EXPLANATIONS OF THE PLATES. 



Plate I. SPRAGUEA UMBELLATA, page 4. 



Fig. 1. Plan of tlie flower. 



2. A flower, magnified. 



3. One of the sepals, magnified. 



4. A petal, more magnified. 



5. A stamen, seen in front, magnified. 



6. The pistil, showing a longitudinal section of the ovary, more magnified. 



7. A ripe dehiscent capsule, with the persistent sepals, equally magnified. 



8. A seed, highly magnified. 



9. Longitudinal section of the same. 



Plate II. FREMONTIA CALIFORNICA, page 6. 



Fig. 1. Plan of the flower. The ovary should have been represented as 5-ce!led. 



2. The androjcium, magnified. 



3. An anther, with the free portion of its filament magnified ; front view. 



4. The same ; side view. 



5. Transverse section of an anther, showing the two loculi of each cell. 



6. Pistil, considerably magnified 



v. Longitudinal section of a flower, only part of the calyx remaining, equally magnified. 



8. An ovule, more highly magnified. 



9. One of the stellate hairs, highly magnified. 



