Sisymbrium altissimum

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Taxonomy
Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Order: Capparales
Family: Brassicaceae
Genus: Sisymbrium
Species: altissimum
Scientific Name
Sisymbrium altissimum
L.
Scientific Name Synonym
Norta altissima
L.
Common Names

tumble mustard, tall tumblemustard, Jim Hill mustard, tall mustard, tumbleweed mustard

Overview

Appearance
Sisymbrium altissimum is an annual/biennial herb native to Eurasia. Plants can reach almost 5 ft. (1.5 m) in height.
Foliage
Cauline (stem) leaves are alternate, 0.5-5 in. (1.3-12.7 cm) long and decrease in size up the stem.
Flowers
Flowering occurs in late spring to summer, when small, 4-petaled, yellow to white flowers develop in groups at the apex of the stems.
Fruit
Fruits are narrow seed pods that are 2-4 in. (5-10 cm) long and contain more than 120 seeds.
Ecological Threat
Sisymbrium altissimum was first seen in the United States in 1878 in Philadelphia; seeds were probably introduced accidentally in ship ballast. Plants invade fields, open forests, and other disturbed open areas.

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