Q. I need to replace this acacia tree; in a very shaded area of
our yard. Is it a shoestring acacia?
A. Probably not. I posted the Shoestring Acacia flowers below. It is native to Australia and commonly flowers in mid winter in Las Vegas, north of the equator.
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| Shoestring Acacia flowers |
Most likely it is called Mulga or Mulga Acacia. Check out Mulga aneura from this website in Phoenix/Tempe.
http://www.public.asu.edu/~camartin/plants/Plant%20html%20files/acaciaaneura.html