This Argentine charity stamp, issued in 1961 for the Exposición Filatélica Internacional de México (TEMEX-61), features the blossoms of the Lapacho Negro (Tabebuia ipe), a tree native to South America known for its spectacular violet flowers. The design, by Héctor Viola, presents the blooms in fine engraved detail. The denomination is 5 + 5 pesos, where the surcharge supported charitable causes. Printed by the Casa de Moneda (Argentine Mint), this issue highlights both Argentina’s botanical heritage and its participation in international philatelic exhibitions. Today it is a notable piece for collectors of thematic flora stamps and Latin American issues.