Look at the end grain Graham, it is a feature that is between the rings (it is formed by the pores that the water etc travel up when the tree is living) it is less distinct in this picture (and possibly this type of tree) than say Laburnum or Iroko.
In the square Acacia bowls that Woodmonkey put up you can see the pore structure is similar, the zig zag pattern is less distinct (in reality it may not even be a true zigzag as such as it is more an optical illusion in the way the pores are arranged and they LOOK zigzaged, but actually close observation shows this to be variable)
But the overall appearance of the Legume timbers is strikingly similar in this regard particularly the end grain. In Laburnum and Iroko the illusion of the zigzag nature is more apparent, also Gorse is pretty distinct too.
In the image I linked too the feature shows best on the lower right side of the log where there is a slight bulge giving a wide gap between the rings in a couple of spots, the pores are closer to the classic appearance there.