For a long time I was puzzled by these very hard seeds which kept turning up in my yard.  I figured out that they were being dropped there by crows.  But I could not determine where the crows were getting them.

Then one day, not far from my house, I discovered this tree with fruit on, and under it.  And then I learned that it is a macadamia nut tree.  Introduced from Australia.

The next time it bloomed, I took pictures of its flowers.  They are rather unusual.

Here are the macadamia fruit hanging on the tree.

When ripe the husk splits and lets the nut out.

Crows know there is something good inside, but they don't have hammers.  After trying everything they can to open a nut, they finally abandon it, sometimes in my yard.

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