EXPLANATION OF THE PLATE. 

 Plate CIII. Crataegus Ludoviciensis. 



1. A flowering branch, natural size. 



2. Vertical section of a flower, enlarged. 



3. A calyx-lobe, inner face, enlarged. 



4. A fruiting branch, natural size. 



5. Cross section of a fruit, enlarged. 



6. Vertical section of a fruit showing the nutlets, 



7. A nutlet, dorsal view, enlarged. 



8. A nutlet, ventral view, enlarged. 



