The basic chromosome number of the genus is 13, and most species are diploid (2n=26). However, natural polyploidy exists, particularly in Jasminum sambac (2n=39), Jasminum flexile (2n=52), Jasminum primulinum (2n=39), and Jasminum angustifolium (2n=52).
Distribution and habitat
Jasmines are native to tropical and subtropical regions of Europe, Africa, Asia, and Australasia. Their center of diversity, however, is in South and Southeast Asia.
Some species have common names that do not match their region of origin. Jasminum sambac, for example, has the English common names of "Arabian jasmine" or "Tuscan jasmine". However, it is not native to the Arabian peninsula or Western India as is commonly perceived. It is native to Southeast Asia. The Spanish jasmine or Catalonian jasmine (Jasminum grandiflorum), is another example. It is not native to the Iberian peninsula but was originally from Iran (Persia) and western South Asia. Jasmine should not be confused with the day-blooming, yellow-flowered vine, Jessamine/Carolina Jasmine::Gelsemium sempervirens, which can cause death if eaten.
Jasminum fluminense (which is sometimes known by the