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Strychnos madagascariensis
''Strychnos madagascariensis'' or Muquaqua is an African tropical and sub-tropical tree belonging to the Loganiaceae family. Usually about 6m tall and often multi-stemmed with a spreading, irregular crown, it occurs in open woodland, rocky places, riverine fringes and coastal forest. Bark mostly pale grey with white and dark grey patches, smooth, occasionally powdery. Branches are unarmed though short, rigid lateral shoots may resemble spines. The opposite leaves - often tufted - are smooth to hairy, leathery, elliptic to circular, shiny dark green above and markedly paler below. Occurring in KwaZulu-Natal, Mozambique, Transvaal, and further north to Zimbabwe, Botswana, Malawi, Zambia, Tanzania, Tropical Africa and the western side of Madagascar.〔http://plants.jstor.org/flora/fz5563〕〔http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?451201〕
Flowers are small and greenish-yellow in clusters of 1-4 flowers. Fruit is near-spherical with a thick, woody shell, about 8 cm in diameter and distinctively blue-green in colour when young, turning yellow when mature. The tightly-packed poisonous seeds are covered in an orange, fleshy, edible pulp rich in citric acid and iridoids - the pulp is relished by humans and baboons. Iridoids are primarily a defense against herbivory and pathogens, and are characterized by a bitter taste.
The tree is a close relative of ''Strychnos nux-vomica'', the seed of which is a source of strychnine. Fishing with poisonous plants used to be a common practice in Africa, and though outlawed is still employed in remote areas. As with other species of ''Strychnos'' the seeds are pulverised and thrown into a pool or dammed sections of a stream, affected fish soon rising to the surface, while subsequent cooking breaks down the poison.〔http://www.plantzafrica.com/plantqrs/strychnosmad.htm〕 Oils extracted from the inner skin of the fruit have a high oleic acid content.〔("Annotated Bibliography of Strychnos (1990-2004)" )〕
==Synonyms==
*''Strychnos baronii'' Baker
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