Eucalyptus spp. of the family Myratceae. There are over 30 species from the genus Eucalyptus that have stringybark as all or part of one or more of their common names and I have no idea which of them are represented on this page. They all appear to be native to Australia but some apparently grow in South Africa as well.
web pics:
plank --- clearly with a light figure, although not listed as such
