EXPLANATION OF THE PLATES.

Plate CXXY. Gleditsia triacanthos.

1. A flowering branch of the staminate plant, natural size.

2. A flowering branch of the pistillate plant, natural size.

3. Diagram of a flower.

4. A staminate flower, enlarged.

5. Vertical section of a staminate flower, enlarged.

6. A pistillate flower, enlarged.

7. Vertical section of a pistillate flower, enlarged.

8. Vertical section of an ovary, enlarged.

9. An ovule, much magnified.

Plate CXXVI. Gleditsia triacanthos.

1. A cluster of fruit and a spine, natural size.

2. Vertical section of a portion of a legume, natural size.

3. A seed, slightly enlarged.

4. Vertical section of a seed, natural size.

5. Cross section of a seed, natural size.

6. An embryo, slightly enlarged.

7. A doubly pinnate leaf, natural size.

8. A winter branchlet, natural size.

9. Vertical section of a part of a branch showing the position of the buds.