Background. Many studies have been undertaken on the medicinal values of Erythrina abyssinica Lam. ex DC. (Fabaceae). The details, however, are highly fragmented in different journals, libraries, and other publication media. This study was therefore conducted to provide a comprehensive report on its ethnobotany, ethnomedicinal uses, phytochemicals, and the available pharmacological evidence supporting its efficacy and safety in traditional medicine. Method. We collected data using a PROSPERO registered systematic review protocol on the ethnobotany, phytochemistry, and ethnopharmacology of Erythrina abyssinica from 132 reports that were retrieved from electronic databases. Documented local names, morphology, growth habit and habitat, ethnomedicinal and nonmedicinal uses, diseases treated, parts used, method of preparation and administration, extraction and chemical identity of isolated compounds, and efficacy and toxicity of extracts and isolated compounds were captured. Numerical data were summarized into means, percentages, and frequencies and presented as graphs and tables. Results. Erythrina abyssinica is harvested by traditional herbal medicine practitioners in East, Central, and South African communities to prepare herbal remedies for various human and livestock ailments. These include bacterial and fungal infections, tuberculosis, malaria, HIV/AIDS, diarrhea, cancer, meningitis, inflammatory diseases, urinary tract infections, wounds, diabetes mellitus, and skin and soft tissue injuries. Different extracts and phytochemicals from parts of E. abyssinica have been scientifically proven to possess anti-inflammatory, antibacterial, antioxidant, antiplasmodial, antiproliferative, antifungal, antimycobacterial, antidiarrheal, anti-HIV 1, antidiabetic, and antiobesity activities. This versatile pharmacological activity is due to the abundant flavonoids, alkaloids, and terpenoids present in its different parts. Conclusion. Erythrina abyssinica is an important ethnomedicinal plant in Africa harboring useful pharmacologically active phytochemicals against various diseases with significant efficacies and minimal toxicity to mammalian cells. Therefore, this plant should be conserved and its potential to provide novel molecules against diseases be explored further. Clinical trials that evaluate the efficacy and safety of extracts and isolated compounds from E. abyssinica are recommended.
1. Introduction
Erythrina abyssinica Lam. ex DC. (Fabaceae) is an important medicinal plant as evidenced by the existence of its names in various local languages and high frequency of citation in ethnobotanical surveys [1–4]. The genus Erythrina derives from the Greek word “erythros,” translated to mean red (a reflection of the showy red flowers of its various species). The epithet ‘‘abyssinica’’ means ‘‘from Ethiopia’’ [5]. The Erythrina genus houses at least 120 species distributed mainly in tropical and subtropical zones [6]. Plants in this genus are usually referred to as “coral trees” due to their red flowers and branches that resemble the shape of sea coral [7]. Erythrina abyssinica is a deciduous leguminous tree native to East Africa but also found in Central and South Africa [8, 9]. Tropical Asia and Central America have E. abyssinica as an exotic species. The common English names of E. abyssinica are coral tree, Uganda coral, kaffir boom, erythrina, flame tree, red-hot-poker tree, and lucky-bean tree [10]. Some of the local names used across indigenous communities are summarized in Table 1.
Folk name (local language)
Country
Authors
Ejjirikiti (Luganda), Murinzi, Kiko Omoko/Echuko (Rutoro, Rukonzo), Oluo (Lugbara), Kisoro, Lochoro, Oding, Loting (Acholi), Kikiri (Kwamba), Engosorot (Ateso), Olawu (Madi), Koli (Jopadhola), Owila kot (Lango), Muyirikiti, Ekilama (Lusoga), Cheroguru, Muragolo (Lugishu), Mutembetembe (Lugwe), Bwiko (Lukiga), Kaborte (Sebei), Kiko, Muko (Lunyangkore, Lutoro), Mudongodongo, Mukobe (Lunyuli)
Uganda
[2, 3, 10–15]
Omotembe (Kisii), Muhuti (Kikuyu), Ekirikiti or Ol-Goroshe (Maasai), Muuti (Meru), Kivuti or Muvuti (Kamba), Mulungu (Taita), Mwamba ngoma, Mbamba ngoma, Muhuti, Mjafari or Mwamba (Kiswahili), Kumurembei (Luhya)
Kenya
[10, 16–19]
Qanqari (Iraqw), Mriri (Chagga), Muhemi (Hehe), and Muungu (Pare), Kisebhe (Rungwe)
Tanzania
[20–22]
Kuara, Korra, Korch (Amharic)
Ethiopia
[10]
Umuko (Lunyarwanda)
Rwanda
[23–26]
Dus (Arabic), Hab al Arous
Sudan, South Sudan
[10, 27, 28]
Chisunga (Lunda)
Democratic Republic of Congo
[10]
Mulunku (Chokwe)
Angola
[4]
Mulunguti, Mwale (Nyanja)
Mozambique, Zimbabwe, Zambia, Malawi
[10]
Mulunguti (Bemba, Tongan)
Zambia, Mozambique, Zimbabwe
[5, 10]
Mutiti (Shona)
Zimbabwe
[5]
Suwawue, Soaueh (Tigrigna)
Eritrea, Ethiopia
[10, 29]