BioStor
 | An Analysis of the Flora of Southern Africa: Its Characteristics, Relationships, and Orgins Peter Goldblati (1978) Annals of the Missouri Botanical Garden 65: 369-436 |
 | Composition, Origin, and Affinities of the Madagascan Vascular Flora Jean-F Leroy (1978) Annals of the Missouri Botanical Garden 65: 535-589 |
 | Phylogenetic Assessment and Revised Circumscription of Cistanthe Spach (Portulacaceae) Mark A Hershkovitz (1991) Annals of the Missouri Botanical Garden 78: 1009-1021 |
 | Leaf Morphology of Cistanthe Spach (Portulacaceae) Mark A Hershkovitz (1991) Annals of the Missouri Botanical Garden 78: 1022-1060 |