## 5 Conclusions  
Currently, the negative effects of unified and intensive agriculture (e.g., loss of biodiversity, adaptability of crop to climate change, growing reliance of some countries on commodity import) are of growing concern. One of the solutions to mitigate them is to support biodiversity in agriculture by revealing and promotion of the potential of traditional but nowadays underused crop. The study provides much-needed new information on chemical composition of oils and cakes obtained from oil-bearing plants from Western Province, Zambia. The character of fatty acid composition of _S. rautanenii_ and _P. curatellifolia_ oils defined them as drying oils, whereas _O. serurlata_ appeared to be of a non-drying (rancid-resistant) character. Based on the obtained nutritional data, it is evident that all the tested species showed the potential of being introduced into a wide spectrum of industries, especially food industry as salad or cooking oil or food supplement or in technical industry for the manufacturing of soaps, paints, and varnishes, and in the pharmaceutical industry as carrier oils. Because _O. serrulata_ contains relatively large quantities of \(\alpha\)-tocopherols and pigments, and is resistant to rancidity, it especially deserves greater research attention. The nutrient-dense oil cakes of the tested species are also promising sources of animal feed. Further studies are needed to reveal other qualitative properties, such as iodine, peroxide, saponification values, etc., of these oils and verify their safety for human and animal consumption. Last but not least, more data to evaluate environmental and socio-economic aspects of their cultivation, harvest and processing are needed.  
Conceptualization, A.F., J.T., A.M., Z.P., M.N. ([PERSON]), M.N. ([PERSON]); sample collection: J.T., A.M., Z.P., M.N. ([PERSON]), M.N. ([PERSON]); herbarium specimen authentication, M.N. ([PERSON]), M.N. ([PERSON]); methodology, A.F., Z.K., B.R., O.F., K.V., O.D.; formal analysis, A.F. and J.T.; investigation, A.F., J.T., A.M., Z.P., M.N. ([PERSON]), M.N. ([PERSON]), resources, V.V.; data curation, A.F. and J.T.; writing--original draft preparation, A.F. and J.T.; writing--review and editing, J.T., V.V., Z.P.; supervision, J.T. and V.V.; project administration, V.V., funding acquisition, V.V. All authors have read and agreed to the published version of the manuscript. Deep appreciation also goes to prof. [PERSON] for his linguistic revision of the final manuscript.  
This work was supported by development programs of the Ministry of Foreign Affairs of the Czech Republic and the Czech Development Agency (Registration No.: ZM-2018-005-DO-31120 and DF-2018-023-DO-11420), METROFOD-CZ research infrastructure project (MEYS Grant No.: LM2018100), NutRisk research program (Project No.: CZ.02.1.01/0.0/0.0/16_019/000845), and Internal Grant Agency of the Faculty of Tropical Agric Sciences, Czech University of Life Sciences Prague (Project No.: CIGA 20185004 and IGA 20195005).  
Not applicable.  
Data availability Statement: Data is contained within the article.  
We are very grateful to employees of the Caritas Czech Republic, Mongu Office in Zambia, namely, [PERSON], [PERSON], [PERSON], and [PERSON], for their generous hospitality, for helping to organize our stay in Zambia, for providing their facilities and assistance with the gathering of ethnobotanical information and sample collection.  
The authors declare no conflict of interest.  
Samples of the compounds are not available from the authors.