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Desert marigold

The days are getting shorter and the mornings colder, but our late rains have caused the Desert Marigolds to bloom. The hackberry bushes have orange berries and the mesquite’s have lemon yellow bunches of pods. The leaves of the hackberry bushes are being attacked by a parasite that leaves them curled up, edges stuck together, to make a pouch with a white powder inside.

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About Bill McCallum

I was born in Australia and came to the United States to pursue a Ph. D. in mathematics at Harvard University, met my wife, and never went back. I am a professor at the University of Arizona, working in number theory and mathematics education.


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