![](../../pictures/archives/compress/2020/2666/jpeg/04t.jpg) Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/01t.jpg) Rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/06t.jpg) Rose vervain (Glandularia canadensis) in dew on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/02t.jpg) Flowers of rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2024/3482/jpeg/06t.jpg) Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 3, 2024
![](../../pictures/archives/compress/2024/3503/jpeg/32t.jpg) Blooming rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
![](../../pictures/archives/compress/2024/3503/jpeg/15t.jpg) Rose vervain (Glandularia canadensis) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
![](../../pictures/archives/compress/2019/2460/jpeg/07t.jpg) Rose vervain (Glandularia canadensis) at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
![](../../pictures/archives/compress/2019/2460/jpeg/10t.jpg) Flowers of rose vervain (Glandularia canadensis) at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
![](../../pictures/archives/compress/2023/3352/jpeg/06t.jpg) Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, February 28, 2023
![](../../pictures/archives/compress/2022/3127/jpeg/22t.jpg) Rose vervain (Glandularia canadensis) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
![](../../pictures/archives/compress/2019/2448/jpeg/13t.jpg) Flower of rose vervain (Glandularia canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, February 16, 2019
![](../../pictures/archives/compress/2019/2457/jpeg/06t.jpg) Rose vervain (Glandularia canadensis) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
![](../../pictures/archives/compress/2019/2456/jpeg/02t.jpg) Rose vervain (Glandularia canadensis) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
![](../../pictures/archives/compress/2021/2894/jpeg/05t.jpg) Rose vervain (Glandularia canadensis) on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, March 28, 2021
![](../../pictures/archives/compress/2024/3633/jpeg/25t.jpg) 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
![](../../pictures/archives/compress/2022/3130/jpeg/23t.jpg) Rose vervain (Glandularia canadensis) on North Wilderness Trail in Sam Houston National Forest near Montgomery. Texas, April 14, 2022
![](../../pictures/archives/compress/2022/3130/jpeg/24t.jpg) Flowers of rose vervain (Glandularia canadensis) on North Wilderness Trail in Sam Houston National Forest near Montgomery. Texas, April 14, 2022
![](../../pictures/archives/compress/2024/3482/jpeg/23t.jpg) 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
![](../../pictures/archives/compress/2022/3113/jpeg/19t.jpg) 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
![](../../pictures/archives/compress/2022/3113/jpeg/18t.jpg) 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
![](../../pictures/archives/compress/2023/3362/jpeg/26t.jpg) 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
![](../../pictures/archives/compress/2023/3362/jpeg/28t.jpg) 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
![](../../pictures/archives/compress/2009/714/jpeg/06t.jpg) Rose vervain (Verbena canadensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richardson, Texas, February 22, 2009
![](../../pictures/archives/compress/2009/714/jpeg/07t.jpg) 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
![](../../pictures/archives/compress/2020/2667/jpeg/21t.jpg) Rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2744/jpeg/11t.jpg) 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
![](../../pictures/archives/compress/2020/2666/jpeg/01t.jpg) Flower of rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/02t.jpg) Blooming rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/02t.jpg) Yellow flower of rock-rose (frostweed, sunrose, Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2695/jpeg/02t.jpg) Macartney rose (Rosa bracteata) on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
![](../../pictures/archives/compress/2020/2695/jpeg/03t.jpg) Blooming Macartney rose (Rosa bracteata) on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
![](../../pictures/archives/compress/2022/3184/jpeg/18t.jpg) Canada wild rye (Elymus canadensis)(?) on Forest Service Road 203 near Richards Loop Trail in Sam Houston National Forest. Texas, June 29, 2022
![](../../pictures/archives/compress/2023/3367/jpeg/05t.jpg) Rock-rose on Forest Service Road 203 on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2020/2695/jpeg/04t.jpg) Macartney rose (Rosa bracteata) with flower beetles on Richards Loop Trail in Sam Houston National Forest. Texas, April 28, 2020
![](../../pictures/archives/compress/2022/3184/jpeg/20t.jpg) 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
![](../../pictures/archives/compress/2023/3366/jpeg/01t.jpg) Rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2019/2529/jpeg/18t.jpg) Canada wildrye (Elymus canadensis)(?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, June 15, 2019
![](../../pictures/archives/compress/2024/3510/jpeg/30t.jpg) Slender vervain (Verbena rigida) on road FS203 near Richards Loop Trail in Sam Houston National Forest. Texas, April 13, 2024
![](../../pictures/archives/compress/2023/3366/jpeg/02t.jpg) Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2024/3503/jpeg/10t.jpg) Rock-rose (Helianthemum carolinianum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
![](../../pictures/archives/compress/2023/3367/jpeg/07t.jpg) Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2022/3189/jpeg/01t.jpg) 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
