly belongs 

 to Salix nigra. The tree is confined to the rich alluvial bottoms along the Missouri 

 river, and appears quite distinct from the last. It has been found in Andrew, 

 Atchison, Clay, Holt, Jackson, Platte, Scotland and St. Louis counties. 



34. Salix discolor Muhl. 



Glaucous willow. Has been collected in Clark and Pike counties only. 



35. Salix fragilis L. 



Crack willow. Reported as collected in Pike county by Pech, but this is 

 probably a mistake. 



36. Salix humilis Marsh. 



Prairie willow. A very common bushy willow on the prairies, and becoming 

 a small tree in Jackson county along small streams. It is found in Atchison, 

 Boone, Carter, Christian, Clark, Greene,' Howell, Jackson, Lawrence, McDon- 

 ald, Newton, Shannon, Warren, Wayne, Webster and Wright counties. The 

 arborescent form was mistaken for Salix petiolaris in my Flora of Jackson county, 

 Missouri. 



