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Lesser jack

Scientific Name
Emex spinosa
Scientific Author
Campdera, F. (1819
Taxonomy
(Magnoliophyta: Magnoliopsida: Polygonales: Polygonaceae)
Reliability
High
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Diagnostic Images

Achene Lateral
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Caption
Seed Project
Source
Clare McLellan Museum Victoria
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Diagnostic Images (6)
Diagnostic Notes
Pictured: Achene

Disseminule: Fruit (referred to as achene or seed unit) pictured with persistent floral parts

Description:

Achene appendages: Cavities, Ridges and grooves, Spines

Achene Colour: Brown

Achene Length: 4 - 7mm

Achene Sculpture:

Achene Shape: Angulates, 3 - spined or triangular in cross section

Fruit an achene enclosed in persistent hardened perianth, 4–8 mm long, 2.4–5 mm wide and thick (not including spines). Three sided, each side with 6–10 depressions in upper portion, arranged in 2 columns, and 2 depressions in lower portion; all the lower depressions together form a tapered base. Toward the apex, each edge (of outer segments) forms a rigid recurved spine. Three inner segments form an erect, connivent apex taller than spines. Cross section triangular to nearly round. Surface dull, light to dark straw colored or reddish-brown; dusty appearance, rough. Scar variable. Embryo peripheral, J-shaped, cotyledons longer than radicle; endosperm readily visible. (Scher, J. L. and D. S. Walters. 2010. Federal noxious weed disseminules of the U.S. California Department of Food and Agriculture, and Center for Plant Health Science and Technology, USDA, APHIS, PPQ.) Source: See Web Links Federal Noxious Weed Disseminules of the U.S.
More Information
Author
Clare McLellan
Created
20/03/2012 10:23 AEST
Last Updated
21/01/2013 11:47 AEST
Citation
Clare McLellan (2012) Lesser jack (Emex spinosa) Updated on 1/21/2013 11:47:24 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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