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The Collaborative International Dictionary
Lactuca

Lactuca \Lac*tu"ca\, n. [L., lettuce. See Lettuce.] (Bot.) A genus of composite herbs, several of which are cultivated for salad; lettuce.

Wikipedia
Lactuca

Lactuca, commonly known as lettuce, is a genus of flowering plants in the daisy family, Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia.

Its best-known representative is the garden lettuce (Lactuca sativa), with its many varieties. "Wild lettuce" commonly refers to the wild-growing relatives of common garden lettuce. Many species are common weeds. Lactuca species are diverse and take a wide variety of forms. They are annuals, biennials, perennials, or shrubs. Their flower heads have yellow, blue, or white ray florets. Some species are bitter-tasting.

Most wild lettuces are xerophytes, adapted to dry habitat types. Some occur in more moist areas, such as the mountains of central Africa.

Usage examples of "lactuca".

Erysimum pumilum, Gynerium argenteum, Helianthus orygalis, Lactuca sonchifolia, Lilium auratum, Lobelia cardinalis, Onosma taurica, Origanum pulchellum, Phlox, Physalis Alkekengi, Polygonum Brunonis, P.

All lettuces possess some of this narcotie juice, Lactuca virosa having the most, and the others in the following order: L.

Lactuca Canadensis, the wild Lettuce or Trumpet Weed, and Hieracium Canadense, are also given the designation of 'Fireweed' in America from their habit of growing on newly-burnt fallow, but Erechtites hieracifolia (Rafin.