?Extinct. (Lambdon, P., & Darlow, A. (2012). Flowering plants & ferns of St Helena. Pisces Publications for St Helena Nature Conservation Group);
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Only grown for food in gardens. (Non-Native Species Workshop (2024) Non-Native Species Workshop for St Helena. Workshop, St Helena, 15-19 January 2024.);
Lambdon, P., & Darlow, A. (2012). Flowering plants & ferns of St Helena. Pisces Publications for St Helena Nature Conservation Group. Pisces Publications for St Helena Nature Conservation Group; Pritchard, S. F. & Bowie, J. (1836). An alphabetical list of indigenous and exotic plants growing on the island of St. Helena. G.J. Pike, Cape Town; Melliss, J.C. (1875). St. Helena: A physical, historical and topographical description of the island, including its geology, fauna, flora and meteorology. L. Reeve & co., London; Williams, R.O. (1980). The Plants of St. Helena. Privately published, Jamestown, St Helena; Non-Native Species Workshop (2024) Non-Native Species Workshop for St Helena. Workshop, St Helena, 15-19 January 2024.;