Iva annua
(Annual Marsh Elder)
Iva annua, Pineywoods Boardwalk Trail, Lake Livingston State Park, Polk Co. 4131
Iva annua, Pineywoods Boardwalk Trail, Lake Livingston State Park, Polk Co. 4132
Iva annua, Pineywoods Boardwalk Trail, Lake Livingston State Park, Polk Co. 4123
Iva annua, Pineywoods Boardwalk Trail, Lake Livingston State Park, Polk Co. 4121
Iva annua, George Bush Park, Houston, Harris Co. 6630
Iva annua, George Bush Park, Houston, Harris Co. 6615
Iva annua, George Bush Park, Houston, Harris Co. 6652
Iva annua, Pineywoods Boardwalk Trail, Lake Livingston State Park, Polk Co. 4148
| Scientific Name | Iva annua | USDA PLANTS Symbol | IVAN2 |
| Common Name | Annual Marsh Elder, Sumpweed | ITIS Taxonomic Serial No. | 36031 |
| Family | Asteraceae (Sunflower) | SEINet Reference |
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| Description | Habitat: Moist or well drained, sandy, loamy, clay, limestone, or gravelly soils; in wooded areas. Plant: Rough, erect annual 20 to 48 inches tall (or taller), usually with several branches; sparsely to moderately hairy. Leaves: Opposite or a few near the top alternate; blades lanceolate to broadly ovate, 3/4 to 6 inches long, tapering to a pointed tip; margins are entire or toothed and hairy, the surfaces nearly smooth to having a few short hairs. Inflorescence: Spikelike racemes at the branch tips with many small, nodding flower heads that are initially green, becoming red or brown; most heads (9 to 17) are staminate (male) with 3 to 5 pistillate (female) heads above and below; each staminate head subtended with a green, linear pale (like a bract, also called "chaff"); each head is on a short peduncle and with a cup-shaped involucre. Bloom Period: September to November. References: Illinois Plants, Missouri Plants and "Manual of the Vascular Plants of Texas" by Correll and Johnston. |
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 2024