Bauhinia

Bauhinia is a large genus of flowering plants in the subfamily Cercidoideae and tribe Bauhinieae, in the large flowering plant family Fabaceae, with a pantropical distribution. The genus was named after the Bauhin brothers Gaspard and Johann, Swiss-French botanists.
Many species are widely planted in the tropics as orchid trees, particularly in India, Sri Lanka, Vietnam and southeastern China. Other common names include mountain ebony and kachnar (India and Pakistan). Before the family was reorganised, a number of genera including the lianas "Lasiobema" and "Phanera" were placed here (see related genera).
In the United States, the trees grow in Hawaii, coastal California, Texas, Louisiana, and Florida. "Bauhinia" × "blakeana" is the floral emblem of Hong Kong—a stylized orchid tree flower appears on the flag of Hong Kong and Hong Kong Airlines uses 'Bauhinia' as its radio callsign in air traffic communication.
Description.
"Bauhinia" trees typically reach a height of 6–12 m and their branches spread 3–6 m outwards. The lobed leaves usually are 10–15 cm across.
The five-petaled flowers are 7.5–12.5 cm diameter, generally in shades of red, pink, purple, orange, or yellow, and are often fragrant. The tree begins flowering in late winter and often continues to flower into early summer. Depending on the species, "Bauhinia" flowers are usually in magenta, mauve, pink or white hues with crimson highlights.
Cultivation.
Propagation of "Bauhinia" species is from seeds or cuttings. They thrive in alkaline soils and do not tolerate salty conditions. Full sun exposure is preferred but they can be grown under partial sun. Generous watering is needed during summer; moderate moisture required in winter.
Species.
Accepted species.
"Bauhinia" includes at least the following species:
Species names with uncertain taxonomic status.
The status of the following species is unresolved:
Hybrids.
One hybrid is known:
Fossils.
Several fossils of "Bauhinia" species have been discovered:
Segregated genera.
Species in the genera "Barklya", "Gigasiphon", "Lasiobema", "Lysiphyllum", "Phanera", "Piliostigma", "Schnella", and "Tylosema" are sometimes included in "Bauhinia" ("sensu lato").