Coffee (plant)

Coffee (plant)
Marcelo Corrêa · CC BY-SA 3.0 · source
Name	Coffee
Regnum	Plantae
Clade1	Angiosperms
Clade2	Eudicots
Order	Gentianales
Familia	Rubiaceae
Genus	Coffea

Coffee (plant)

Coffee is a genus of flowering plants in the family Rubiaceae cultivated worldwide for its seeds, commonly known as coffee beans, which are the primary raw material for the beverage coffee. Cultivation and trade of coffee involve numerous nations, firms, and institutions such as Brazil, Ethiopia, Colombia, Vietnam, and multinational companies including Nestlé and Starbucks. The genus has been central to historical events and cultural movements linked to locations like Yemen, Java (island), Cairo, and the Ottoman Empire.

Taxonomy and species

The genus Coffea comprises over 120 accepted species described by botanists associated with institutions such as the Royal Botanic Gardens, Kew, the Missouri Botanical Garden, and the Smithsonian Institution. Two species dominate global commerce: Coffea arabica (commonly called Arabica) and Coffea canephora (commonly called Robusta), alongside other cultivated or wild species like Coffea liberica, Coffea excelsa, and recently described taxa recorded by researchers at the International Union for Conservation of Nature and the Botanical Society of America. Taxonomic treatments reference authors from the Linnaean Society tradition and revisions published in journals such as Taxon and the Kew Bulletin.

Description and morphology

Coffee species are typically evergreen shrubs or small trees reaching heights documented in floras from Madagascar, Comoros, and Tropical Africa. Leaves are opposite, glossy, and leathery—characters recorded in field guides from the Royal Botanic Gardens, Kew—while axillary clusters of tubular white flowers produce ovoid drupes (often called cherries) containing two seeds. Detailed morphological studies by researchers at the University of São Paulo and the University of Oxford describe stomatal patterns, inflorescence architecture, and seed endosperm structure that distinguish species such as Coffea arabica (tetraploid) from Coffea canephora (diploid). Anatomical and chemical analyses published in the Journal of Experimental Botany link caffeine biosynthesis pathways to genes characterized in laboratory collections at the John Innes Centre.

Distribution and habitat

Wild and cultivated coffee species are native to tropical Africa, the Indian Ocean islands, and parts of Asia. Ethiopia is recognized as a center of diversity and endemism, with montane forests cited in conservation reports by the World Wildlife Fund and the IUCN hosting numerous wild populations. Coffea arabica originally occurred in the Afromontane regions while Coffea canephora ranges include lowland rainforests recorded by expeditions supported by the Royal Geographical Society. Plantation landscapes in Brazil, Colombia, Costa Rica, and Indonesia show adaptations to elevation, rainfall patterns documented by the Food and Agriculture Organization and shade regimes influenced by agroforestry practices promoted by organizations like Conservation International.

Cultivation and propagation

Coffee cultivation involves nursery propagation, vegetative cloning, and seed-based breeding programs coordinated by research centers such as the Coffee Research Institute and the Centro Nacional de Investigaciones de Café. Agronomic practices disseminated through extension services in countries including Kenya, Guatemala, and Peru emphasize planting density, pruning, fertilization, and shade management. Propagation methods include grafting and tissue culture protocols developed at the International Center for Tropical Agriculture and varietal improvement through breeding initiatives at CATIE and national agricultural research systems like Embrapa. Mechanical harvesting, post-harvest logistics, and certification schemes such as Fairtrade and Rainforest Alliance influence production systems.

Uses and processing

Seeds from coffee cherries undergo processing methods—natural (dry), washed (wet), and semi-washed (pulped natural)—documented in manuals issued by SCAA (Specialty Coffee Association) and agricultural agencies of Brazil and Colombia. Processing technologies at facilities operated by cooperatives in Ethiopia and exporters in Vietnam convert green beans for roasting by firms like Illy and Lavazza. Beyond brewing, coffee derivatives appear in products from culinary houses such as Nestlé and cosmetic companies selling extracts; chemical constituents like caffeine and chlorogenic acids have been studied by researchers at Harvard University and the Max Planck Institute.

Pests, diseases, and pests management

Major threats include fungal pathogens such as Hemileia vastatrix (coffee leaf rust) and pests like the coffee berry borer Hypothenemus hampei, both central to studies by the International Coffee Organization and plant health programs at the Food and Agriculture Organization. Disease outbreaks in regions like Central America and Southeast Asia have prompted integrated pest management approaches promoted by the World Bank and research by universities including Cornell University and University of California, Davis. Control measures combine resistant cultivars developed at institutes like CATIE, biological control agents, phytosanitary regulations enforced by agencies such as the USDA, and agroecological practices advocated by Bioversity International.

Conservation and genetic resources

Conservation of wild coffee diversity is coordinated through ex situ collections at botanic gardens like the Royal Botanic Gardens, Kew and seed banks supported by the Global Crop Diversity Trust, alongside in situ protection in protected areas managed by entities such as UNESCO and national parks in Ethiopia and Madagascar. Genetic resource initiatives, including pre-breeding programs at the International Center for Tropical Agriculture and the World Coffee Research consortium, aim to secure germplasm for climate resilience and disease resistance. Red List assessments by the IUCN highlight threatened Coffea taxa, informing policy dialogues at multilateral fora like the Convention on Biological Diversity.

Category:Coffea