Two Welwitschias (one male and one female), the rare and endangered desert plant discovered in 1859 by the Austrian Friedrich Welwitsch.
His papers on the ecology, morphology and embryology of Welwitschia, led to a Cantabrigian DSc in 1907, which in turn led to a study of the closely related Gnetum, to which end he went on a collecting expedition to Angola in 1909.
"Cactarium" greenhouse collections include: cacti and succulents, with caudiciform species exhibiting thickened root crowns, many species of Asclepiads, Aztecia, Gymnocalycium, Alstromeria, Euphorbia, and Ferocactus, plus two fine examples of Welwitschia mirabilis from Namibian deserts.