Essential organs. 
I. Androecium (stamens), homology. 
2. Gynoecium (carpels), homology. 
Purpose of the flower. 
Stamens (=microsporophylls) are organs for production of 
pollen, or pollenspores (—microspores. ) 
Stalk(—filament) not always present. 
Anther. 
Anther sac, or pollen sac (—microsporangium). 
Pistil consists of ovary (contains the ovules), style (not always 
present), stigma. 
A simple pistil=a carpel—macrosporophyll. 
A compound pistil—several carpels joined. 
Ovule—macrosporangium. 
2.. Kinds of Flowers. 
Complete flowers. 
Incomplete flowers. 
Apetalous flowers. 
Naked flowers. 
Staminate flowers. 
Pistillate flowers. 
Sterile flowers. 
Perfect flowers (hermaphrodite). 
Imperfect or diclinous flowers. 
Monoecious flowers. 
Dioecious flowers. 
Polygamous flowers. 
Forms of flowers, regular or irregular. 
Forms of corolla, 
Rotate (potato, tomato, bittersweet). 
Salver-shaped (phlox). 
Campanulate (hare-bell or Campanula). 
Tubular (trumpet flower or disk florets of com- 
posites). 
Butterfly or papilionaceous (pea, bean). 
Labiate (flowers of mint family). 
Personate or masked (toad flax, or snap dragon). 
Ligulate, or strap-shaped (dandelion, chicory, or 
ray florets of other composites). 
BOYD o 
At oye 
7 
