Overview
The Christmas Orchid (Cattleya trianae), known across South America as the ‘Flor de Mayo,’ is one of the most celebrated and regal orchids in the world. Officially chosen in 1936 as the national flower of Colombia, this magnificent unifoliate Cattleya is endemic strictly to the warm, mist-shrouded river valleys and mountain slopes of the Upper Magdalena River basin. Blooming naturally in mid-winter between December and January—earning its widespread common name—its colossal, fragrant, crystalline blooms represent the pinnacle of classical orchid royalty.
Biology and Physical Characteristics
Cattleya trianae produces stout, club-shaped, grooved pseudobulbs that each support a single thick, rigid, oblong-elliptic leathery leaf. In mid-winter, a protective floral sheath at the apex of the pseudobulb opens to unleash an inflorescence bearing two to five colossal blossoms spanning up to eight inches across. The sepals and expansive petals display a delicate palette ranging from crystalline white to soft lavender-pink. The trumpet-shaped labellum features a velvety, wavy margin with an intense crimson-magenta mid-lobe, beautifully framed by a glowing golden-yellow throat that guides visiting pollinators toward the nectarless spur.
Behavior and Ecology
In its native montane riverine habitat, Cattleya trianae grows as an epiphyte firmly anchored to the rough bark of mature trees, particularly native Guamo (Inga) and walnut trees, often suspended 30 to 60 feet above the ground. The flowers produce a rich, complex sweet floral perfume during warm morning hours, attracting large solitary female anthophorid and euglossine bees. The bees land on the sturdy, ruffled lip and crawl toward the golden throat; as they enter the tight floral tube, their thoraxes press against the sticky rostellum, securing the pollinia for cross-pollination. The thick pseudobulbs store ample water, enabling the plant to endure brief seasonal dry spells without losing vigor.
Conservation and Human Impact
Cattleya trianae is classified as Endangered by the IUCN, having suffered profound declines across its historical Magdalena Valley range. Decades of rampant deforestation for coffee cultivation, cattle pasture expansion, and commercial dam construction inundated large tracts of prime riverine habitat. Historically, millions of wild plants were stripped from forests by commercial exporters during the 19th and early 20th centuries. Today, wild specimens are safeguarded under strict CITES Appendix I regulations, and Colombian conservation agencies maintain guarded micro-reserves alongside scientific breeding banks to replenish restored Andean forest corridors.
Interesting Factoid
Cattleya trianae was selected as the national flower of Colombia because the central lip of the blossom combines yellow, blue-violet, and red—the three symbolic colors of the Colombian national flag.
Last updated: October 2026