Camellia is a genus of flowering plants in the tea family (Theaceae), comprising more than 220 described species — of which roughly 187 are currently recognized — native to the tropical and subtropical regions of eastern and southern Asia, from the Himalayas eastward through southern China to Japan and Indonesia. The genus was established by Carl Linnaeus in 1753 in Species Plantarum and is placed in the order Ericales.
Camellias are evergreen shrubs or small trees, typically reaching 10 to 15 metres in height, with a few species growing larger. Their alternate, leathery leaves have serrate or, more rarely, entire margins and persist through the year, giving the plants their characteristic dense, glossy crown. The flowers are the genus's most celebrated feature: usually showy, 1 to 12 centimetres across, with five to nine petals in shades that range from pure white through soft pink to deep red, and centred on a conspicuous bouquet of bright yellow stamens. After flowering, plants produce a woody, globose or oblate loculicidal capsule that splits to release the seeds.
Although the genus is botanically diverse, a handful of species account for almost all of its economic and ornamental importance. Camellia sinensis is the source of tea, one of the world's most widely consumed beverages, while C. oleifera is pressed for tea seed oil used in cooking and cosmetics. As garden plants, C. japonica, C. sasanqua, and C. reticulata dominate, and breeders have produced roughly 3,000 named cultivars and hybrids in cultivation worldwide. Camellias have a long horticultural history — grown in China for centuries before the first living plants reached England in 1739 — and remain among the most popular flowering evergreen shrubs for temperate gardens with acid soil.
Etymology
The genus name Camellia was given by Carl Linnaeus in 1753 in honor of Georg Joseph Kamel, a Jesuit missionary and botanist who worked in the Philippines and contributed early descriptions of Asian plants to European science. Linnaeus's Latinized rendering of Kamel's surname became the formal genus name when Camellia was published in the second volume of Species Plantarum.
Distribution
Camellia is native to tropical and subtropical regions of eastern and southern Asia, with a range stretching from the Himalayas eastward through southern China, Indochina, and Korea, to Japan and Indonesia. Centres of diversity lie in southern China and Indochina, where the bulk of described species occur. Camellias are not native to Europe or the Americas but have been very widely cultivated as ornamentals and as crop plants in warm-temperate climates.
Ecology
Camellias have relatively few serious pests but can suffer from camellia gall, petal blight, and nutrient deficiencies, particularly on unsuitable soils. Bud drop is a frequent problem and is usually traced to summer water stress while flower buds are forming.
Cultivation
Camellias are grown as evergreen ornamental shrubs in temperate and warm-temperate gardens, and the genus has produced one of the largest cultivar libraries of any flowering shrub — over 2,000 named clones of C. japonica alone, and roughly 3,000 cultivars and hybrids across the genus. Most camellias prefer partial or dappled shade, although C. sasanqua tolerates sunnier sites once established. They require acid, ericaceous soil with a pH below 7; gardeners often note that any site that grows rhododendrons well will grow camellias well. On alkaline soils, container culture in peat-free ericaceous compost is recommended.
Hardiness varies by species and cultivar. C. japonica and most spring-flowering hybrids are reliably hardy in mild temperate gardens (RHS H5), while autumn-flowering C. sasanqua is slightly more tender (H4) and may need winter shelter in colder regions. Soil must be kept moist through the summer, when next year's flower buds are forming; summer drought is the most common cause of bud drop. Rainwater is preferred over hard tap water, and mulching helps conserve soil moisture. Container plants benefit from an ericaceous feed in early spring, but feeding should stop by the end of July to avoid forcing late growth at the expense of buds.
Pruning is generally minimal — light shaping after flowering is sufficient — and hard renovation cuts in early spring will set flowering back by two or more years. Common cultivars cited in landscape use include 'Bob Hope', 'Yuletide', 'Pink-A-Boo', 'Water Lily', and 'Spring Festival'.
Conservation
The genus Camellia is not currently listed in the IUCN Global Invasive Species Database, which records no Camellia species in its archive. Individual species-level conservation assessments exist on the IUCN Red List but lie outside the scope of a genus-level summary.
Cultural Uses
The cultural footprint of Camellia is unusually broad for a single genus. C. sinensis is the botanical source of tea, while C. oleifera yields tea seed oil used in cooking and cosmetics, and C. japonica is the source of traditional Japanese tsubaki hair-care oil. Ornamentally, C. japonica, C. sasanqua, and C. reticulata together account for thousands of named cultivars grown around the world. Beyond the garden, the camellia is the state flower of Alabama, the white camellia was adopted as a symbol of the New Zealand women's suffrage movement and remains an emblem of Chanel haute couture, and the flower became a quiet symbol of the abolitionist movement in Imperial-era Brazil.
History
Camellias have a long horticultural lineage. Camellia sinensis was cultivated for tea in China for many centuries before the genus reached Europe, and ornamental species followed: the first living camellias in England were grown in 1739 by Robert Petre at Thorndon Hall in Essex. By the 1840s the camellia had become a luxury flower of European high society, an association immortalized by Alexandre Dumas's novel La Dame aux camélias. Today the genus underpins around 3,000 named ornamental cultivars and hybrids in addition to the enormous global tea industry.
Taxonomy Notes
Camellia L. is an accepted genus in the family Theaceae (order Ericales), established by Linnaeus in Species Plantarum 2: 698 (1753). GBIF lists 590 descendant taxa under the genus across species and infraspecific ranks, reflecting both the genus's natural diversity and the heavy load of named cultivars in cultivation. Oregon State University's landscape plants reference notes that clone identification and name registration in the genus are "confused to the point of hopelessness" after centuries of amateur and professional breeding.
Propagation
Camellias are most commonly propagated vegetatively to preserve cultivar identity, since seed-grown plants do not come true to the parent. Semi-ripe cuttings taken in mid to late summer, with a slight wound to the bark to encourage rooting, are the standard method. Hardwood cuttings taken from autumn to late winter also work and typically root within about three months. Layering and grafting are additional viable approaches, the latter often used for difficult cultivars or to combine vigorous rootstocks with desirable scion varieties.
