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Nature's turnbuckle | by John W Little
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Nature's turnbuckle

Marah gilensis, or Gila manroot, Santa Catalina mountains, north of Tucson. This remarkable supporting appendage, or tendril, has two useful features. It can act as a spring to cushion the movement of the plant or its support (mesquite in this case), and it can lengthen or shorten, just like a turnbuckle in a screen door or a gate, by rotating the center portion about its axis. Note that the two helical portions have opposite pitch--the left and right ones are left-handed and right-handed (like DNA), respectively.

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Taken on February 27, 2017