80 TREES AND SHRUBS. 



from the Arboretum Segrezianum as Pterocarya stenoptera ; they are now about 12 metres high and have proved to be 

 much hardier and more satisfactory than either of their supposed parents. In the most severe winters the trees in the 

 Arboretum have suffered only slightly, while Pterocarya stenoptera is much injured every winter even in the most 

 favorable situations, and young plants of Pterocarya fraxinifolia are quite tender. Pterocarya Eehderiana may there- 

 fore be planted in regions where the other Pterocaryas are liable to suffer in winter, It can be easily propagated by 

 suckers, which spring up in large numbers from the roots of the old trees. 



Alfred Rbhdeb. 

 Arnold Arboretum. 



EXPLANATION OF THE PLATE. 

 Plate CXXXVII. Pterocarya Eehderiana. 



1. A flowering branch, natural size. 



2. A staminate flower, side view, enlarged. 



3. A staminate flower with undeveloped lateral sepals, se 



from above, enlarged. 



4. A staminate flower with lateral sepals developed, see 



from below, the stamens removed, enlarged. 



5. A pistillate flower, anterior view, enlarged. 



6. A pistillate flower, posterior view, enlarged. 



7. A pistillate flower with the bracts removed, enlarged. 



8. A pistil, enlarged. 



9. A fruiting raceme, natural size. 



10. A fruit, natural size. 



11. A leaf, natural size. 



