EXPLANATION OF THE PLATES. 389 



caljx ; 45, one of the pistils ; both figures more or less 

 magnified. 



5, Rosa, a flower of the natural size, with the petals re- 

 moved, and cut through vertically, showing the numerous 

 stamens on the top of the caljx-tube, and the many pistils 

 inserted within the hollow receptacle, which lines the urn- 

 shaped and fleshy tube of the calyx. 



6, Geum, the calyx in fruit, the natural size. 



7, Rhexia Yirginica, a small flower of the natural size ; 

 ^a, cross-section of the capsule, showing the four cells 

 and the four many-seeded placentae, projecting from the 

 central axis,- magnified. 



8, (Enothera biennis, a flower of the natural size ; Scr, 

 one of the stamens with the anther versatile ; 85, the pod 

 cut through transversely ; both magnified. 



9, Sicyos angulatus, sterile flowers of the natural size ; 

 ^a, the united stamens with the anthers tortuous; 95, 

 one of the anthers detached ; both figures magnified. 



10, Ribes rubiiim, a flower ; lOd, a raceme in fruit ; both 

 of the natural size ; 10a, a flower ; 105, a stamen ; 10c, 

 pistil ; 10^, vertical section of a berry ; all magnifled. 



11, Penthorum sedoides, a flower, the natural size; 

 11a, calyx in fruit, magnified. 



PLATE YI. 



1, Saxifraga oppositifolia, a flowering branchlet, the 

 natural size ; la, the two pistils united ; 15, cross-section 

 of the double pistil ; both figures more or less magnified. 



2, Hamamelis Yirginica, three flowers in a cluster or 

 head, of the natural size ; 2a, one of the flowers detached ; 

 25, the pistil; 2<?, two of the stamens; the left one per- 

 fect, the other sterile ; all magnified ; 2c?, a capsule, the 

 natural size. 



