| Two species of
Marigold (Calendula) have become naturalised widely. They
mainly differ in size: Garden Marigold (C. officinalis) has
larger flower heads (2-5 cm wide) than Wild Marigold (C. arvensis
- 1-2 cm).
The fruiting stage of Calendula is distinctive - the outer
fruit in the head are crescent shaped and relatively large.
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