![](../../pictures/archives/compress/2023/3366/jpeg/03t.jpg) Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2023/3367/jpeg/06t.jpg) Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
![](../../pictures/archives/compress/2024/3503/jpeg/09t.jpg) 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
![](../../pictures/archives/compress/2020/2666/jpeg/05t.jpg) Red shoot of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/11t.jpg) Young red leaves of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/26t.jpg) Shoot of sumac on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/08t.jpg) Blooming hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/15t.jpg) Orange shoot of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/14t.jpg) Young oak leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/23t.jpg) Blooming blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/19t.jpg) Shoot of sweetgum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/13t.jpg) Flower of blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/22t.jpg) Rush (Juncus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2022/3189/jpeg/03t.jpg) 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
![](../../pictures/archives/compress/2020/2666/jpeg/13t.jpg) Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/03t.jpg) White flowers of blackberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/23t.jpg) Flowers of rush (Juncus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/05t.jpg) Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/20t.jpg) Venation of a sassafras leaf on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/06t.jpg) Young leaves of sassafras on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/09t.jpg) Some young glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/10t.jpg) Shoot with glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/11t.jpg) Young leaves of sweetgum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/25t.jpg) Shoot of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2677/jpeg/25t.jpg) Vervain (Verbena) in Antique Rose Emporium. Independence, Texas, March 31, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/03t.jpg) Shoot of blackjack oak on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/24t.jpg) Lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/19t.jpg) Fresh leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/16t.jpg) Lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/17t.jpg) Celestial lily (Nemastylis geminiflora) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/25t.jpg) Racemed milkwort (Polygala polygama) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/10t.jpg) Young leaves of elm on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/03t.jpg) Young leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/24t.jpg) Blue eyed grass (Sisyrinchium) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/15t.jpg) Nodding beardtongue (Penstemon laxiflorus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/07t.jpg) Shoot of paper mulberry (Broussonetia papyrifera) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/04t.jpg) Fresh leaves of blackjack oak on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/10t.jpg) Red shoot of mustang grape (Vitis mustangensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/12t.jpg) Young leaves of blackjack oak (Quercus marilandica) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/18t.jpg) Flowers of lyreleaf sage (Salvia lyrata) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/25t.jpg) Shoot of Chinese tallow (Sapium sebiferum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/31t.jpg) Peeling puffball mushrooms (Lycoperdon marginatum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/06t.jpg) Cap of scaly sawgill mushroom (Neolentinus lepideus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/27t.jpg) Flowers of blue eyed grass (Sisyrinchium) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/26t.jpg) Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/12t.jpg) Some brown cup Ascomycete fungus on a site of old bonfire on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/20t.jpg) Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/01t.jpg) Blackseed speargrass (oats needle grass, Piptochaetium avenaceum) in a pine forest on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2022/3189/jpeg/02t.jpg) 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
![](../../pictures/archives/compress/2020/2667/jpeg/22t.jpg) Flowers of yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/21t.jpg) Raspberry slime mold (Tubifera ferruginosa) on a stump on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/05t.jpg) Fragrant sumac (Rhus aromatica) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2667/jpeg/26t.jpg) Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
![](../../pictures/archives/compress/2020/2674/jpeg/13t.jpg) Wolf s milk slime mold (Lycogala epidendrum) on a log on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
![](../../pictures/archives/compress/2020/2658/jpeg/09t.jpg) Missouri violet (Viola missouriensis) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
![](../../pictures/archives/compress/2020/2666/jpeg/09t.jpg) Young leaves of mustang grape (Vitis mustangensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
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