Melocactus violaceus

References

1. [1]The genus Melocactus (Cactaceae) in Central and South America — Taylor N.P. · 1991 ↩︎
2. [2]IUCN Red List of Threatened Species — http://www.iucnredlist.org/ ↩︎A list of plants under threat and facing possible extinction, usually with brief details of the threats and information on habitat.
3. [3]Diccionario das Plantas Uteis do Brasil — Correa M.P. · Imprensa Nacional; Rio de Janeiro · 1926 ↩︎A massive work in 6 volumes giving details of the various uses of Brazilian plants.
4. [4]Medicinal Plants of Brazil — Mors W.B.; Rizzini C.T.; Pereira N.A. · Reference Publications; Michigan. · 2000 · ISBN 0-917256-42-5 ↩︎An extremely concise book, listing approximately 1,500 species and varieties of plants with their botanical name, common name in Brazil, regions in Brazil where the plant is found, a brief list of uses and any medically active compounds in the plant.