EXPLANATION OF THE PLATES. 393 



12, Utricularia vulgaris, a flower of the natural size. 



13, Pinguicula vulgaris, a flower of the natural size. 



PLATE IX. 



1, Catalpa bignonioides, flowers, one of them open, the 

 natural size. 



2, Aphyllon fasciculatum, flowers, the natural size ; 2a, 

 a stamen magnified. 



3, Linaria vulgaris, a flower, the natural size. 



4, Collinsia vema, a flower, the natural size. 



5, Chelone glabra, a flower, the natural size. 



6, Mimulus alatus, a flower, natural size. 



7, Gerardia purpurea, a flower, natural size. 



8, Melampyrum pratense, var. Americanum, Benth., 

 the summit of the plant in flower, natural size ; 8<x, a 

 flower magnified. 



9, Yerbena officinalis, summit of the stem, in flower, the 

 natural size ; 9<:^, corolla cut open, showing the stamens ; 

 95, the fruit ; both figures magnified. 



10, Teucrium Canadense, a flower, magnified. 



11, Mentha piperita, a flower, magnifled. 



12, Lycopus, a flower ; 12«, the pistil ; both magnified. 



13, Trichostema Canadense, a flower of natural size. 



14, Cunila Mariana, a flower, magnified. 



15 and l^a, flowers of Hyssopus officinalis, slightly 

 magnifled. 



16, Pycnanthemum, a flower, about the natural size ; 

 16«, the calyx separate, with the style removed. 



IT, Origanum vulgare, a flower, magnified. 



18, Thymus Serpyllum, a flower, much magnified. 



19, Collin sonia Canadensis, a flower, natural size. 



20, Melissa officinalis, a flower, double the natural size. 



21, Satureja hortensis, a flower, enlarged. 



