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)

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