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A. thaliana is a small plant, 2 to 25 cm (1 to 9.5 in) in height, with a basal rosette of leaves that are 0.8 to 3.5 cm (0.3 to 1.3 in) long and up to 1 cm (0.4 in) wide; cauline leaves (on the flowering stem) are smaller. The small white flowers, which are less than 0.5 cm in diameter, have 4 petals and develops into a siliqua (a seed capsule or pod) that contains 20-30 small plump tan brown seeds, each 0.5 mm or less in diameter.
A. thaliana originated in Europe and central, southwest Asia, and northern Africa, but has been introduced and naturalized throughout the U.S. and Canada, and has been introduced in nearly worldwide. Like many species in the Brassicaceae, A. thaliana are edible by humans, and can be used similarly to other mustard greens, in salads or sautéed, but its use as an edible spring green is not widely noted. It is generally considered a weed, due to its widespread distribution in agricultural fields, roadside, and disturbed lands.
The large amount of research and genome information on A. thaliana is compiled in online sources including The Arabidopsis Information Resource (TAIR) (http://www.arabidopsis.org/), Arabidopsis Biological Resource Center, (ABRC) based at Ohio State University (http://abrc.osu.edu/), and Nottingham [European] Arabidopsis Stock Centre (http://arabidopsis.info/)).
(FNA 2012, NSF 2012, Wikipedia 2012.)