B'j! 107, Bureau of Plant Industry, U. S. Dept of Agriculture. 



Plate 



Fig. 1 . -Marginal-fruited Shield-Fern 



DRYOPTERIS MARGINALIS'. 



Fig. 2.— Skunk-Cabbage Spathyema 



FOETIDA*. 



Fig. 3.— Sweet-Flag ' Acorus calamus). Fig. 4.— Bethroot 'Trillium erectum 



