THE PLANT KINGDOM 263 



bo distinguished from its coordinate groups, and making in this way what 

 is commonly known as a "key" to these objects: Apple, oak log, pump- 

 kin, maple leaf, cotton fiber, apple blossom, potato, tulij) bulb, peanut, 

 turnip, pine cone, peach, spruce shingle, strawberry, automobile tire, 

 squash seed, blade of grass, strip of birch bark. 



666. In describing the plant kingdom in the later chapters of this 

 book, much more space, relative to their number of species, has been 

 given many of the lower groups than has been given the angiosperms. 

 Why is this justifiable? 



667. State what advantages and disadvantages the scientific name of a 

 plant has as compared with its "common" name. 



668. In popular literature we often find that when the scientific name 

 of an animal or plant is mentioned, it has an article in front of it, as, 

 for example, "the Solanum tuberosum." Why is this incorrect? 



REFERENCE PROBLEMS 



108. What is meant by the "life-history " of a plant species? 



109. Who was chiefly responsible for the establishment of our modern 

 conception of the Alternation of Generations? 



110. In general, how do characters which distinguish the larger groups 

 of plants, such as orders and families, differ from those which distinguish 

 smaller ones, such as genera and species? 



111. Why is it that Latin and Greek are the languages from which the 

 scientific names of plants and animals have been chiefly derived ? 



112. What is the scientific name of the American Elm? of the Paper 

 Birch? of the Apple? of the Cowslip? of the Blue Flag? 



113. Find the species, genus, family, order, class, subdivision and division 

 to which each of the following plants belongs, and give the correct scientific 

 name of each: The White Fine; the Red Oak; the Common Field Daisy; 

 the Tiger Lily. 



114. If two botanists each give a different name to the same plant species, 

 what is it that determines which name shall be accepted as the correct one? 



115. What is meant by the "flora" of a region? by the "moss flora" of 

 a region? by the "forest flora" of a region? 



116. Give the derivation of the following terms and explain in what 

 way each is appropriate: 



Gamete Sporophyte Genus 



Zygote Gametophyte Species 



