Glaucous Cacao (Theobroma glaucum)

Cacao azul Cacao de monte Cupuaí

Theobroma glaucum: The Blue-Leaved Wild Cacao

Characterized by the distinctive bluish-grey undertones of its foliage, Theobroma glaucum thrives in the humid evergreen forests of the upper Amazon basin. This medium-sized tree forms part of the rich understory layer in pristine rainforests.

The striking appearance of its leaves makes it easily identifiable among other wild relatives of the cocoa plant. It contributes to the local biodiversity by offering shelter and food to various tropical birds and mammals.

Taxonomy

  • ∟ царство Plantae
  • ∟ division Tracheophytes (Vascular Plants)
  • ∟ subdivision Spermatophytes (Seed plants)
  • ∟ Angiosperms
  • ∟ mesangiosperms (Core angiosperms)
  • ∟ eudicots
  • ∟ Superrosids
  • ∟ rosids
  • ∟ malvids
  • ∟ order Malvales
  • ∟ family Malvaceae
  • ∟ subfamily Byttnerioideae
  • ∟ genus Theobroma (Cacao trees)
  • ∟ species Theobroma glaucum (Glaucous Cacao)

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Morphology

Growing to a height of about 8 meters, the tree features slender branches covered with rusty-brown hairs. The leaves are simple, oblong-elliptic, and covered underneath with a glaucous, waxy layer that gives them a pale, bluish cast.

Its small flowers are borne in clusters on the branches, showing yellow or purple-brown petals. The fruit is an oblong, woody pod up to 10 centimeters long, featuring a hard, brownish-green shell when mature.

Inside the pod, the seeds are surrounded by an abundant, acidic, white pulp that releases a strong, fruity aroma. The seed coat is relatively hard compared to cultivated cacao species.

Flowering season

The tree typically blooms late in the year, with peak flowering observed from September to December.

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Applications

Local communities harvest the wild pods to extract the acidic pulp, which is used to make juices, jellies, and desserts. The pleasant acidity provides a refreshing flavor in tropical climates.

The seeds are occasionally used to extract fats for local cosmetic applications or folk medicine. Due to its unique leaf color, it holds potential as an ornamental plant in tropical botanical gardens.

Interesting facts

The German botanist Hermann Karsten first described the species in 1857. The name glaucum refers to the glaucous, waxy coating on the underside of its leaves.

A notable botanical synonym is Theobroma caleodesme, described by German botanist Ludwig Diels in 1939. Unlike commercial cacao, this species has not been domesticated, remaining entirely wild.

Geography of distribution

  • Peru
  • Colombia
  • Ecuador
  • Brazil

Sources

  • Plants of the World Online (POWO) - Royal Botanic Gardens, Kew
  • Tropicos - Missouri Botanical Garden
  • World Flora Online (WFO) Consortium

Technical Information

External Databases: GBIF, POWO, Tropicos

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