Botany on Campus: Applying What We Have Learned

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I. Morphology of a Woody Twig

Students should be able to answer the following questions about aCarya twig:

1. The twig is encased in a water-proof, air-tight covering (the periderm). What observable structure functions to allow gas exchange to the underlying living tissue? (link to answer)

2. Based on your observation of the dormant twig, are the leaves arranged in an opposite or alternate fashion? (link to answer)

3. Botanically what are the bud scales? (Link to answer)

4. Without looking at the cross section of the stem determine how many years growth is represented by your twig. (link to answer)

 

Pseudoterminal Buds

II. Early Growth of Tree Buds

Know that tree buds of temperate species are more than an undifferentiated apical meristem. Typically, buds consist of an apical meristem surrounded by leaf primordia each attached at a node of an immature stem. In the bud, the internodes are telescoped to create a tight compact miniature shoot. Some buds have bud scales and others do not. Some buds have preformed flower primordia. Early growth in the spring involves the rapid growth of plant organs formed in the bud during the preceding summer.

View Early Growth of Twigs Late April in Dane County - In these examples the leaf primordia emerging in the spring were formed from the apical meristem the preceeding summer and lay dormant in the bud through the winter.

- You do not need to memorize these exampes

View Early Growth of Twigs with Flower Buds Late April in Dane County- In these examples the flower primordia emerging in the spring were formed from the apical meristem the preceeding summer and lay dormant in the bud through the winter.

- You do not need to memorize these exampes

 

III.. Various Spring Flowers on Campus

- be able to provide exampes of flowers observed that are complete or incomplete, perfect or imperfect, monoecious or dioecious.

 Box Elder (Acer negundo)  Dandelion - Flowers  Norway Maple (Acer platanoides)
 Currant (Ribes sp.)  Forsythia - flowering shrub  Paper birch (Betula paperifera)
 Dandelion - head  Forsythia - flowers  Sugar Maple (Acer saccharum)

 

IV. Conifers on Campus - recognize the following structures

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