WEEK 12 LABORATORYASTERIDS II |
I. This laboratory is designed for you to identify members of the Asteraceae (Compositae). Refer to Plant Systematics pp. 326-331 and Zomlefer pp. 203 - 211 to become familiar with this family. Take an unidentified member of this family from your personal plant collection to identify, preferably a specimen of Aster (aster) or Solidago (goldenrod). See the laboratory instructor if you don't recognize these two genera. Use the family key to identify your plant to tribe and to genus. These keys are available on the front desk. If you have either Aster or Solidago, use the appropriate key to identify the plant to species. If you have another genus, use your Gleason and Cronquist or other text to identify the plant to species. Refer to your lecture handouts and glossaries for understanding the terms and structures unique to this family.
Wisconsin Key to Asteraceae can be downloaded here.
II. Demonstration floral dissections of Asteraceae. Examine the representatives of two of the three subfamilies of the Asteraceae. Make sure you understand the difference in the construction of the heads of the different groups (radiate head, discoid head, and ligulate head). Identify disc (tubular), ray, and ligulate flowers. Also be able to identify other features associated with the Asteraceae (receptacle, involucre, phyllaries, pappus).
A. Chrysanthemum sp. (ox-eye daisy - tribe Anthemideae of subfamily Asteroideae)
B. Taraxacum officinalis (dandelion - tribe Lactuceae of subfamily Cichorioideae)
C. Senecio or Ageratum or Centratherum
III. Additional representatives of these and other families are placed around the room. As time permits, examine these plants and especially note the floral structures. You will not be required to know these plants; they are simply provided to illustrate additional members of these families. Pages for other families are provided for Plant Systematics [T] or the Zomlefer (Z) resource.
A. Campanula (Campanulaceae - bellflower) (not in [T], pp. 211-213 [Z])
B. Lobelia (Lobeliaceae or now Campanulaceae - lobelia) (not in [T], pp. 211-213 [Z])
C. Daucus carota (Apiaceae - wild carrot, Queen Anne's lace) (pp. 322 [T],193-198 [Z])
D. Anethum graveolens (Apiaceae - dill) (pp. 322 [T],193-198 [Z])
E. Carum corvi (Apiaceae - caraway) (pp. 322 [T],193-198 [Z])
F. Schefflera (Araliaceae - schefflera, umbrella plant) (pp. 322 [T], 193-198 [Z])
G. Scaevola (Goodeniaceae) (p. 331 [T])
H. Scabiosa (Dipsacaceae - scabious) (pp. 334-335 [T])
I. Viburnum (Caprifoliaceae or sometimes Adoxaceae - viburnum) (not in [T], 198-203 [Z])
J. Lonicera (Caprifoliaceae - honeysuckle) (pp. 331- 334 [T], 198-203 [Z])
I. Barnadesia (Asteraceae - one of the most primitive Asteraceae)
J. Tagetes (Asteraceae - French marigold)
K. Senecio cineraria (Asteraceae - dusty miller)
L Ageratum houstonianum (Asteraceae - ageratum)
M. Zinnia angustifolia (Asteraceae - zinnia)
N. Chrysanthemum (Asteraceae - daisy)
O. Gaillardia (Asteraceae - blanket flowers)
P. Centratherum (Asteraceae)
IV. 16 genera of Wisconsin plants to be able to identify on site.1. Osmorhiza (Apiaceae - sweet cicely)
2. Eryngium (Apiaceae - rattlesnake master)
3. Angelica (Apiaceae - angelica)
4. Daucus (Apiaceae - wild carrot, Queen Anne's lace)
5. Panax (Araliaceae or sometimes Apiaceae - ginseng)
6. Aralia (Araliaceae or sometimes Apiaceae - sarsaparilla)
7. Campanula (Campanulaceae - bellflower, harebell)
8. Lobelia (Lobeliaceae or sometimes Campanulaceae - lobelia, cardinal flower)
9. Sambucus (Caprifoliaceae or sometimes Adoxaceae - elder)
10. Lonicera (Caprifoliaceae-- honeysuckle)
11. Helianthus (Asteraceae - sunflower)
12. Chrysanthemum (Asteraceae - ox-eye daisy)
13. Senecio (Asteraceae - ragwort)
14. Taraxacum (Asteraceae - dandelion)
15. Ambrosia (Asteraceae - ragweed)
16. Cirsium (Asteraceae - thistle)
V. Keying: you should be making progress on your plant collections by identifying your specimens to species. Find some unidentified specimens in your collection that belong to the Asterids (families covered in this lab) or especially to the Asteraceae and key them to species.
