Guaiacum uses, including as lumber, for medicinal purposes, and as ornamentals. The trade of all species of "Guaiacum" is controlled under CITES Appendix II. "Guaiacum officinale" is the national flower of Jamaica, while "Guaiacum sanctum" is the national tree of the Bahamas. The genus is famous as the supplier of lignum vitae, which is the heartwood of several species in the genus. It is the fourth-hardest variety of wood as measured by the Janka hardness test, requiring a force of to embed a steel ball in diameter half that distance into the wood. The Spanish encountered guaiacum wood when they conquered
Janka, Contai Janka, Contai Janka is a village, in Khejuri II CD Block in Contai subdivision of Purba Medinipur district in the state of West Bengal, India. Khejuri police station is located at Janka. The headquarters of Khejuri II CD Block are located at Janka. As per 2011 Census of India Janka had a total population of 2,804 of which 1,452 (52%) were males and 1,352 (48%) were females. Population below 6 years was 347. The total number of literates in Janka was 2,214 (90.11% of the population over 6 years). Khejuri police station is located at Janka. It has jurisdiction over