PRIMULACEAE - Primrose Family
Annual and perennial herbs
Leaves opposite, whorled or basal, simple
Flowers bisexual, often heterostyled
(styles of different length), actinomorphic

Fruit a capsule
Seed with small embryo
30 genera, 1000 species, mostly north temperate
Economic uses - ornamentals
Cyclamen
Lysimachia (Loosestrife)
Primula (Primrose)
Dodecatheon (shooting star)
Diagnostic characteristics: herbs, flowers 5-merous, stamens opposite petals,
heterostylous
OUTCROSSING MECHANISMS
1. Flower morphology
Example - Primula
A. Heterostyly - pins & thrums
B. Pollen-grain size
C. Stigma papilla size

Possible crosses -
pinXthrum only
2. Self-compatibility reaction (biochemical in nature)
IMAGE GALLERY