lettuce

Names and Synonyms

Common Names

• cultivated lettuce
• garden lettuce
• Romaine Lettuce

Scientific Names

Accepted name

Synonyms

• Lactuca scariola var. sativa
• Lactuca romana
• Lactuca sativa subsp. romana
• Lactuca sativa subsp. crispa
• Lactuca sativa var. planifolia
• Lactuca laciniata
• Lactuca sativa var. acephala
• Lactuca sativa var. spinosa
• Lactuca sativa var. longifolia
• Lactuca sativa subsp. minii
• Lactuca sativa var. romana
• Lactuca capitata
• Lactuca esculenta
• Lactuca sativa var. crispa
• Lactuca crispa
• Lactuca sativa convar. asparagina
• Lactuca palmata
• Lactuca sativa var. capitata
• Lactuca capitata
• Lactuca sativa var. yemensis
• Lactuca sativa subsp. capitata
• Lactuca sativa var. angustana

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and the phylum Streptophyta, specifically within the class Equisetopsida and subclass Magnoliidae. It is further classified under the order Asterales and the family Asteraceae. Finally, it is identified by the genus Lactuca, which contains the species Lactuca sativa.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a diverse range of presence across several regions in the European continent. In Northern Europe, its distribution can be observed in Finland, Sweden, and Great Britain. Moving towards the center of the continent, the species is also found throughout Middle Europe. Specifically, it is documented within the borders of Austria. Furthermore, its geographical reach extends to the territories of Czechia and Slovakia.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Lactuca sativa is characterized by a broad adaptability to various topographical settings, spanning an elevational range that begins at sea level (0 m AMSL) and extends to a maximum altitude of 2890 m AMSL, with a mean elevational range of approximately 1350 m AMSL. This species frequently establishes itself in disturbed environments, specifically finding suitable niches in habitats such as roadsides.

Elevational range max:

2890 m AMSL

Elevational range mean:

1350 m AMSL

Elevational range min:

0 m AMSL

Habitat :

roadsides

Life history

The life history of Lactuca sativa is characterized by an annual lifecycle, meaning the plant completes its entire biological development—from germination and vegetative growth to flowering and seed production—within a single growing season. Morphologically, it is classified as a therophyte, a life form that survives unfavorable environmental conditions by completing its life cycle quickly and persisting primarily through resistant seeds that remain dormant in the soil until favorable conditions return.

Life form :

therophyte

Lifecycle :

annual

Morphology

The morphology of Lactuca sativa is characterized by its growth form as a non-woody herb and a forb, maintaining a self-supporting structure without the need for climbing mechanisms. As a terrestrial species, it does not exhibit aquatic, semiaquatic, or epiphytic tendencies, growing independently rather than as a parasite. The plant features an erect shoot orientation, with a height that typically ranges from a minimum of 0.25 m to a maximum of 1 m, resulting in a mean plant height of approximately 0.54 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

herb

Growth form :

forb

Parasite :

independent

Plant height max:

1 m

Plant height mean:

0.541666666666667 m

Plant height min:

0.25 m

Shoot orientation :

erect

Woodiness :

non-woody

Physiology

The physiology of Lactuca sativa is characterized by a C3 photosynthetic pathway, which dictates its carbon fixation processes and environmental adaptations. The plant exhibits a non-succulent morphology and is strictly non-carnivorous, relying on traditional nutrient uptake through its root system. Its vegetative architecture is defined by a rosette leaf arrangement, where the leaves emerge in a circular pattern from a central growing point. The leaves themselves are ovate in form, with dimensions that vary significantly depending on growth stage and environmental conditions; typical leaf lengths range from a minimum of 6 cm to a mean of 10.5 cm, reaching a maximum of 15 cm. Similarly, leaf width fluctuates from a minimum of 1.5 cm to a mean of 4 cm, with a maximum width of 6.5 cm. These structural characteristics are closely linked to the plant's resource acquisition efficiency, as evidenced by a mean Specific Leaf Area (SLA) of 205.2 cm²/g, reflecting its leaf thickness and its strategy for light interception and gas exchange.

Carnivory :

non-carnivorous

Leaf arrangement :

rosette

Leaf form :

ovate

Leaf length max:

15 cm

Leaf length mean:

10.5 cm

Leaf length min:

6 cm

Leaf width max:

6.5 cm

Leaf width mean:

4 cm

Leaf width min:

1.5 cm

Photosynthetic pathway :

C3

Specific Leaf Area (SLA) mean:

205.2 cm²/g

Succulence :

no

Reproduction

The reproduction of Lactuca sativa is characterized by a sexual process, as asexual reproduction is notably absent, and the plant follows a monocarpic life cycle. The flowering phase typically occurs during the summer months, specifically starting in July and concluding in August. During this period, the plant produces violet-colored flowers arranged in a panicle inflorescence, with individual flowers measuring between 1.5 cm and 2 cm in length. The pollination process is biotic, relying on insects to facilitate fertilization, though self-fertilization is also present. Following successful pollination, the plant develops dry, indehiscent fruits known as achenes. These fruits are quite small, with a mean length of 0.35 cm (ranging from 0.3 to 0.4 cm) and a mean width of 0.13 cm (ranging from 0.08 to 0.13 cm). The resulting seeds are minute, possessing a mean mass of approximately 0.0010841665 g (ranging from 0.0006 to 0.00115 g) and a consistent seed volume of 0.9 mm³. For dispersal, the plant utilizes an anemochorous syndrome, meaning the seeds are primarily spread by the wind.

Dehiscence :

indehiscent

Dispersal syndrome :

anemochorous

Flower colour :

violet

Flower length max:

2 cm

Flower length min:

1.5 cm

Flowering time :

Jul

Flowering time :

Aug

Fruit dryness :

dry

Fruit length max:

0.4 cm

Fruit length mean:

0.35 cm

Fruit length min:

0.3 cm

Fruit type :

achene

Fruit width max:

0.13 cm

Fruit width min:

0.08 cm

Inflorescence :

panicle

Monocarpy :

monocarp

Pollination syndrome :

insect

Pollination syndrome :

biotic

Reproduction asexual :

absent

Seed mass max:

0.00115 g

Seed mass mean:

0.0010841665 g

Seed mass min:

6e-04 g

Seed volume max:

0.9 mm³

Self fertilization :

present

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Lactuca sativa has 149 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include Phytosterols, linoleic acid, 4-Terpineol, ALUMINUM, ANTHRACENE.

Phytosterols

1. Dr. Duke
2. Scientific reports

linoleic acid

1. Dr. Duke
2. The Biochemical journal

4-Terpineol

1. Asian Pacific journal of tropical biomedicine

ALUMINUM

1. Dr. Duke

ANTHRACENE

1. Talanta

ARSENIC

1. Dr. Duke

AU

1. BMC plant biology

Ag

1. BMC plant biology

Ash

1. Dr. Duke

BARIUM

1. Dr. Duke

Activities

Lactuca sativa has 625 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include Antioxidant, Analgesic, Antidepressant, Anticancer, Anticoagulant.

Antioxidant

1. Dr. Duke
2. 3 Biotech
3. Asian Pacific journal of tropical biomedicine
4. Applied biochemistry and biotechnology

Analgesic

1. Dr. Duke
2. 3 Biotech
3. Applied biochemistry and biotechnology

Antidepressant

1. Dr. Duke
2. 3 Biotech
3. Applied biochemistry and biotechnology

Anticancer

1. Dr. Duke
2. BMC complementary medicine and therapies

Anticoagulant

1. Dr. Duke
2. Applied biochemistry and biotechnology

Antidiabetic

1. Dr. Duke
2. BMC complementary medicine and therapies

11B-HSD-Inhibitor

1. Dr. Duke

5-Alpha-Reductase-Inhibitor

1. Dr. Duke

5-Lipoxygenase-Inhibitor

1. Dr. Duke

ACE-Inhibitor

1. Dr. Duke

Conditions

Lactuca sativa has 17 reported investigations on conditions identified across 0 scientific publications and several other databases. The most consistently reported conditions include antioxidant, insomnia, Alzheimer's disease, Analgesic, Anticoagulant.

Antioxidant

1. 3 Biotech
2. Applied biochemistry and biotechnology

Insomnia

1. Current neuropharmacology
2. Phytotherapy research : PTR

Alzheimer's disease

1. BMC complementary medicine and therapies

Analgesic

1. Applied biochemistry and biotechnology

Anticoagulant

1. Applied biochemistry and biotechnology

Antidepressant

1. Applied biochemistry and biotechnology

Bacillus subtilis

1. Genetics and molecular research : GMR

Dna damage

1. Acta poloniae pharmaceutica

Pseudomonas aeruginosa

1. Genetics and molecular research : GMR

Analgesic

1. 3 Biotech

Preparations

Lactuca sativa has 3 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include Extracts, hydro-alcoholic extract (HAE), plant extracts.

Extracts

1. Genes & genetic systems

Hydro-alcoholic extract (hae)

1. Iranian journal of pharmaceutical research : IJPR

Plant extracts

1. Molecules (Basel, Switzerland)