Arizona has some fascinating uses of line in the natural landscape. Here are a few examples.
Here is a proud cactus who sits outside my Carniceria – I loved the contrast so much I had to make it into an art print.
This tree draws a fantastic line at my local park…
And these radial lines are interesting in their interplay. They are pines from that same park.
These are lines courtesy of my acacia tree, painted against the summer sky.
Mindflight 
I like that last shot. Your first one reminds me of my response to last week’s theme. 🙂 Cacti have a beauty all their own, don’t they?
janet
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Oh yes, they definitely do. I love cacti! I’ll go check out your post.
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