Moller, Michael, et al. “The Living Collection at the Royal Botanic Garden Edinburgh Illustrates the Floral Diversity in Streptocarpus (Gesneriaceae)”. Sibbaldia: The International Journal of Botanic Garden Horticulture, no. 17, Feb. 2019, pp. 155-77, doi:10.24823/Sibbaldia.2019.272.