Fall colors of cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, November 1, 2012
"Porcupine egg" of cocklebur (Xanthium strumarium) near Onion Creek in McKinney Falls State Park. Austin, Texas, October 26, 2008
Ripening burs of Rough Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, October 11, 2012
Bur of cocklebur (Xanthium strumarium) on north shore of Lake Somerville. Texas, September 27, 2008
Staminate flowers of cocklebur (Xanthium strumarium) on a shore of Lake Somerville in Birch Creek Unit of Somerville Lake State Park. Texas, September 8, 2012
Mature bur of Rough Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, October 11, 2012
Bur of rough Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, October 9, 2012
Burs of Rough Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 24, 2012
Green bur of Rough Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 24, 2012
Green flowers of cocklebur (Xanthium strumarium) on a shore of Lake Somerville in Birch Creek Unit of Somerville Lake State Park. Texas, September 8, 2012
Close up of staminate flowers of cocklebur (Xanthium strumarium) on a shore of Lake Somerville in Birch Creek Unit of Somerville Lake State Park. Texas, September 8, 2012
Staminate flowers of cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 16, 2012
Back lit leaves of rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, October 6, 2019
Rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, October 6, 2019
"Porcupine eggs" of cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020
Shoot of cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020
Flowers of rough cocklebur (Xanthium strumarium) on a shore of Somerville Lake near Birch Creek Unit of Somerville Lake State Park. Texas, August 29, 2020
Blooming rough cocklebur (Xanthium strumarium) on a shore of Somerville Lake near Birch Creek Unit of Somerville Lake State Park. Texas, August 29, 2020
Cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, October 16, 2020
Cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, November 6, 2020
Seed capsules of cocklebur (Xanthium strumarium) taken from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 4, 2020
Close-up of seed capsules of cocklebur (Xanthium strumarium) taken from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 4, 2020
Rough Cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 3, 2021
Flowers of rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 29, 2021
Rough Cocklebur (Xanthium strumarium) on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, September 12, 2021
Grasshopper on rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, September 19, 2021
Rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, October 31, 2021
Dry seeds of rough cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, October 31, 2021
Dry burs of cocklebur (Xanthium strumarium) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, December 20, 2021
Seeds of cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, June 22, 2022
Blooming cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 29, 2022
Green burs of cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 29, 2022
Dry last year cocklebur (Xanthium strumarium) on a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 5, 2023
Teliospores (in KOH, low magnification) of cocklebur rust fungus (Puccinia xanthii) from underside of leaves of cocklebur (Xanthium strumarium) collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Teliospores (in KOH) of cocklebur rust fungus (Puccinia xanthii) from underside of leaves of cocklebur (Xanthium strumarium), collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Large teliospores (in KOH) of cocklebur rust fungus (Puccinia xanthii) from underside of leaves of cocklebur (Xanthium strumarium), collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Details of teliospores (in KOH) of cocklebur rust fungus (Puccinia xanthii) from underside of leaves of cocklebur (Xanthium strumarium), collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Biseptate teliospores (in KOH) of cocklebur rust fungus (Puccinia xanthii) from underside of leaves of cocklebur (Xanthium strumarium), collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Underside of leaves of cocklebur (Xanthium strumarium) damaged by cocklebur rust fungus (Puccinia xanthii), collected over sewage line in Lick Creek Park a day before. College Station, Texas, August 13, 2023
Cocklebur (Xanthium strumarium) with cocklebur rust fungus (Puccinia xanthii), over sewage line in Lick Creek Park. College Station, Texas, August 15, 2023
Leaves of cocklebur (Xanthium strumarium) with cocklebur rust fungus (Puccinia xanthii), over sewage line in Lick Creek Park. College Station, Texas, August 15, 2023
Shoot of cocklebur (Xanthium strumarium) with cocklebur rust fungus (Puccinia xanthii), over sewage line in Lick Creek Park. College Station, Texas, August 15, 2023
Upper and lowers sides of leaves of cocklebur (Xanthium strumarium) with cocklebur rust fungus (Puccinia xanthii), over sewage line in Lick Creek Park. College Station, Texas, August 15, 2023
Cocklebur (Xanthium strumarium) in Lick Creek Park. College Station, Texas, September 13, 2023
Burs of cocklebur (Xanthium strumarium) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, September 14, 2024
Flowers of cocklebur (Xanthium strumarium) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, September 14, 2024
