EXPLANATION OF TRE PLATES. 395 



1^5 Sympliytum officinalej a raceme of flowers, the na- 

 tural size. 



15, Polemonlum reptans, part of a corymb, the natural 

 size ; l^a, cross-section of the capsule, magnified. 



16, Quamoclit coccinea, a part of the stem in flower, 

 natural size. 



17, Solanum Dulcamara, a part of the cyme, the natu- 

 ral size. 



18, Ilyoscyamus niger, a capsule opening transversely all 

 round near the apex, magnified. 



19, Datura Stramonium, a small flower of the natural 

 size. 



20, Gentiana Andrewsii, a flower ; 20<^, the corolla laid 

 open, with stamens and pistil ; both the natural size. 



21, Apocynum androssemifolium, part of a cyme ; 21(^, 

 fruit ; both of natural size ; 21^, stamens with the anthers 

 connivent around the pistils ; 21<?, the 2 pistils with their 

 large, common stigma ; 21^, a seed with its coma ; all 

 magnified. 



22, Amsonia Tabemsemontana, a flower, natural size. 



PLATE XL 



1, Asclepias variegata, an expanded flower ; la^ a sta- 

 men with its appendage — that is, a segment of the corona, 

 containing a horn ; both of about the natural size ; 15, the 

 two pistils, with the pollen masses attached to the large, 

 common stigma ; 1<?, pollen masses separate ; both figures 

 magnified ; Id, one of the two follicles of Asclepias Cor- 

 nuii, resulting from the same flower, natural size. 



2, Chionanthus Yirginica, part of the panicle of flowers, 

 natural size. 



3, Fraxiuus viridis, Mx. f., a samara, of natural size. 



4, Aristolochia Serpentaria, a flower, natural size ; ^a^ 



