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Lettuce

Scientific Name
Lactuca sativa
Scientific Author
Linnaeus, C (1753)
Taxonomy
(Magnoliophyta: Magnoliopsida: Asterales: Asteraceae)
Reliability
High
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Diagnostic Images

Achene Dorsal
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Caption
Seed Project
Source
Clare McLellan Museum Victoria
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Diagnostic Images (8)
Other Images (1)
Diagnostic Notes
Pictured: Achene

Disseminule: Fruit (referred to as achene or seed unit)

Description

Achene appendages: Ridges and grooves

Achene Colour: Yellow

Achene Length: 2 - 4mm

Achene Sculpture: Striate

Achene Shape: Lanceolate (Lance shaped)

The production of empty seeds is common in non-domesticated species of the Asteraceae. Empty seeds may have a normal seed coat but an absent or under-developed embryo, or limited storage tissue.

The fruit (3-4 mm) is an indehiscent achene, with a single locule containing a single seed. The achenes are narrowly obovate and compressed, with 5-7 ribs on each face. The tip is formed into a narrow beak, topped by a pappus of 2 equal rows of soft white, simple hairs. The seeds are white, yellowish, grey or brown in colour.

Source: See Web Links KEW Royal Botanic Gardens

More Information
Author
Clare McLellan
Created
07/02/2012 03:08 AEST
Last Updated
17/01/2013 11:50 AEST
Citation
Clare McLellan (2012) Lettuce (Lactuca sativa ) Updated on 1/17/2013 11:50:02 AM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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