LAB 10: FAMILY STUDIES - LILIOPSIDA (MONOCOTS II)

1.    SUBCLASS IX - ARECIDAE - Araceae - Arisaema
(Jack-in-the-pulpit) - Arales 
     
     Work in pairs.  Obtain an inflorescence and compare with J &
L p. 427 and lecture notes.  Note SPATHE, SPADIX, and highly
reduced flowers.  Species of this genus are monoecious or
dioecious; male flowers are composed of a cluster of nearly sessile
2- to 4-celled anthers opening by terminal slits or pores; female
flowers consist of a 1-celled ovary with a broad stigma and up to
6 ovules.  Some of this preserved material has staminate flowers
and some of it has pistillate flowers.  (A few odd ones have both!)
Observe and draw BOTH types of flower. 

     Examine the key to monocot families and note that it would be
difficult to identify this family if you were not aware of this
specialized and characteristic inflorescence. 

    DRAWINGS:     MALE FLOWER         FEMALE FLOWER              
INFLORESCENCE








2.    SUBCLASS X - ZINGIBERIDAE - Bromeliaceae - Bromeliales

     Examine material on display representing this family.  Note
epiphytic habit, colored bracts, and other characteristics
discussed by J & L p. 440. 

     Key the family in reverse.  That is, start with the family and
go through the key until you reach couplet number 1.  What
characters does the key use to key out the Bromeliaceae? 
                                                 SKETCH 
      1.______________________________________
          
      2.______________________________________
 
      3.______________________________________


     What is the Bromeliad genus found locally?
______________________________


3.  SUBCLASS XI - LILIIDAE - Liliales 
       
     Examine Unknown "A".  Construct a floral formula for this
particular plant: 
     ___________________________________________

     Key to family:
__________________________________________________________

    
_________________________________________________________________
________
     Key this plant to genus (no onion
smell)_______________________________________

    
_________________________________________________________________
______________

     Now consider Unknown "B".  Examine the floral material
carefully.  Construct a floral formula for your specimen.  
                                  ____________________________  Key
to family_______

_________________________________________________________________
___________________

     How does this specimen compare with sample A in regard to
ovary position?

    
_________________________________________________________________
__________

     Note that Jones and Luchsinger (pg. 442) combine the Liliaceae
and Amaryllidaceae, yet the key separates these two taxa as
distinct families.  What criteria are used to make a separation
between the Liliaceae and Amaryllidaceae? 

    
_________________________________________________________________
__________


     DRAW YOUR SAMPLES OF LILIACEAE AND AMARYLLIDACEAE











4.    LILIIDAE - Orchidaceae -Orchidales

     Obtain an orchid flower.  Note the highly modified floral
structure, especially the COLUMN, derived from fused stamens,
style, and stigma.  What is the ovary position?
____________________.  Refer to the diagrams on pages 449 of J & L
and the poster on the board as you dissect your flower.  

     What is a
pollinium?____________________________________________________

     Where have we encountered pollinia
before?______________________________

SKETCH THE FLOWER AND COLUMN OF THE ORCHID: