Lactuca sativa

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Lactuca sativa L.

Asteraceae

Life form: annual or biennial

Exposure: sun - Exposure: half shade   2

Moisture: moderately moist

Arrangement: alternate
Leaves:

Shape: orbicular

Division: simple

Shape: many-stellate
Fruit: achene

3A / f8da21 

Inflorescence: corymb

Petals: not specified
Habit: not specified

Growth form: not specified

Taxonomy

Divisio:
Magnoliophyta
Subdivisio:
Magnoliophytina
Classis:
Rosopsida
Subclassis:
Asteridae
Superordo:
Asteranae
Ordo:
Asterales

Lactuca sativa, commonly known as lettuce, belongs to the group of annual and biennial plants.

Naming

Lactuca sativa was described by Carl Linnaeus in 1753. The name is considered as validly published.

Taxonomy

Lactuca sativa is a species in the genus Lactuca which contains approximately 120 to 290 species and belongs to the family of the Asteraceae (Aster Family).

Characteristics

Lactuca sativa - habitus
Lactuca sativa - flowers

Growth

The plants are comparatively fast-growing and reach heights of 30 to 70 centimetres. The plants reach a width of 30 to 60 centimetres.

Leaves

Lactuca sativa has mid-green, simple leaves that are alternate. The leaves are orbicular and entire. The surface of the leaves is glabrous.

Flowers and Fruits

Lactuca sativa produces corymbs of yellow many-stellate flowers from July to September.

The plants produce achenes.

Root System

The plants form tap roots.

Distribution

Cultivation

The plants prefer a sunny to half-shady situation on moderately moist soil. They tolerate temperatures down to -45°C (USDA zone 2).

Tolerance of special soil conditions

  • high: city climate

Uses

Maintenance and Propagation

The plants usually require only a moderate amount of maintenance.


Cultivars

Pests and Diseases

Literature

  • Walter Erhardt, Erich Götz, Nils Bödeker, Siegmund Seybold: Der große Zander. Eugen Ulmer KG, Stuttgart 2008, ISBN 978-3-8001-5406-7. (Ger.)
  • Christoper Brickell (Editor-in-chief): RHS A-Z Encyclopedia of Garden Plants. Third edition. Dorling Kindersley, London 2003, ISBN 0-7513-3738-2.

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