Maria Carolina ("Min") Collins was appointed as assistant to the keeper of the botanical collection at the Transvaal Museum, Miss R. Leendertz*, in September 1907. The museum's annual report for 1907/8 mentions that "her work has been very satisfactory". She left her position in October 1913 to marry Walter C. Holden. They settled in Durban, where she died five years later. There are 244 plant specimens collected by her in the National Botanical Institute, Pretoria, received from the Transvaal Museum. She also contributed butterflies to the museum's collection. The plant species Drosera collinsiae (slakblom) was named in her honour by N.E. Brown*. Her sister, Elizabeth ("Liz") S. Collins, also collected plants for the Transvaal Museum.