Sisymbrium irio
(London Rocket)
Sisymbrium irio, Santa Elena Canyon, Big Bend NP 4618
Sisymbrium irio, Santa Elena Canyon, Big Bend NP 4632
Sisymbrium irio, Santa Elena Canyon, Big Bend NP 4625
Sisymbrium irio, Santa Elena Canyon, Big Bend NP 4639
Sisymbrium irio, Santa Elena Canyon, Big Bend NP 4620
| 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 Map Color Key |
Texas Status: Introduced |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024