EXPLANATION OF THE PLATE. 

 Plate CLX. Crataegus invisa. 



1. A flowering branch, natural size. 



2. Vertical section of a flower, enlarged. 



3. A calyx-lobe, enlarged. 



4. A fruiting branch, natural size. 



5. A nutlet, enlarged. 



6. A leaf from a young vigorous shoot, natural s 



