. Biology and man. Biology; Human beings. 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. E
. Biology and man. Biology; Human beings. 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 ("whi
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