TREES, SHRUBS AND VINES OF MISSOURI. 359 



19. Hicoria Pecan ( Marsh.) Britton. 



Pecan. A very large valuable tree, more esteemed for its excellent fruit than 

 any other tree in the istate. The most valuable nuts are those grown in the low- 

 land of the southeastern part of the State. It is found along streams in low land, 

 and grows in Bates, Cape Girardeau, Dunklin, Jackson, Livingston, McDonald, 

 Mississippi, Pike, Platte, St. ;Loui8 and Vernon ^counties. This is Carya olivce- 

 formii Nutt. 



LEITNERIA FAMILY (Leitnbriace^). 



20. Leitneria Floridana Chapm. 



Cork- wood-cork-tree. A southern gulf coast species with remarkably light wood. 

 As shown by me in the fifth annual report of the Missouri Botanical garden, this 

 species, in common with others, works its way up the Mississippi river to the 

 southeastern part of the State, to where evidently an arm of the Gulf of Mexico 

 once extended. The wood is the lightest now known, and is used by fishermen 

 for floats, and other purposes which require) a light wood, whence the common 

 liames. It has been found in Butler and Dunklin counties. 



WILLOW FAMILY ( Salicace^). 



21. Popalus alba L. 



White poplar . Commonly planted for ornament, and spreading from the root 

 very much. It has been reported as escaped in Dunklin, Greene, Jackson, Jeffer- 

 son and Newton counties. 



22. Popalus balsamifera L. 



Balsam poplar. Reported from Boone county, but evidently not native there. 



23. Populus grandidentata Michx. 



Large-toothed Aspen. Reported from Boone and Pike counties, but there must 

 be some mistake about this, as I do not think it occurs in the State. 



24.' Populus heterophylla L. 



Downy Poplar. This is the congener of the Bald Cypress, as it is found only in 

 the lowlands of the southeastern part of the State. Not of any economic import- 

 ance, as it does not attain suificient size to cut into lumber. Is found in Bollinger, 

 Butler, Cape Girardeau, Dunklin, Mississippi, New Madrid, Scott, Stoddard and 

 Wayne counties. It was also reported from Miller by Wirick, but there evidently 

 has been a mistake made in the determination of the tree. 



25. Populus monilifera Ait. 



Cottonwood. A very large valuable tree, reaching its greatest development in 

 the southeast part of the State where trees have been cut that were over seven feet 

 in diameter. This and the Sweet Gum are our two loftiest trees, specimens hav- 

 ing been noted that were over 175 feet in height. Occurs abundantly along the 

 Missouri and Mississippi rivers in low bottoms, and common along the smaller 

 streams. Is found in Adair, Andrew, Atchison, Barry, Bollinger, Buchanan, Cape 

 Girardeau, Carroll, Carter, Chariton, Clark, Clay, Daviess, Dunklir, Scott, Jack- 

 son, Jasper, Jefferson, Linn, Madison, McDonald, Mississippi, New Madrid, New- 

 ton, Platte, Ray, Scotland, Scott, St. Louis, Stoddard, Washington, Wayne and 

 Wright counties. 



