Elementary botany . Each year new bulbs are formed at the end of runners from a parent bulb. These runners penetrate each year deeper into the soil. The deeper bulbs bear the flower stems. 933. Genus lil-ium. — While thelily differs fromeither the trilliumor erythronium, yetwe recognize a re-lationship when wecompare the peri-anth of six col-ored parts, the 6stamens, and the3-sided and long3-loculed ovary. 934. Family Liliaceae.—The relationship between genera, asbetween trillium, erythronium, and lilium, brings us to a stillhigher order of relationship, where the limits are broader than inthe
Elementary botany . Each year new bulbs are formed at the end of runners from a parent bulb. These runners penetrate each year deeper into the soil. The deeper bulbs bear the flower stems. 933. Genus lil-ium. — While thelily differs fromeither the trilliumor erythronium, yetwe recognize a re-lationship when wecompare the peri-anth of six col-ored parts, the 6stamens, and the3-sided and long3-loculed ovary. 934. Family Liliaceae.—The relationship between genera, asbetween trillium, erythronium, and lilium, brings us to a stillhigher order of relationship, where the limits are broader than inthe genus. Genera which are thus related make up the the case of these genera the family has been named after thelily, and is the lily family, or Liliacece. 935. Order, class, group. — In like manner the lily family,the iris family, the amaryllis family, and others which showcharacters of close relationship are united into an order whichhas broader limits than the family. This order is the lily order,. Fig. (erythronium). At left below pistil, andthree stamens opposite three parts of the perianth. Bulbat the right. 490 CLASSIFICATION OF ANGIOSPERMS, or order Liliales. The various orders unite to make up the class,and the classes unite to form a group. 936. Variations in usage of the terms class, order, etc.— Thus, according to the system of classification adopted by some,the angiosperms form a group. The group angiosperms is thendivided into two classes, the monocotyledones and dicotyledones.(It should be remembered that all systematists do not agree inassigning the same grade and limits to the classes, subclasses,etc. For example, some treat of the angiosperms as a class,and the monocotyledons and dicotyledons as subclasses; whileothers would divide the monocotyledons and dicotyledons intoclasses, instead of treating each one as a class or as a differ also in usage as to the termination of theordinal name; for example, some
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