During his brief visit to Namibia in 2010 world expert on the control of invasive cacti Helmuth Zimmermann from Pretoria noted 23 invasive cactus species, the most dangerous of which are listed below.
Object Details Publication not determined Note at lower right, "Examined for The Cactaceae, Carnegie Institute of Washington", signed, "Lith. Anst. V. August Kurth Leipzig" and" R.A. Philippi, del." ...
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