wood balcony

Hi all, We have a small.balcony rail that dates from the 1970s and has a wood top bar over a metal frame. We varnish/stain/treat the wood every year, and by July it has peeled off. It is heavily cracked and the cracks are quite deep in places. It also faces south and is in the sun all day and...

We are looking at repairing our balcony and some planks need replacement. One problem is we cannot identify the type of wood. I have attached some photos. Can anyone assist? The wood appears untreated and is a shade of grey (after natural weathering). Failing anyone being able to identify it...