Sisymbrium irio [Brassicaceae]

Click on the images below to see larger versions.

Scientific Name Sisymbrium irio USDA PLANTS Symbol SIIR
Common Name London Rocket ITIS Taxonomic Serial No. 23314
Family Brassicaceae (Mustard) SEINet
Click Here
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:

© Tom Lebsack 2022