Flora of Barro Colorado Island

Bixa orellana

L., Sp. Pl. 512. 1753

Achote, Achiote, Anatto

Shrub or small tree, 1.5-8 (15) m tall; trunk to 10 (15) cm dbh; branchlets reddish-brown. Stipules narrowly ovate, ca 1 cm long, caducous; petioles slender, 2-10 (14) cm long, slightly enlarged at apex; blades ovate or ovate­-lanceolate, acuminate, rounded to truncate or cordate at base, 5-27 cm long, 3-18 cm wide, glabrous or sparsely lepidote above, densely lepidote below, the scales minute, reddish-brown; palmate veins at base 5. Panicles termi­nal, variable in size, mostly 5-15 cm long; inflorescence branches, pedicels, and calyces densely reddish-brown-­lepidote outside; pedicels to 1 cm long, with 5 conspic­uous glands below calyx; sepals 5, orbicular, ca 1 cm diam, concave; petals 5, obovate, 2-3 cm long, l-2 cm wide, white (rarely pinkish); stamens many, 1-1.5 cm long; filaments slender, white, glabrous; anthers yellow, horseshoe-shaped, 1-1.5 mm long; ovary globose to pyri­form, densely to sparsely bristly; style 1-1.5 cm long. Capsules variable in size, shape, and indument through­out the species' range, usually ± globose to ovoid, 1.5-4.5 cm long, brown to red, with sparse to dense, short, flex­ible spines; seeds many, ± irregular, red, ca 5 mm long, the testa fleshy. Croat 7875,12294.

Occasional, along the shore. Flowers from September to February (sometimes from August). The fruits mature from January to June, with old dehisced capsules hanging on as late as September.

In Costa Rica bees are the most common visitors and presumed pollinators, especially Eulaema (D. Janzen, pers. comm.), Xylocopa, Trigona, and Melipona     (Heit­haus, 1973). In Ecuador the flowers are visited by female Eulaema cingulata, E. polychroma, E. homichlora, and E. meriana for pollen (Dodson & Frymire, 1961).

The spines on the fruits are not functional in epizoo­chorous dispersal, but probably prevent the fruits from being eaten prematurely.

A red condiment and cosmetic is obtained from the seeds (Duke, 1968).

Throughout the tropics and subtropics of the world. In Panama, from tropical moist forest in all provinces, from premontane moist forest in Los Santos and Panama, from premontane wet forest in Panama (Chimán), and from tropical wet forest in Colón.

Photos from STRI Digital Archive

  • Bixa orellana
  • Bixa orellana
  • Bixa orellana
  • Bixa orellana Flower
  • Bixa orellana Fruit
  • Bixa orellana Flower Leaf
  • Bixa orellana Flower Leaf
  • Bixa orellana Fruit Leaf
  • Bixa orellana Leaf
  • Bixa orellana