Native from eastern USA to South America. Grows as a weed but is also cultivated
for the leaves, which are eaten like Spinach. Amaranthus become poisonous if grown on nutrient
rich soils (e.g. on compost heaps and in heavily fertilised soil) because under
these conditions they accumulate dangerous levels of oxalates.
Native to Africa
but is now widespread in tropical and subtropical regions of the World. It
is a nutritious green leafy vegetable and is harvested from wild populations
and is also cultivated for food.
Native to Africa, including southern Africa. It is an
important commercial crop in Africa and is also grown as a subsistence crop.
Besides the seeds, the leaves and young pods are also eaten and are
van Wyk, B.-E. & Gericke, N. 2000. People's
Plants. A Guide to Useful Plants of Southern Africa. Briza Publications,