18 SALIC ACEAE 



OREODOXA. Royal Palms. 



Evergreen unarmed trees with clean columnar trunks; 

 large seemingly pinnate alternate leaves; and moderately 

 large panicles of small monoecious flowers 1 and fruit from a 

 large boat-like leathery spathe. 



Trunk commonly swollen in the middle. (Royal palm). O.regia. 

 Trunk not swollen. (Cabbage palm). O. oleracea. 



Class DICOTYLEDONEAE. "Exogens." 



Family SALICACEAE. Willow Family. 

 A small family of deciduous trees and shrubs, chiefly of 

 temperate or cold regions, yielding the "osiers" used in basket- 

 ry and some lumber of inferior quality. Some of the poplars 

 greatly abused in street planting, and infested by scale insects 

 that spread to more valuable trees and shrubs. 



POPULUS. Poplar. Aspen. 



Deciduous trees, often very rough-barked when old, with 

 rather soft white or browning wood with minute scattered 

 ducts and very fine medullary rays; moderate rounded or acute- 

 ly 5-angled twigs; 5-angled continuous or spongy brown pith; 

 somewhat raised rather 3-lobed large leaf-scars with 3 large 

 bundle-traces; narrow stipule-scars; large buds, the terminal 

 angularly ovoid, the lateral often falcately spreading, with 

 sieveral scales of which the lowermost is in front, immediately 

 over the leaf-scar; small dioecious naked flowers in catkins; 

 and small ovoid capsules with numerous cottony seeds. 



1. Buds plump, or else not resinous or gummy. 2. 

 Buds elongated, more or less balsamiferous. 9. 



2. Leaves white- or gray-woolly beneath: petioles 



little flattened. (White poplars). 3. 

 Leaves not woolly: petioles much flattened. (Aspens). 6. 



3. Leaves gray beneath. , P. canescens. 

 Leaves white beneath. 4. 



4. Tree rounded or oblong. 5. 



Tree pyramidal: leaves lobed. P. alba Bolleana. 



