Lactuca, commonly known as lettuce, is a genus of flowering plants in the family Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia. Lactuca is derived from Latin and means “having milky sap”. Lactuca sibirica, the Siberian lettuce, occupies the northernmost distribution range of all Eurasian Lactuca species. It is a boreal element extending from Scandinavia in the west to Kamchatka, Korea and Japan in the east. It is the host of the systemic rust fungi Puccinia minussensis, which propagates with it along its ramets, resulting in complex host-parasite interactions.
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