lactuca

Lactuca, commonly known as lettuce, is a genus of flowering plants in the Sunflower family Asteraceae. The genus includes about 100 species, distributed worldwide, but mainly in temperate Eurasia. Its best-known representative is the garden lettuce (Lactuca sativa), with its many varieties. But many are just common weeds. They are annuals or perennials. Their height can vary between 10-180 cm. They form heads or capitula in panicles of yellow, brown or purple flowers in ray florets.The non-edible species may contain bitter elements. Others contain a milky juice.
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Noun
1. an herb with milky juice: lettuce; prickly lettuce
(synonym) genus Lactuca
(hypernym) asterid dicot genus
(member-holonym) Compositae, family Compositae, Asteraceae, family Asteraceae, aster family
(member-meronym) lettuce

(n.)
A genus of composite herbs, several of which are cultivated foe salad; lettuce.
  

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lettuce