Streptanthus petiolaris
(Brazos Rockcress)
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7908
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7940
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7956
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7945
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7952
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7937
Streptanthus petiolaris, Lake Whitney State Park, Hill Co. 7923
| Scientific Name | Streptanthus petiolaris (Arabis petiolaris) | USDA PLANTS Symbol | ARPE4 |
| Common Name | Brazos Rockcress, Brazos Jewelflower | ITIS Taxonomic Serial No. | 522093 |
| Family | Brassicaceae (Mustard) | SEINet Reference |
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| Description | Habitat: Open, rocky areas, thickets, roadsides, canyons, limestone prairies, juniper-oak woods. Plant: Upright annual 16 to 40 inches tall, single pubescent-hairy stem becoming branched and smooth above. Leaves: Basal leaves on petioles that are 0.5-inch to to 2.75 inches long; blades are oblanceolate in outline and lyrate-pinnatifid, 1.25 to 8.25 inches long and with short-hairy surfaces; lower stem leaves similar but upper ones becoming linear-lanceolate, 0.8 to 2.4 inches long with smooth surfaces and entire margins. Inflorescence: Clusters (in racemes) at the end of stems with numerous small flowers about 0.2-inch across; four petals are white to pale lavender and sepals are lavender-ish. Bloom Period: April and May. Fruit: Fruiting pedicels point upward, 0.25 to 0.5-inch long; fruit capsules are long, narrow, straight, flattened and 1.5 to 3.5 inches long and less than 0.2-inch wide. References: Vascular Plants of Williamson County by A.C. Gibson, Flora of North America, "Wildflowers of the Texas Hill Country" by Marshall Enquist, and "Manual of the Vascular Plants of Texas" by Correll and Johnston. |
BONAP Distribution Map Map Color Key |
Texas Status: Native Endemic |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2024