Prosopis alba

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fabales

Familia: Fabaceae
Subfamilia: Caesalpinioideae
Tribus: Mimoseae
Genus: Prosopis
Species: Prosopis alba
Varieties: P. alba var. alba - P. alba var. panta
Name

Prosopis alba Griseb.
References

Abh. Königl. Ges. Wiss. Göttingen 19:83; Pl. lorentz. 35. 1874
USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN) [Online Database]. [1]

Vernacular names
English: algarrobo blanco

Prosopis alba is a South American tree species that grows in central Argentina, the Gran Chaco ecoregion, and part of the Argentine Mesopotamia, as well as Bolivia, Paraguay, and Peru. It is known as algarrobo blanco ('white carob tree') in Spanish. Spanish settlers gave it that name because of its similarity to the European carob tree (Ceratonia siliqua). Other common names come from Guaraní, including ibopé and igopé.

Prosopis alba is a medium-sized tree, measuring between 5 and 15 m (16 and 49 ft), in height and 1 m (3.3 ft) in diameter, though such tall specimens occur very rarely at present. The trunk is short and the treetop is globular, sometimes reaching 10 m (33 ft) in diameter. The bark is thin, brown-grayish in colour, with streaks, and it has tanning properties.

The tree is employed for ornamental and utilitary roadside planting and windbreaks. Its timber, which is rather dense (relative density = 0.76) and difficult to work, is used for doors and floors, for furniture, for paving blocks, shoe lasts and wine casks (where it replaces the European oak). The wood responds well to drying and is therefore valuable for work that requires stable dimensions regardless of humidity. It is also durable for outdoor use.

The flowers are small, greenish-white or yellowish, and bisexual. Pollination, mediated by wind and insects, is allogamous (crossed), since the female reproductive organs are turned active before the male ones.

The fruits are modified seedpods, 20 cm (7.9 in) long, with brown seeds about 7 mm (0.28 in) long. They contain a sweet floury paste (patay), very high in energy, that can be used for fodder or turned into flour for human consumption. In the 1940s a mildly intoxicating beverage called aloja was made from it through fermentation; in turn it was sometimes distilled to produce ethanol. Between half and three quarters of the fruit's weight is sugar.
In a Botanical garden iמ Israel

The tree can reportedly tolerate drought, salt and sand; in fact, it is extremely efficient with regard to water consumption, it produces the most fruits in years of drought and has been successfully introduced in arid terrains. However, it cannot stand even mild frost.

Prosopis alba and other algarrobo species in genus Prosopis, such as algarrobo negro (P. nigra), are often confused or not correctly distinguished in botanical literature; in part this is due to the ease of hybridization of the genus.
References

World Conservation Monitoring Centre (1998). "Prosopis alba". IUCN Red List of Threatened Species. 1998: e.T33953A9824527. doi:10.2305/IUCN.UK.1998.RLTS.T33953A9824527.en. Retrieved 18 November 2021.