EXPLANATIONS OF THE PLATES. 



Plate I. SPRAGUEA UMBELLATA, page 4 



Plan of the flower. 



A flower, magnified. 



One of the sepals, magnified. 



A petal, more magnified. 



A stamen, seen in front, magnified. 



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



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



A seed, highly magnified. 



Plate II. FREMONTIA CALIFORNICA, page 6. 



Plan of the flower. The ovary should have been repr 

 The androecium, magnified. 



An anther, with the free portion of its filament magnil 

 The same ; side view. 



5. Transverse section of an anther, showing the two locul; 



6. Pistil, considerably magnifiel. 



Longitudinal section of a flower, only part of the caly: 



An ovule, more highly magnified. 



One of the stellate hairs, highly magnified. 



