Nomenclatural revision of Portulaca names (Portulacaceae) published by Gustav Albert Peter based on specimens collected in Tanzania

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Summary The German botanist Gustav Albert Peter is known for his extensive botanical work in South and East Africa. As a result of these expeditions, Peter described eleven species of Portulaca from present-day Tanzania in his Flora von Deutsch-Ostafrika . Many of these names lack typification or have ambiguous type designations. In this study, we review the protologues and original material housed at the B herbarium related to Tanzanian Portulaca names proposed by Peter. We designate five lectotypes and two second-step lectotypes following the rules of the International Code of Nomenclature.