. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. of florists smilax. (Fig. 102.) The leaves are seen to be minute dryscales, while the branches have developed into ex-panded leaf-like bodies, and the flowers are bornefrom supernumerary buds (recall the orange, ). A further proof that these foliaceous bodiesare branches occurs in the closely allied butchersbroom of the Old World, in. which flowers arisefrom the axil of a little scale borne upon themidrib of this leaf-like Branches may notonly perform the functio
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. Fig. of florists smilax. (Fig. 102.) The leaves are seen to be minute dryscales, while the branches have developed into ex-panded leaf-like bodies, and the flowers are bornefrom supernumerary buds (recall the orange, ). A further proof that these foliaceous bodiesare branches occurs in the closely allied butchersbroom of the Old World, in. which flowers arisefrom the axil of a little scale borne upon themidrib of this leaf-like Branches may notonly perform the functions of leaves, therefore,but may have all the appearance of leaves. BlSeUISSS OF LEAVES, CONCLUDED 105 114a. Branches which imitate leaves are called cladophylla (wordmeaning branch-leaves; singular, cladophyllum).. Fig, of an acacia. Fig. of another acacia. 115. A leaf of the long-leaf acacia (from Au-stralia, now sometimes grown in glass houses) isshown in Fig. 103. It is typical of a class ofacacias. This leaf has a peculiar, rigid structure,and it stands edgewise to the branch; these facts, 106 ^lyJESSOJyS WITB PLANTS together with certain morphological considerations,cause it to be regarded as a leaf-like petiole. 115a. This particular type of leaf—one which is interpreted tobe a modified petiole—is called a phyllodium. 116. Another acacia is shown in Here the phyllodia are present,standing edgewise. But there are alsospines beneath them. If the criterionof mere position is to be followed, weshould consider these phyllodia to be clad-ophylla; but the leaves of young seed-lings and evidences of morphology showthat the spines are probably stipules ofthe phyllodia. If, now, we return to thephyllodia in Fig. 103, we notice a minutescar at the base of each (in
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
