. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. FiG. PARTICULAR TYPHS OF FLOWERS, CONTINUED 221 mental points of comparison ; andby means of these points we areable to con-struct classifi-cations. Someof the pointsof most impor-tance in com-parative stud-ies of flowersare: the numer-ical plan; therelation of theparts with reference tothe ovary; the coales-cence of parts or series;the reinforcement ofthe flower. Suggestions.—With the sug-gestion of the last paragraphin mind, the pupil should com-pare the various flowers whichh
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. FiG. PARTICULAR TYPHS OF FLOWERS, CONTINUED 221 mental points of comparison ; andby means of these points we areable to con-struct classifi-cations. Someof the pointsof most impor-tance in com-parative stud-ies of flowersare: the numer-ical plan; therelation of theparts with reference tothe ovary; the coales-cence of parts or series;the reinforcement ofthe flower. Suggestions.—With the sug-gestion of the last paragraphin mind, the pupil should com-pare the various flowers whichhe commonly meets. If a,dozen or more flowers of dif-ferent kinds can be had atonce, it is excellent practiceto construct a method of ar-ranging or classifying theminto groups or series. If theteacher were to consult agardener sometime in advance, Fig. 222 LESSONS WITH PLANTS a colleetion of flowers for this study could be easily securedin winter time. Even without previous notice, he might be ableto supply carnations, violets, fuchsias, heliotropes, geraniums,begonias, alyssum, hyacinths, roses, freesias, oxalises, bouvardias,lilies-of-the-valley, mignonette, pansies, chrysanthemums, cinerarias. XLI. PARTICULAR TYPES OF FLOWERS,CONTINUED. (THE ORCHIDS) 254. A ladys-slipper, or cypripedium, is shownin Fig. 213. The flower is exceedingly irregular. There are four obvious petal-like parts, a a b d, and a sac(or slipper) c, which is nodoubt a part of the peri-anth. This makes only fiveparts. A study of homolo-gies in other cypripediums,however, shows that the lowermember, d, represents twounited parts, and we mustbelieve that the flower istrimerous. The three partsstanding for the calyx arethe outermost ones, repre-sented by the united parts, d, and the upper oneat a. The parts representing petals, then, are theside pieces a and b, and
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