120° symmetry
 

I've got these sunflower seedlings - most of which like the one in the
bottom of the picture have two cotyledons and paired leaves.


http://www.skipweasel.pwp.blueyonder...es/trifold.jpg

However, one, as you can see had three cotyledons and has triple leaf
sets. They're exactly like ordinary sunflower leaves - only spaced 120°
round the stem.

Is this unusual in sunflowers? I've never seen it before.

--
"Bother", said Skipweasel as he molished a little jig.