Parkia is a genus of tropical flowering plants in the legume family Fabaceae, placed within the mimosoid clade of the subfamily Caesalpinioideae. The genus comprises roughly 35–40 species of trees distributed across the tropics: approximately four species occur in Africa, around ten in Asia, and about twenty in the Neotropics. Neotropical species were comprehensively revised in 1986, and four additional species were formally described in 2009.
Parkia trees are characterised by their distinctive ball-shaped or pendant flower heads — globose or elongated capitula — which are typically bat- or insect-pollinated. The flowers are often produced at night and attract bats with nectar-rich inflorescences hanging on long peduncles below the canopy. The pods are large and fleshy, and in several species the seeds are enclosed in a starchy or oily pulp used as food.
The genus includes several economically and culturally important species. Parkia biglobosa, the African locust bean, is a cornerstone food tree across the Sahel and West Africa: its fermented seeds are the basis of a pungent condiment (dawadawa/soumbala) used in local cuisines, and its pods yield a sweet edible pulp. Parkia speciosa, the stink bean or twisted cluster bean, is a widely consumed vegetable in Southeast Asia, eaten raw or cooked despite its strong sulfurous odour. Parkia bicolor is another African species used similarly to P. biglobosa. Several Asian species, including Parkia timoriana (tree bean) and Parkia javanica, are also harvested for food or timber.
Distribution
Parkia is pantropical in distribution, with species naturally occurring across three broad regions: roughly four species in sub-Saharan Africa, approximately ten in tropical Asia (from South Asia through Southeast Asia to the Pacific), and around twenty in the Neotropics of Central and South America.
Ecology
Parkia species are trees of tropical lowland forests, gallery forests, savannas, and forest edges. Their ball-shaped inflorescences are adapted for bat pollination (chiropterophily): the pendant flower heads, night-time anthesis, and abundant nectar are characteristic traits that attract frugivorous and nectarivorous bats as primary pollinators. Some species also attract insects. The large pods and seeds are dispersed by mammals and birds.
Cultural Uses
Several Parkia species have long histories of food use across their native ranges. Parkia biglobosa seeds are fermented to produce dawadawa (also called soumbala or nété), a protein-rich condiment central to cuisines across West Africa and the Sahel. The sweet pulp surrounding the seeds is also eaten fresh or dissolved in water as a drink. In Southeast Asia, the seeds of Parkia speciosa (stink bean) are consumed raw, grilled, or stir-fried and are considered a delicacy despite their characteristic sulfurous smell. Other species, including Parkia timoriana, are harvested for edible pods and seeds in parts of Southeast Asia and the Pacific.
