| Conservation status= 3
}}
[[File:Map Calpocalyx heitzii.gif|thumb|distribution in Africa (wild)]][[File:Linedrawing Calpocalyx heitzii.gif|thumb|1, base of bole; 2, leaf; 3, inflorescence; 4, fruit. Redrawn and adapted by Achmad Satiri Nurhaman]]
[[File:Calpocalyx heitzii Piste dans forêt Cameroun LETOUZEY CIRAD.jpg|thumb|road in Calpocalyx forest, Cameroon]]
[[File:Calpocalyx heitzii xs A. Campbell - P.E. Gasson.jpg|thumb|wood in transverse section]]
== Description ==
*Medium-sized to fairly large tree up to 35 m tall; bole straight, cylindrical, up to 90 cm in diameter, with steep buttresses; bark grey to greyish brown, with irregular ridges forming a reticulate pattern, inner bark fibrous, pinkish-brown; branches often hollow. *Leaves alternate, bipinnately compound with a single pair of pinnae; stipules linear, caducous; petiole up to 13 cm long, shortly hairy, with large gland at apex on upper side; axes of pinnae (17–)30–52 cm long; leaflets in 8–15 pairs per pinna, opposite, oblong-lanceolate to narrowly elliptical, up to 15 cm × 3.5 cm, acuminate, papery, glabrous. *Inflorescence an axillary pendent spike 6–15 cm long, many-flowered. *Flowers bisexual, regular, 5-merous, small, sessile, slightly hairy; calyx campanulate, c. 2 mm long, shortly toothed; petals fused at base, c. 4 mm long, whitish yellow to pale brown; stamens 10, free, longer than petals, with glands at apex; ovary superior, slightly stalked, hairy, 1-celled, style long and slender. *Fruit an obliquely obovoid pod up to 20 cm × 4.5 cm, strongly flattened, long-attenuate at base, obtuse at apex, woody, brown, 2-valved, 6– 8-seeded. *Seeds angular, flattened. *Seedling with epigeal germination.
== Other botanical information ==
*Mineral inclusions: 136: prismatic crystals present; 142: prismatic crystals in chambered axial parenchyma cells.
{{right|(N.P. Mollel, P. Détienne & E.A. Wheeler)}}
== Growth and development ==
== Author(s) ==
* R.H.M.J. Lemmens , PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
== Correct citation of this article ==
Lemmens, R.H.M.J., 2006. '''Calpocalyx heitzii''' Pellegr. [Internet] Record from PROTA4U. In: Louppe, D., Oteng-Amoako, A.A. & Brink, M. (Editors). PROTA (Plant Resources of Tropical Africa / Ressources végétales de l’Afrique tropicale), Wageningen, Netherlands. <http://www.prota4u.org/search.asp>. Accessed {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}}.