. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. e same in all of them. The end of thepetiole is slightly expanded, but the insertion (asthe mode of attachment is called) may be saidto be ordinary. 120. Now compare the dahlia (Fig. 91). Herethe base of the petiole is dilated; and it willbe observed that in this particular case the basesof the two opposite petioles cohere, and thismay explain the ring-like leaf-scar of the dahliashown in Fig. 38. When two sessile , oppositeleaves cohere, they are said to be connate (). 121. Sessile le
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. e same in all of them. The end of thepetiole is slightly expanded, but the insertion (asthe mode of attachment is called) may be saidto be ordinary. 120. Now compare the dahlia (Fig. 91). Herethe base of the petiole is dilated; and it willbe observed that in this particular case the basesof the two opposite petioles cohere, and thismay explain the ring-like leaf-scar of the dahliashown in Fig. 38. When two sessile , oppositeleaves cohere, they are said to be connate (). 121. Sessile leaves have various methods ofattachment. Fig. 107 is the common mullein. Theedges of the leaf run down the stem, and suchleaves seldom fall away with a distinct and clean-cut fracture or scar. This is a decurrent leaf may be clasping or amplexicaul (), the length of the basal lobes varying these lobes are long and ear-like, and ATTACHUBNT OF LEAF AND PETIOLE 111 are said to be auriculate. If the blade completelysurrounds the stem (Fig. 109), the leaf is Fig. leaves of honeysuckle. KiG. leaf of mullein. 122. The question was raised (85) as to thepoint of attachment of the wheat leaf. It wasprobably decided that it is attached at 6. (See 112 J^HSSOjyS WITS PLANTS Fig. 74.) The leaf has no petiole, then, but ithas two distinct parts. The upper part may becalled the blade, as in other leaves, and the part
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
