Grusonia aggeria

Another obnoxious dog cholla, this one found in the Big Bend region and having terete spines. The awfulness of the rest of the plant is, however, rather offset by the flowers.

Plant habit with flower, Dog Flats at Big Bend National Park, 16 Apr 2007.

A flower, Dog Flats at BBNP, 16 Apr 2007.

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