Second looks like a weedy Amaranthus.

Third could be Wedelia trilobata.

Where are these growing geographically? And please can you take a view of the last one not taken from above and showing the stems? Are there white leaves/petals or is that just the light? Also a view of the whole plant with a scale.

The second and third sure looks like it. Normally I've seen the last plant at the corner of the Bungalow walls. No, there are no white leaves or petals, that is the light reflecting. Thanks for the reply =)

By geographically located I meant where on the planet rather than where on your property.

Agree that the first appears to be Callistemon, Bottle Brush tree. I saw a lot of that planted along highways & roads in SoCal, it seems well adapted to warm arid climates.

The second looks like wild amaranth, a.k.a. pigweed.

I'm living near a seaside in karachi, Pakistan. The leaves look similar to conocarpus as there are lots of conocarpus trees here, but i'm not sure if that's the same plant.