Tree Identification Terms

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2A TREE IDENTIFICATION TERMS CONIFER: A tree that bears cones and has needles. BUNDLE: Group of conifer needles SCALY: Conifer needles that are flat held together at the base by a small and overlapping, like fish scales. papery wrap called a fascicle. BROADLEAF*: A tree that has broad leaves rather than needles. *Note: We use “broadleaf” instead of “deciduous.” A deciduous tree loses all its leaves for part of the year. A tamarack is a conifer (has cones and needles) that loses its needles in the fall (is deciduous). ALTERNATE BRANCHING: A branching OPPOSITE BRANCHING: A branching pattern pattern where side branches and where side branches and leaves, leaves do not grow directly grow directly across the stem from across from each other. each other. LEAF Guide • 7-8 UNIT Field Enhancement 1: Tree Identification 193 2B TREE IDENTIFICATION TERMS LEAF MARGIN: The ENTIRE: A type of leaf margin TOOTHED: A type of leaf margin outer edge of a leaf. that is smooth and has no that has small points along it wavy or pointed edges. (teeth). Fine-toothed means that the teeth are small. SINUS: The space between lobes on a leaf. Course-toothed means that the teeth are large. LOBE: A projection that Single-toothed means that all the extends outward from the teeth are about the same size. center of the leaf. Double-toothed means that on each tooth there is a smaller tooth. PETIOLE: The stalk that supports a leaf VEINS: Distinct lines of tissue and attaches the leaf to that form the framework of a the twig. They can be leaf. Used for food and water round, flat, or square. transport. LEAF BASE: The lower edge of a leaf. COMPOUND LEAF: A type of leaf that has many smaller SIMPLE LEAF: A type of leaf leaflets that attach to its petiole, that has one blade attached which is attached to a twig. to a twig by a petiole. LEAFLET: A small leaf that is part of a compound leaf. NOTE: The axillary bud is just above the leaf petiole or leaf scar on the twig. Look for this bud to help you decide if it is a simple or LEAF SCAR: The mark compound leaf. Leaflets don’t have left behind on a twig when this bud at their base. a leaf falls from a tree. 194 Field Enhancement 1: Tree Identification LEAF Guide • 7-8 UNIT.

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