Mon 3 May 2021 03.00 EDT Last modified on Wed 5 May 2021 10.46 EDT In May 2020, 10mm of rain fell at Sendelingsdrif Rest Camp in South Africaâs most north-westerly corner. After enduring nine years of almost zero rain, Pieter van Wyk, a 32-year-old self-taught botanist who heads up the Richtersveld national parkâs nursery, was elated to see several species flower for the first time in almost a decade. The rain, including 200mm on the nearby mountains, was a welcome respite for the world heritage siteâs flora and fauna. His joy, however, was short-lived. While the rain gave a temporary lease of life to some annuals and bulbs in the |Ai-|Ais/Richtersveld transfrontier park, it did little to alter the fact that scores of species, especially large succulent plants such as aloes, are in peril. A study to be published by Van Wyk and others shows that 85% of the population of the distinctive Pearsonâs aloe (