. The Botanical Class-Book and Flora of Pennsylvania. FORM OF LEAVES. 89 A pinnate leaf sometimes consists of as many as twentyor even fifty leaflets, as in the Acacia. 5. Bipinnate, (doubly pinnate, Fig. 52) when a commonpetiole bears pinnate leaves on both of its sides. Ex.: WildElder (Aralia hispida.) 6. Tripinnate, (triply pinnate, Fig. 53,) when the com-mon petiole bears bipinnate leaves on each side. Ex.: An-gelica tree, (Aralia spinosa). 53.. 109. Sometimes the number of leaflets is but three, andthe leaf becomes pinnately trifoliate, (Fig. 54,) and is readilydistinguished by having the

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. The Botanical Class-Book and Flora of Pennsylvania. FORM OF LEAVES. 89 A pinnate leaf sometimes consists of as many as twentyor even fifty leaflets, as in the Acacia. 5. Bipinnate, (doubly pinnate, Fig. 52) when a commonpetiole bears pinnate leaves on both of its sides. Ex.: WildElder (Aralia hispida.) 6. Tripinnate, (triply pinnate, Fig. 53, ) when the com-mon petiole bears bipinnate leaves on each side. Ex.: An-gelica tree, (Aralia spinosa). 53.. 109. Sometimes the number of leaflets is but three, andthe leaf becomes pinnately trifoliate, (Fig. 54, ) and is readilydistinguished by having the two lateral leaflets attachedto the petiole at some distance below its apex, as in thecommon Garden Bean. Such a leaf may even be> reducedto a single leaflet, as in the Orange. 54. 55.