They aren't supposed
to do that!
Mammillaria dixanthocentron Backeberg is
described as columnar and simple, to 20cm tall and 8cm diameter (Backeberg
1963). Someone
forgot to mention these details to the plant shown below! This
wonderfully spiny 10 year old was 25cm tall and 10cm diameter before it
decided to go with a dichotomous lifestyle.
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