Floating plants are rare and are of only three types arrowhead, yellow water lily and water knotweed.

So the arrows connect regions that are active at the same time, and the direction of the arrows flows from the region that's active first in time, and the arrowhead goes to the region that's active later.

Obasanjo has made it clear that Atiku Abubakar, the Vice President and the arrowhead of the anti third term coalition, will not succeed him. But this has not stopped Abubakar, a formidable political operator, from launching his presidential bid, despite uncertainty over whether he will fight it out with his boss for control of the PDP machinery or decamp to another political party.