Explanation of PL XXI. 



Styrax formosaua MAT SUM. 



Fig. 1. A branch. 



2. A flower. 



:}. Corolla. 



4. Stamens. 



f>. An ovary in vertical section. 



6. A fruit. 



7. A seed. 



8. An albumen. 



9. An embryo. 



