CLASS 1 GYMNOSPERMS ("naked seed"). Naked-seed plants; include 

 all the cone-bearing trees. Examples, cycads, ginkgo, sago palm, yews, larches, 

 pines, cypress, spruces, cedars, sequoias. 



CLASS 2 ANGIOSPERMS ("enclosed seed"). Enclosed-seed plants; most 

 of the familiar plants belong to this class; includes the broad-leaved trees, 

 shrubs, grasses, herbs, vegetables, fruits, and farm crops. 



SUBCLASS 1 MONOCOTYLEDONS With one cotyledon; bundles scat- 

 tered throughout the stem; parallel- veined leaves; flower parts usually in 3's 

 or 6's. Examples, cat-tail, water plantain, grasses and grains, sedges, palms, 

 Indian turnip, rushes, spiderwort, lilies, bananas, orchids (see illustration, 

 p. 146). 



SUBCLASS 2 DICOTYLEDONS With two cotyledons; woody bundles 

 arranged symmetrically in stem; net- veined leaves; flower parts usually in 

 4's or 5's (see illustration, p. 147). 



Order 1 Archichlamydeae ("primitive coat, or envelope"). Petals 

 in flowers either quite separate or entirely lacking. Examples, catkin- 

 bearing trees (willows, walnuts, oaks, beeches), smartweed, pink family, 

 buttercup family, water lilies, rose family, parsley family, bean family. 



Order 2 Svmpetalae ("joined petals"). Petals united into tube or 

 cup. Examples, heath family, primrose family, gentian family, mint 

 family, morning-glory family, plantain family, madder family, honey- 

 suckle family, composites (daisy, aster, sunflower, goldenrod, etc.). 



B. MAIN GROUPS OF ANIMALS 



The main branches of animals and the subdivisions of the more important 

 branches are outlined below. 



PHYLUM I PROTOZOA ("first animals"). The simplest animals; body of 

 one cell; live for the most part in fresh or in sea water, but many species are 

 parasitic in plants and animals. 



CLASS I SARCODINA ("flesh"). Body without definite shape; move by 

 means of false feet, or pseudopods (see illustrations, pp. 23 and 25). 



CLASS 2 MASTIGOPHORA ("whip-bearing"). Body of definite shape 

 enclosed in cuticle; move by means of one or more whiplike flagella (see 

 illustration, p. 179). 



Ameba radiosa 



Actinophiys 



RAdiolarUn 



(Heliospbacra QctiDOta} 



AieeUa 



^^^V^ 1 1 \ \ \ Foranuniieran Trypanost 



VorUcella 



Spirosiomiuo 



691 



