Some Planar curves:

The formulas are here:
https://people.reed.edu/~jerry/Clover/cloverexcerpt.pdf

For the 3 leaf clover, 2*PI was used. Divider was 50. Count for one half leaf was 478. These numbers affect each other. (For PI, Count would be 956, but the gap near origin is Joined with Join command.)
Rebuild was at 0.002 tolerance, which uses just a few nurbs points.
Mirror of the half leaf was done, and then Join was done, leaving the curve open near the origin.
Then circular array was done, and Join again, then planar.

5 leaf clover used PI, divide by 50, and 574 for count for half leaf. Then Rebuild etc., as above.

- Brian

4 leaf would be a 2 leaf Lemniscate, but could be 4 leaf with circular array...

3 leaf clover:


5 leaf clover:


CloverNode1of2


CloverNode2of2

The 4 leaf clover works well with 2PI, divider of 50, and count of 359.
The MoI Mesh angle was temporarily reduced from 10 to 1, for the planar to visibly fill up the closed curve.
It is actually two lemniscates, (open near the center).

- Brian

As per the paper, the two leaf clover is a circle (or 2), and the one leaf clover is a cardioid.
- Brian