viii CONTENTS. 



XXIV. Wake-robin (Trillium sp.) 145 



XXV. Buttercup (Ranunculus sp.) 158 



XXVI. Shepherd's-purse (Capsella Bursa-pastoris) 163 



XXVII. Sunflower (Helianthus annuus) 167 



XXVIII. Glossary of Terms 173 



XXIX. Index 187 



