Text-book of structural and physiological botany . r the fall of the leaf, as in the spruce-fir, the portion^ thatthus remains is called a pulvinus. After the fall of the leaf,the spot to which it was attached is indicated by a scar orcicatrix. The petiole may be cylindrical, semicylindrical,channeled, or flat, and is sometimes winged, or provided The External Form of Plants, 91 with leaf-like expansions at the side. Some Australianspecies of ^^(2;^/^ possess in the early years of their life bipin-nate leaves with a more or less flatly expanded petiole(Fig. 143, h) ; but subsequently the pinna
Text-book of structural and physiological botany . r the fall of the leaf, as in the spruce-fir, the portion^ thatthus remains is called a pulvinus. After the fall of the leaf,the spot to which it was attached is indicated by a scar orcicatrix. The petiole may be cylindrical, semicylindrical,channeled, or flat, and is sometimes winged, or provided The External Form of Plants, 91 with leaf-like expansions at the side. Some Australianspecies of ^^(2;^/^ possess in the early years of their life bipin-nate leaves with a more or less flatly expanded petiole(Fig. 143, h) ; but subsequently the pinnae are no longerdeveloped, the branching is also suppressed, and the simplepetiole, now strongly developed into a flat plate (Fig. 143,a)^ performs all the functions of the leaf Such a petiole istermed d^phyllode^ and is distinguished from leaves of nor-mal structure by its mode of development, as well as by itsvertical position.^ At the base of the petiole on both sides are frequentlyfound flat leaf-like appendages, the stipules (Figs. 144, 145)..
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