JUGLANDACEAE 21 



lobed leaves with golden glands beneath; small naked imper- 

 fect flowers in short catkins; and small rounded aggregates of 

 dry fruits often very waxen. 



1. Leaves elongated, deeply lobed. (Sweetfern). M. asplenifolia. 

 Leaves short, toothed toward the end or entire. 2. 



2. Leaves much narrowed at base: low shrub. 3. 

 Leaves oblanceolate. 4. 



3. Leaves pubescent beneath. M. Gale. 

 Leaves glabrate. M. Gale subglabra. 



4. Leaves characteristically obtuse: shrubby. M. carolinensis. 

 Leaves acute: rather tree-like. M. cerifera. 



Family LEITNERIACEAE. Corkwood Family. 

 A family consisting of only the following genus with a 

 single species of no decorative value but sometimes 1 grown as 

 a curiosity because of its extremely light wood. 



LEITNERIA. Corkwood. 



Deciduous little-branched swamp shrubs with rather stout 

 terete twigs;; very light pale wood with moderate ducts in 

 short subtangential series and very fine medullary rays; 

 rounded continuous white pith; alternate little raised half- 

 elliptical or triangular leaf-scars with 3 bundle-traces; no 

 stipule-scars 1 ; ovoid sessile buds with several exposed scales; 

 moderate entire petioled leaves; dioecious apetalous flowers in 

 catkins; and dry drupe-like wrinkled fruit. 

 Leaves lance-elliptical, hairy beneath. L. floridana. 



Family JUGLANDACEAE. Walnut Family. 

 A small widespread family furnishing most of the nuts of 

 commerce and the important hard woods hickory and walnut; 

 sometimes planted for shade trees. 



JUGLANS. Walnut. Butternut. 



Deciduous mostly large trees with brown wood with mod- 

 erate fairly uniform diffused ducts and fine medullary rays 

 with tangential bands of wood parenchyma; stout roundish 

 twigs 1 ; rather heart-shaped triangular or 3-lobed large leaf- 



