Résumé
Suivant les conditions climatiques, c’est un arbuste de 1 m à 1,50 m ou un arbre ramifié pouvant atteindre 8 m, au Maghreb, et même plus, dans les régions tropicales. Ses tiges creuses et souples portent un feuillage persistant, d’un vert profond, brillant, constitué de grandes feuilles palmées pouvant dépasser 50 cm de large. Portées par de longs pétioles, elles sont profondément découpées en 5 à 12 lobes pointus et finement dentés. Certaines variétés ornementales ont les feuilles et les pétioles de couleur rouge. Dans la région méditerranéenne, le ricin fleurit en été et en automne. Les fleurs sont groupées en grappes particulières: les fleurs inférieures, semblables à de petits arbres jaunes, sont des fleurs mâles formées, chacune, d’environ mille étamines au pollen très allergisant; les fleurs supérieures, sans pétales, portent un seul ovaire surmonté de longs filaments rouges (photo 41). En décembre, le fruit arrive à maturité, c’est une capsule épineuse à trois loges renfermant chacune une graine qu’elle libère par dessiccation. Ricinus est le nom latin de la tique du chien car la graine ressemble tout à fait à ce parasite (photo 42).
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Hammiche, V., Merad, R., Azzouz, M. (2013). Ricin. In: Plantes toxiques à usage médicinal du pourtour méditerranéen. Collection Phytothérapie pratique. Springer, Paris. https://doi.org/10.1007/978-2-8178-0375-3_28
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