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Name: ________________________ Section: ______ Date: ____________EXERCISE G: PLANT IDENTIFICATIONPURPOSE: During this lab you will learn to use a dichotomous key (p.48-49) to identify tree species common in the Boulder area. The identification of a plant is the first step in gaining an understanding of its characteristics, importance and ecology. You will identify native and introduced tree species growing on the Boulder campus. Learning to identify these tree species will help with future field trips as well.TREE IDENTIFICATION1. Give the scientific and common name for the following species. Note: it is scientific protocol to either underline or italicize scientific names. Genus names are capitalized but species names are in small letters. Please follow proper protocol!Scientific name Common nameex.abcdefgh2. What is the difference between a broadleaf and a deciduous tree? Where would you find evergreen broadleaf trees?3. Briefly explain how to differentiate a pine species and a juniper species based on leaf and fruit characteristics.394. Briefly describe how to differentiate a fir species from a spruce species on the basis of leaf characteristics.TREE ECOLOGY5(a) Structure, shape, arrangement of branches and leaves, etc. describe the “architecture” of trees. Describe how the architecture of broad-leaf deciduous trees differs from that of needle-leaf evergreen trees throughout the seasons? Draw a picture, too. (a) For both types, suggest an evolutionary reason why this difference in architecture exists.5. Consider the tree distribution maps provided in Figure 2 (p.52).(a) Describe general differences you observe between the natural distributions of needle-leaf evergreen trees versus broad-leaf deciduous trees in North America and explain why these differences in natural distributions exist? (HINT: think about climate gradients across the continent, particularly precipitation and temperature)40(b) From the maps provided, which of the two general types of trees (broad-leaf deciduous and needle-leaf evergreen) appears dominant in the Rocky Mountains near Boulder? On the campus as a whole, which of the two general types of trees is most common? What might explain this difference?(c) Describe at least two potential ecological consequences of the introduction of many broad-leaf deciduous trees to the Boulder


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CU-Boulder GEOG 1001 - PLANT IDENTIFICATION

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