Sumpweed (Iva annua) and Morning glory (Ipomoea cordatotriloba) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 24, 2012
Spike of sumpweed (Iva annua) near utility lake in Lake Bryan Park. Bryan, Texas, September 30, 2013
Sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, September 16, 2012
Sumpweed (Iva annua) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 24, 2012
Pollinating bush of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, October 11, 2012
Dry sumpweed (Iva annua) in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
Sumpweed (Iva annua) near utility lake in Lake Bryan Park. Bryan, Texas, September 30, 2013
Pollinating flowers of sumpweed (Iva annua) near utility lake in Lake Bryan Park. Bryan, Texas, September 30, 2013
Close up of sumpweed (Iva annua) near utility lake in Lake Bryan Park. Bryan, Texas, September 30, 2013
Green flowers of sumpweed (Iva annua) near utility lake in Lake Bryan Park. Bryan, Texas, September 30, 2013
Sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, September 20, 2020
Shoot of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, July 18, 2020
Shoot of sumpweed (Iva annua) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020
Dodder (Cuscuta) on sumpweed (Iva annua) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020
Fresh leaves of sumpweed (Iva annua) on a recent sewage line right of way in Lick Creek Park. College Station, Texas, July 22, 2020
Sumpweed (Iva annua) on Raccoon Run Trail in Lick Creek Park. College Station, Texas, August 23, 2020
Sumpweed (Iva annua) on Raccoon Run Trail in Lick Creek Park. College Station, Texas, August 28, 2020
Sumpweed (Iva annua) on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, October 31, 2020
Sumpweed (Iva annua) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, November 6, 2020
Shoot of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, August 4, 2021
Leaves of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, August 4, 2021
Shoot of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, August 12, 2021
Dodder (Cuscuta) on sumpweed (Iva annua) on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, September 12, 2021
Sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, September 22, 2021
Dry plant of sumpweed (Iva annua) in Lick Creek Park. College Station, Texas, September 8, 2023
Sumpweed (Iva annua) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Wolf Pen Creek Park. College Station, Texas, September 4, 2024
Sumpweed (Iva annua) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
