22 
EDMUND W. SINNOTT AND IRVING W. BAILEY 
Fig. 63. Diospyros Lotus L., cotyledon (leaf pinnate simple). 
Fig. 64. Ipomaea purpurea Roth, cotyledon (leaf palmate simple). 
Fig. 65. Eranthemum leuconeurum Fisch., cotyledon, after Lubbock (leaf 
pinnate simple). 
Fig. 66. Coffea arabica L., cotyledon, after Lubbock (leaf pinnate simple). 
Fig. 67. Viburnum Opulus L., cotyledon (leaf palmate-lobed). 
Fig. 68. Cucumis Melo L., cotyledon (leaf palmate-lobed). 
Fig. 69. Senecio multiflorus DC, cotyledon (leaf pinnate simple). 
Fig. 70. Tropaeolum majus L., young leaf, near the growing point. 
Fig. 71. Tropaeolum majus L., mature leaf. 
Fig. 72. Pterospermum Heyneanum Wall., leaf from coppice shoot. 
Fig. 73. Pterospermum Heyneanum Wall., leaf from mature branch (both after 
Brandis). 
Fig. 74. Podocarpus Nagi Pilger, many-veined (palmate) leaf. 
Fig. 75. Podocarpus Hallii Kirk, primitive type of leaf, with single bundle. 
Fig. 76. Sagittaria latifolia Willd., mature leaf. 
Fig. 77. Trillium cernuum L., mature leaf. Both this and the last are essen- 
tially like many dicotyledonous leaves in venation. 
Fig. 78. Trillium cernuum L., diagrammatic cross section through the node, 
showing the similarity to the dicotyledonous type. 
Fig. 79. Agapanthus umbellatus L'Her., diagrammatic cross section through 
the seedling, showing the three bundles in the cotyledon and in the first leaf (after 
Coulter and Land). 
Fig. 80. Viburnum acerifolium L., cross section through the petiole. 
Fig. 81. Ribes rubrum L., cross section through the petiole. 
Fig. 82. Ulmus americana L., cross section through the petiole. 
Fig. 83. Reconstruction of the leaf (with cross section of the node) 
supposedly primitive for the Angiosperms. The node is trilacunar and the veins 
depart directly into the lamina without approximation in a petiole. 
Fig. 84. A typical modern palmate lobed leaf. The node is trilacunar but 
the traces are pulled closely together in a narrow petiole before separating again 
in the lamina. 
Fig. 85. A pinnate simple leaf. The node has become unilacunar and the 
single trace continues as a strong midrib. 
