Norlindh, T. 1943: Studies in the Calenduleae. Vol. I. Monograph of the genera Dimorphotheca, Castalis, Osteospermum, Gibbaria and Chrysanthemoides. Gleerup, Lund.

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Norlindh, T. 1943: Studies in the Calenduleae. Vol. I. Monograph of the genera Dimorphotheca, Castalis, Osteospermum, Gibbaria and Chrysanthemoides. Gleerup, Lund.