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3837-24. Button snakeroot (Eryngium yuccifolium) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026Similar picturesLarge thumbnails | Use small thumbnails | View as slideshow |
 Spiny heads of button snakeroot (Eryngium yuccifolium) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  White flowers of summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Flowers of spotted beebalm (Monarda punctata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight, collected on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  Flowers of pony beebalm (Monarda pectinata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight, collected on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  Spiderwort (Tradescantia) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 15, 2025  Blue flowers of Tradescantia both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 15, 2025  Leaf and flowers of spiderwort (Tradescantia) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 15, 2025  Yellow star-grass (Hypoxis hirsuta) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 15, 2025  Eastern swamp privet (Forestiera acuminata var. vestita) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 9, 2025  Whorled milkweed (Asclepias verticillata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  American Germander (Teucrium canadense) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Spotted beebalm (Monarda punctata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Hooker s eryngo (Eryngium hookeri) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Flower of summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Flowers of summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Pony beebalm (Monarda pectinata) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight, collected on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  Spotted beebalm (Monarda punctata) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight, collected on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  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  Spiny button-like flowerheads of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 13, 2022  Blooming stickleaf (blazing star) Mentzelia texana(?) 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  Flowers of stickleaf (blazing star) Mentzelia texana(?) 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  Hooker s eryngo (Eryngium hookeri) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 14, 2020  Spiny button-like flowerheads of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) near Deer Run Trail in Lick Creek Park. College Station, Texas, June 8, 2008  Spiny button-like flower heads in umbels of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek park, on Deer Run Trail. College Station, June 15, 2008  Flowers of woolly croton (hogwort, Croton capitatus) 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  Buffalo gourd both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Yellow star-grass (Hypoxis hirsuta) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 15, 2025  Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 4, 2010  Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 9, 2019  Spiny button-like flowerheads of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, May 22, 2012  Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) with a butterfly in dew in Lick Creek Park. College Station, Texas, June 1, 2010  Dissected buffalo gourd both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Spiny flowerhead of Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, June 15, 2008  Spiny flowerhead of Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 9, 2019  Hooker s eryngo (Eryngium hookeri) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 14, 2019  Spiny button-like flowerheads of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) near Deer Run Trail in Lick Creek Park. College Station, Texas, July 4, 2013  Flowers of smartweed (Persicaria, Polygonum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Dry flowers of Hooker s eryngo (Eryngium hookeri) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 9, 2020  Flower heads in umbels of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 9, 2019  Dodder (Cuscuta) on Hooker s eryngo (Eryngium hookeri) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020  Flower of buttonbush on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Formerly flooded area overgrown by Hooker s eryngo (Eryngium hookeri) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 19, 2020  Old live oaks on Bee Hill Trail on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Young toad on a sandy path on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  American Germander (Teucrium canadense) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Stickleaf (blazing star) Mentzelia texana(?) with a crab spider both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Slender orange-bush lichen (Teloschistes exilis) both in natural light and under 365 nm ultraviolet (UV-A) blacklight on a twig from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Blooming summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Button lichen (Buellia) on a rock in a forest in area of sandstone outcrops at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 26, 2020  White flowers of summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, June 28, 2026  Button lichen (Buellia) growing on a rock in a forest in area of sandstone outcrops at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 26, 2020  Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, July 1, 2014  Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, July 10, 2014  Skullcap (Scutellaria parvula) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Close up of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, July 1, 2014  Flowers of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, July 10, 2014  Branching sprays of white flowers of wild buckwheat (Yerba colorado, Eriogonum annuum(?)) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024  Dry seed heads of Button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, October 11, 2012  Flower heads of button snakeroot (yuccaleaf snakeroot, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, July 1, 2014  Slender vervain (verbena) 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, May 16, 2026  A box turtle on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Head of a box turtle on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Buttonbush on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Light blue flower of spiderwort (Tradescantia) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 20, 2022  Plantain (Plantago) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Seedling of bluebonnet (Lupinus) in dew on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Shoot of sage (Salvia) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Florets of buttonbush (Cephalanthus occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Blooming buttonbush (Cephalanthus occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Shoot of coralberry (Symphoricarpos orbiculatus) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Indian paintbrush (Castilleja indivisa) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Blue flowers of Carolina larkspur (Delphinium carolinianum) under both white light and a 365 nm ultraviolet (UV-A) LED flashlight from Birch Creek Unit of Somerville Lake State Park. Texas, May 16, 2026  Underside of inkcap mushroom Coprinopsis insignis on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  Wild potato vine (Ipomoea pandurata) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Flowers of woolly-white (Hymenopappus artemisiaefolius) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Two-flower melic grass (Melica mutica) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Showy blue star (Amsonia illustris) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Reddish fruits of buttonbush (Cephalanthus occidentalis) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Leaves of woolly-white (Hymenopappus artemisiaefolius) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Blooming woolly-white (Hymenopappus artemisiaefolius) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 10, 2012  Button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 3, 2018  Barnyard grass (cockspur, Echinochloa crus-galli) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Basal leaves of woolly-white (Hymenopappus artemisiaefolius) in dew on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Inkcap mushroom Coprinopsis insignis at the base of a living elm on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 19, 2026  Flower buds of squaw-weed (Senecio ampullaceus) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  White flowers of wild potato vine (Ipomoea pandurata) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 12, 2026  Shoot of western soapberry tree (Sapindus saponaria var. drummondii) on Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, March 21, 2026  Blooming button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 10, 2012  Flowers of button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 3, 2018  Umbels of button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 20, 2012  Flowers of button snakeroot (rattlesnake master, Eryngium yuccifolium) in Lick Creek Park. College Station, Texas, June 10, 2012  Ramalina lichen on a twig when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, September 1, 2024  Buttonbush (Cephalanthus occidentalis) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024  Sandburs (Cenchrus spinifex) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024  Flowers of Passiflora foetida when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024  Fruticose lichens on an elm twig when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, September 1, 2024  Snake cotton (Froelichia) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from a trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 28, 2024 |