Petals have large number of what
Answers
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Certain plant families generally have a specific number of nominal petals, be it any number till 1 to 10 or 12.
The aquatic Cape Pondweed seems to be highly unusual in having but two petals.
The aquatic Utricularia have but two-lipped flowers.
There are also a great many flowers belonging to the mint family which have vertically symmetric two-lipped flowers, flowers such as Red Dead-nettle.
Also many saprophytes such as Red Bartsia and orchids have 2 petals.
No plant that is not aquatic has three petals.
Among those aquatic plants that are three-petalled are Flowering-rush, the Water-plantains, the Frogbit Family, the Waterweed Family, and of course Yellow Iris has three very large petals.
New Zealand Crassula aquatica which anomalously has 4 petals and yet belongs to the Sedum Family which usually have 5 petals but some Sedum have 6 or 7 petals petals