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Sisymbrium irio [Brassicaceae]

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Scientific Name Sisymbrium irio USDA PLANTS Symbol SIIR
Common Name London Rocket ITIS Taxonomic Serial No. 23314
Family Brassicaceae (Mustard) SEINet
Reference
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Description Habitat: Roadsides, fields, waste grounds, prairies, disturbed sites and desert areas.
Plant: Erect annual up to 24 inches tall; stems branching from base and above; herbage smooth to sparsely pubescent.
Leaves: Basal and stem leaves petiolate; basal leaves not in a rosette; stem leaves alternate, blades oblanceolate or oblong in outline, 1 to 4-3/4 inches long, pinnately-divided into 2-6 pairs of lobes; margins entire, dentate, or lobed; uppermost stem leaves sometimes not lobed.
Inflorescence: Small yellow flowers in terminal racemes on slender ascending pedicels; 4 green sepals; 4 yellow petals ~1/8-inch long.
Bloom Period: December to May.
Fruit: Long, very narrow, straight slender capsules, 3/4 to 2 inches long.
References: "Manual of the Vascular Plants of Texas" by Correll and Johnston and SEINet.
BONAP Distribution Map

Texas Status:
Introduced

© Tom Lebsack 2022