Note: Family study exercises are designed to
you with the major characters of some important flowering plant
Follow the guidelines on your instruction sheets. Answer questions and
diagram structures ON THE SHEETS and save them to study from.
in addition to those requested in the lab instructions, will be useful.
For exams, you will be expected to be able to identify structures
in preserved or fresh floral material. Herbarium specimens will be on
during each laboratory period. You should be able to identify these to
genus, family, and subclass by recognizing the characters we discuss. For
a copy of the overhead presented in lab, click here.
- Magnoliaceae - Magnoliales:
TAKE half of a flower bud. The Magnoliales includes taxa with
flowers that have retained some "primitive" characters.
LOOK for an elongate floral axis, numerous parts that are
spirally arranged, lack of differentiation between calyx and corolla,
(regular flowers), and lack of connation (fusion of like parts)
and lack of adnation (fusion of unlike parts). .Compare against
th floral formula given in W&K (p. 185.) Liriodendron
appears to be syncarpous (carpels fused) at this stage of development.
However, the carpels will separate at maturity (see
dried specimen) into samaras --winged achenes.
DIAGRAM YOUR LIRIODENDRON FLOWER:
- Family: ___________________ Ranunculales:
The Ranunculales, while generally sharing the primitive floral
of the Magnoliales, are mostly herbaceous, an advanced characteristic.
EXAMINE a Ranunculus
flower and compare what you see against fig. 11-9 (p. 191) in
W&K and with the wall chart. Note the regular
(ACTINOMORPHIC) perianth with reflexed (bending back) sepals, and
extended floral axis with numerous stamens and pistils.
CONSTRUCT a floral formula.
Floral Formula: ______________________________________________
KEY to family and genus (Terrestrial herb with yellow
ISOLATE an individual pistil (unicarpellate, simple) from the APOCARPOUS
This will mature
into a dry, indehiscent fruit. Dissect this carpel and determine fruit
SKETCH RANUNCULUS FLOWER AND FRUIT:
- Papaveraceae - Papaverales:
The Papaverales represent an advanced element of the Magnoliidae.
Continue with the
EXAMINE the video or demonstration flower and note two derived
aspects of floral structure: 1) adnation of androecium and
2) connation of carpels. (Click to see fruit of Papaver)
SKETCH these features:
Also SKETCH cross-section of the ovary. How many carpels in
this SYNCARPOUS gynoecium? _______________ What is the placentation
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last updated 9 January 2004 by