. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. on, or is it that portionplus the stalk? Let the pupil applythe above tests, and answer. 84. In the young apple foliage (), what comprises the leaf,— the ex-panded portion, the stalk, the two awl-like bodies at the base, or all of themtogether? How many leaves are thereon the branch? 85. Point out the extremities of theleaf in the wheat (Fig. 74), or inany grass. Does it attach to the stemat 1 or at 6? 86. Designate the leaves in Figs. 75and 76, and give the proofs. XVI. THE PARTS OF LE
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. on, or is it that portionplus the stalk? Let the pupil applythe above tests, and answer. 84. In the young apple foliage (), what comprises the leaf,— the ex-panded portion, the stalk, the two awl-like bodies at the base, or all of themtogether? How many leaves are thereon the branch? 85. Point out the extremities of theleaf in the wheat (Fig. 74), or inany grass. Does it attach to the stemat 1 or at 6? 86. Designate the leaves in Figs. 75and 76, and give the proofs. XVI. THE PARTS OF LEAVES Pig. of wheat. 87. We are now ready to believe thata leaf may have two or three distinctparts,—the expanded portion or blade,the stalk or petiole, and appendages atthe base, or stipules. We also know thatit may have only the blade, as in thelive oak leaves in Fig. 77; and it mayhave only the petiole- or the stipules. THTl PABTS OF LEAVES 81 For example, we have seen that the bud-scales ofthe black currant (Fig. 51) gradually pass intoleaves: but the leaves are borne on the ends of. Fig. Fig. walnut. scales; therefore, the scales must represent trans-formed petioles, not transformed blades. If theenlarged and green bud-scales of the Norway maple G 82 LUSSOIfS WITS PLANTS (Fig. 50) are petioles, we have an example ofleaf-stalks which perform functions of leaf-blades.
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
