plat:e v. 



A. — TJlmus montana, Smith : p. 16. 



1. A perianth with stamens. 



2. The pistil. 



3. The winged seed. 



B. — Salix Caprea, Linnceus : p. 17. 



1. A branch, with the male catkins. 



2. One of the male flowers, separate. 



3. A female catkin. 



4. One of the female flowers, separate. 



5. A seed.- 



C. — OreMs maeulata, Linncdus : p. 19. 



{The name is misprinted '^mascula^' on the plate.) 



1. A flower, showing the three recurved sepals, two con- 



vergent petals, and three-lobed lip. 



2. The column and cells of the single perfect anther. 



3. One of the pollen-masses. 



D.— Cypripedium Calceolus, Limiceus : p. 19. 



1. Eront view of the column, with its abortive central 



stamen, and two lateral perfect ones. 



2. Back view of the same. 



