Texas Wildbuds
Chromolaena odorata
(Siamweed)
Chromolaena odorata, Bensten-Rio Grande State Park, Hidalgo Co. 2914
Chromolaena odorata, Bensten-Rio Grande State Park, Hidalgo Co. 2909
Chromolaena odorata, Bensten-Rio Grande State Park, Hidalgo Co. 2921
| Scientific Name | Chromolaena odorata (Eupatorium odoratum) | USDA PLANTS Symbol | CHOD |
| Common Name | Siamweed, Crucita, Jack-in-the-bush | ITIS Taxonomic Serial No. | 37034 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description | Habitat: Dry soils of various types in thickets, pine forests, canal banks, roadsides and disturbed sites. Plant: Erect to sprawling perennial sub-shrub; single, much-branched stem up 3 to 6+ feet tall; stems branches are opposite, often upward-curving. Leaves: Opposite, narrowly lanceolate to deltate-lanceolate or ovate-lanceolate, 1.2 to 4 inches long and 0.4 to 1.2 inches wide; margins are nearly entire to slightly dentate; tips are long-acuminate; upper surface slightly hair, lower rather velvety; on petioles 1/8 to 1/2-inch long. Inflorescence: Clusters of 5 to 50+ flower heads in corymbs at stem tips; each blossom less than 1/2-inch wide with 20 to 35 lilac to light purplish-blue disk flowers with similarly colored, long, thread-like stigmas; no ray flowers; cylindrical involucre with 4 to 6 layers of graduated, green phyllaries. Bloom Period: October to December. References: "Manual of the Vascular Plants of Texas" by Correll and Johnston, "Wildflowers of Texas" by Michael Eason and Flora of North America. |
BONAP Distribution Map Map Color Key |
Texas Status: Native |
Banner photo of Castilleja indivisa and Lupinus ssp. taken along FM 1323 north of Johnson City, Blanco County
© Tom Lebsack 2025
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