The citron is a large fragrant citrus fruit with a thick, coarse rind. It resembles a lemon, but is larger. It is one of the original citrus fruits from which all other citrus types developed through
Chinesische Zedrat Zitrone
Ancient mosaic of Tiberian Synagogue depicting citrons
Fingered citron with the leaves and thorns that are common to all varieties of citron. Chromolithograph by P. Depannemaeker, c. 1885, after B. Hoola van Nooten.
Citron (Citrus medica L.); flowering and fruiting stem. Coloured aquatint by G. Geri, c. 1825, after D. Serantoni.
The taxonomy of the species, varieties, cultivars, and graft hybrids within the genus Citrus and related genera is complex and controversial. Cultivated citrus are derived from various citrus species
Citron
…The citron (Citrus medica) is a large fragrant citrus fruit with a thick, coarse rind. It resembles a lemon, but is larger. It is one of the original citrus fruits from which all other citrus types developed through natural hybrid speciation or artificial hybridization. Though citron cultivars take on a wide variety…
Various citrus types in cross section. Some of them are hybrids between two or more original species.
Mandarin orange is a true species (Citrus reticulata); it is one of the progenitors of most cultivated citrus
The pomelo (Citrus maxima)
These varieties of citron (Citrus medica), Greek and fingered, have distinctly different appearances