Secondary leaf, 2 Sectional characters, 18 Seed, wing of, 16 winged, 16 wingless, 16 Septal resin-ducts, 6 Serotinous cone, 14 Species, classification of, 22 Specific characters, 20 Spring-shoot, 2 Staminate flowers, 7 Stelar tissues of leaf, 6 Stomata of leaf, 4 Strobi-Group, 30 Strobus, Opiz = Pinus, 24 Strobus strobus Small = Pinus strobus, 36 Subsectional characters, 20 Subterminal conelet, 7 flower, 7 Symmetrical cone, 10 Terminal umbo, 8 Tissues of the cone, 12 leaf, 4 wood, 17 Umbo of the cone dorsal, 8 terminal, 8 Uninodal branchlet, 2 spring-shoot, 2 Uniform hypoderm, 6 Variation, 21 Wing of seed, adnate, 16 articulate, 16 Winged seed, 16 Wingless seed, 16 Wood, 17 Wood-strands of the cone, 14 Wood-tissues, 17 Transcriber's Notes: 1. The position of Plates was changed to the end of the section referencing each. 2. Species names appear to be Capitalized when they are names of persons or places in this book, as in other material of this period.