Acuna Cactus

February 17, 2009

Over the weekend we visited a remote locality for the rare Acuna Cactus, Echinomastus erectocentrus var. acunensis.  After driving for several miles down a 4WD road and hiking up a steep, rugged hill, we reached the hidden cactus garden.

Echinomastus erectocentrus var. acunensis

Echinomastus erectocentrus var. acunensis

The other variety of this species, var. erectocentrus (Needlespine Cactus), grows near our house and is an old friend.  Both cacti are rare, very picky about habitat, and have very small ranges.  I’ve had a page of var. erectocentrus photos on my cactus website for several years, and was very happy to finally add new photos of both cacti and publish the first detailed, fully illustrated comparison of the two as living plants, not as herbarium specimens.  The only thing still missing is a photo of acunensis in bloom, and with luck, I’ll get one this spring. 

Echinomastus erectocentrus webpage:


One Response to “Acuna Cactus”

  1. I have been studying the Florence, AZ population of acunensis for a few years now and prepared an informal but relatively detailed population study for US Fish and Wildlife on that group of plants. I have also visited the Sonoyta, Sonora population. I have yet to see the plants near Coffeepot Mountain nor in Ajo. Beautiful picture of acunensis above. Here is a link to many pictures of Arizona Echinomastus:

    Here is a link to some pics of the Sonoyta plants in flower, at

    Hope you enjoy the photos,


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