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Plants and People

Biology 328. Plants and People. Lab – 5: Major Families II. http://www.desktopscenes.com/Scenes%20from%20Muir%20Woods%20(2003)/slides/Path%20to%20the%20Woods.html. Objective. To familiarize you with vegetative and floral morphology of 2 families Grasses - Poaceae/Graminae

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Plants and People

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  1. Biology 328 Plants and People Lab – 5: Major Families II http://www.desktopscenes.com/Scenes%20from%20Muir%20Woods%20(2003)/slides/Path%20to%20the%20Woods.html

  2. Objective • To familiarize you with vegetative and floral morphology of 2 families • Grasses - Poaceae/Graminae • Legumes- Fabaceae, Caesalpiniaceae, and Mimosaceae

  3. Grasses - Poaceae

  4. Vegetative morphology Monocot • Roots – Fibrous • Stem (Culm) – Nodes and internodes • Stem modifications – rhizome, stolon/runner • Leaves – Sheath, lamina, ligule (outgrowth between sheath and lamina)

  5. Floral morphology • Flower/Floret – Basic unit, parts of 3’s , highly reduced, non showy • Perianth (calyx + corolla) – As lodicules at the base of the ovary. • Stamens • Pistil - Ovary, styles, and plumose stigmas • 2 fertile bracts - Lemma (larger) and Palea (smaller) • 2 or 3 florets – Spikelet • 2 sterile bracts - Glumes • Fruit – Grain/Caryopsis

  6. Legumes- Fabaceae, Caesalpiniaceae, and Mimosaceae

  7. Floral morphology

  8. Today’s lab

  9. Poaceae • 1. Examine an oat (Avena) spikelet. Note the two basal glumes, which completely enclose the florets. There should be three florets above the glumes, with the terminal one not completely developed. Separate a palea from the lemma that encloses it. Is there any difference between a palea and a lemma? Also, observe the flower. • 2. Diagram the oat (Avena) spikelet labeling glumes, florets, and the lemma and palea of one floret. • 3. Examine and diagram a Bromus spikelet labeling the organs of its basic structure, i.e., glumes and paleas and lemmas of each floret. • 4. Examine specimens of other grass genera on display.

  10. Legumes- Fabaceae • Subfamilies – Papilionoideae, Caesalpinioideae, and Mimosoideae • Compare the sample material with descriptions and terminology given in lecture and laboratory notes. For each floral sample, examine floral structure, paying close attention to the arrangement and structure of the androecium and perianth. • Examine the legumes on display. Which of them are foods? Which of them are forage?

  11. Summary Today’s Lab • Familiarizing vegetative and floral morphology of grasses and legumes Next week’s lab • Quiz - Major Families II • Wood, paper and Cushing library

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