 Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Rose vervain (Glandularia canadensis) in dew on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Flowers of rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 3, 2024
 Rose vervain (Glandularia canadensis) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Blooming rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Rose vervain (Glandularia canadensis) at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
 Flowers of rose vervain (Glandularia canadensis) at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
 Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
 Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, February 28, 2023
 Flower of rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, February 16, 2019
 Rose vervain (Glandularia canadensis) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Rose vervain (Glandularia canadensis) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Rose vervain (Glandularia canadensis) on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, March 28, 2021
 Rose vervain (Glandularia canadensis) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, October 20, 2024
 Rose vervain (Glandularia canadensis) on North Wilderness Trail in Sam Houston National Forest near Montgomery. Texas, April 14, 2022
 Flowers of rose vervain (Glandularia canadensis) on North Wilderness Trail in Sam Houston National Forest near Montgomery. Texas, April 14, 2022
 Blooming rose vervain (Glandularia canadensis) on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, March 5, 2024
 Rose vervain (Glandularia canadensis) on Forest Service Road 231 near North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, March 5, 2022
 Flowers of rose vervain (Glandularia canadensis) on Forest Service Road 231 near North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, March 5, 2022
 Rose vervain (Glandularia canadensis) near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, March 11, 2023
 Pink flowers of rose vervain (Glandularia canadensis) near Pole Creek on North Wilderness Trail of Little Lake Creek Wilderness in Sam Houston National Forest north from Montgomery. Texas, March 11, 2023
 Rose vervain (Verbena canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richardson, Texas, February 22, 2009
 Close up of a cluster of flowers of rose vervain (Verbena canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richardson, Texas, February 22, 2009
 Rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Bur-like seed capsules with hooks of Canadian black snakeroot (Sanicula canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, July 28, 2020
 Blooming rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Flower of rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Yellow flower of rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Macartney rose (Rosa bracteata) on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
 Blooming Macartney rose (Rosa bracteata) on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
 Canada wild rye (Elymus canadensis)(?) on Forest Service Road 203 near Richards Loop Trail in Sam Houston National Forest. Texas, June 29, 2022
 Rock-rose on Forest Service Road 203 on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Macartney rose (Rosa bracteata) with flower beetles on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
 Spikes of Canada wild rye (Elymus canadensis)(?) on Forest Service Road 203 near Richards Loop Trail in Sam Houston National Forest. Texas, June 29, 2022
 Rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Canada wildrye (Elymus canadensis)(?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, June 15, 2019
 Slender vervain (Verbena rigida) on road FS203 near Richards Loop Trail in Sam Houston National Forest. Texas, April 13, 2024
 Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Rock-rose (Helianthemum carolinianum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Artichoke-shaped gall on on the top of a shoot of goldenrod Solidago canadensis on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022
 Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Yellow flower of rock-rose (Helianthemum carolinianum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Red shoot of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young oak leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot of sweetgum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Blooming blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Rush (Juncus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Flower of blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Orange shoot of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Blooming hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot of sumac on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young red leaves of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Galls on leaves of goldenrod Solidago canadensis caused by gall midges Asteromyia carbonifera with symbiotic fungus Botryosphaeria dothidea on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022
 White flowers of blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Venation of a sassafras leaf on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Some young glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot with glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sassafras on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sweetgum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Flowers of rush (Juncus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Vervain (Verbena) in Antique Rose Emporium. Independence, Texas, March 31, 2020
 Shoot of blackjack oak on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Young leaves of elm on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Fresh leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Nodding beardtongue (Penstemon laxiflorus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Blue eyed grass (Sisyrinchium) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Racemed milkwort (Polygala polygama) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Celestial lily (Nemastylis geminiflora) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Cap of scaly sawgill mushroom (Neolentinus lepideus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot of Chinese tallow (Sapium sebiferum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Flowers of blue eyed grass (Sisyrinchium) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Some brown cup Ascomycete fungus on a site of old bonfire on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Peeling puffball mushrooms (Lycoperdon marginatum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Young leaves of blackjack oak (Quercus marilandica) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Red shoot of mustang grape (Vitis mustangensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Flowers of lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Fresh leaves of blackjack oak on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Shoot of paper mulberry (Broussonetia papyrifera) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Blackseed speargrass (oats needle grass, Piptochaetium avenaceum) in a pine forest on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Leaves of goldenrod Solidago canadensis with raised white cushions caused by gall midges Asteromyia carbonifera and symbiotic fungus Botryosphaeria dothidea inside the galls on Richards Loop Trail in Sam Houston National Forest. Texas, July 10, 2022
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Wolf s milk slime mold (Lycogala epidendrum) on a log on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Raspberry slime mold (Tubifera ferruginosa) on a stump on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Flowers of yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Pine needles with rust fungus Coleosporium asterum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of mustang grape (Vitis mustangensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
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