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TREE IDENTIFICATION ILLINOIS ARBORISTS‟ CERTIFICATION STUDY GUIDE Chapter 2 Jennifer Hitchcock TAXONOMY OR PLANT CLASSIFICATION Based on similar biological characteristics Kingdom Division or Phylum (vascular and nonvascular plants) Angiosperms and gymnosperms Class (monocots and dicots) Orders, Families, Genus, Species (Table 2.1) ANGIOSPERMS (Flowering Plants) Seeds covered by an ovary Deciduous trees Broadleaved evergreens Classes of angiosperms Dicots – two cotyledons or seed leaves Monocots – one cotyledon or seed leaf GYMNOSPERMS (Cone-bearing Plants) “Naked” seeds Conifers or cone-bearing plants COMMON NAMES Can be confusing and are localized Carpinus caroliniana may be called American hornbeam, blue beech, ironwood, musclewood Tulip poplar may be Magnolia x soulangiana, Spathodea campanulata, and Liriodendron tulipifera SCIENTIFIC NAMES Two parts to the name Pinus nigra Quercus alba Acer rubra PLANT NOMENCLATURE Variety: Subdivision of a species that has a difference and breeds true to that difference PLANT NOMENCLATURE Cultivar: A cultivated variety Names are written with single quotes TM U. „Morton‟-Accolade PLANT MORPHOLOGY Woody plant identification is based on plant morphology Morphology – the size, shape and appearance of plant parts PLANT MORPHOLOGY Important to identify trees using a number of features including: Leaves Buds Fruit Flowers Bark Growth form Texture PRINCIPLES OF IDENTIFICATION Leaf structures Leaf margin Leaf base Trichomes LEAF MARGINS, TIPS AND BASES Leaf margins Entire Serrate Dentate Lobed Leaf tips Acuminate Acute Obtuse Truncate Leaf bases Rounded Cordate Acute LEAF TYPES Simple (white oak) Compound (ash) Pinnately compound (locust) LEAF TYPES Bi-pinnately compound (Kentucky coffee tree) Palmate (buckeye) LEAF ARRANGEMENTS Alternate (oak, elm) Opposite (maple, ash, dogwood, buckeye) -MAD Buck/Horse Whorled (catalpa) LEAF ARRANGEMENT FOR CONIFERS Needles in clusters of 2,3,5 (pines) Needles produced singly (firs and spruces) LEAF ARRANGEMENT FOR CONIFERS Awl-like or scale-like (junipers, cedars, and arborvitae) BUDS Narrowly conical Ovoid Conical Stalked Scaled Rounded Valvate IDENTIFICATION KEYS Step by step method for identifying plants Consist of yes or no questions Must understand the terms used .

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Delimitation of Malagasy Tribe Coleeae and Implications for Fruit Evolution in Bignoniaceae Inferred from a Chloroplast DNA Phylogeny
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