 Tributary of Lampasas River near the entrance of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 River bed of a tributary of Lampasas River near the entrance of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 Limestone cave with a spring of a tributary of Lampasas River near the entrance of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 Old suspension bridge over a tributary of Lampasas River at the head of Stillhouse Hollow Nature Trail in Chalk Ridge Falls Park. Belton - Killeen, Texas, August 17, 2008
 Waterfall of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, May 17, 2009
 Waterfall of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 Waterfall and a pond of Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 Steel cable suspension bridge downstream from the falls in Chalk Ridge Falls Park, below a dam of Stillhouse Hollow Lake. Belton - Killeen, Texas, August 17, 2008
 A spring with maiden ferns of a small creek in Chalk Ridge Falls Park. Belton - Killeen, Texas, May 17, 2009
 Flowerhead of sneezeweed (bitterweed, Helenium amarum) with down-flexed petals in dew in Lick Creek Park, with yellow ray flowers that bend downward. College Station, Texas, September 30, 2008
 Yellow flowers of sneezeweed (Helenium amarum) in Wolf Pen Creek Park. College Station, Texas, May 1, 2019
 Flowers of sneezeweed (Helenium amarum) in Lick Creek Park. College Station, Texas, July 22, 2014
 Potted sneezeweed (Helenium) in Antique Rose Emporium. Independence. Texas, March 15, 2009
 Sneezeweed (bitterweed, Helenium amarum) with yellow ray flowers in dew that bend downward in Lick Creek Park. College Station, Texas, September 30, 2008
 Sneezeweed (Helenium amarum) in Lick Creek Park. College Station, Texas, May 22, 2012
 Sneezeweed (Helenium amarum) in Wolf Pen Creek Park. College Station, Texas, May 1, 2019
 Sneezeweed (Helenium amarum) in Lick Creek Park. College Station, Texas, October 10, 2022
 Sneezeweed (Helenium amarum) in Lick Creek Park. College Station, Texas, July 22, 2014
 Sneezeweed (Helenium amarum) in Lick Creek Park. College Station, Texas, July 15, 2014
 Fringed sneezeweed (Helenium drummondii) in Big Thicket park on Sundew Trail. Texas, April 26, 2008
 Sneezeweed (bitterweed, Helenium amarum) in Lick Creek Park. College Station, September 17, 2008
 Sneezeweed (bitterweed, Helenium amarum) in Lick Creek Park. College Station, Texas, September 12, 2008
 Sneezeweed (bitterweed, Helenium amarum) in Lick Creek Park. College Station, Texas, June 30, 2012
 Freeze on Fringed sneezeweed (Helenium drummondii) in Lick Creek Park. College Station, Texas, November 15, 2012
 Sneezeweed (Helenium autumnale) along Bee Creek in Anderson Arboretum, in Lemontree park. College Station, Texas, September 23, 2010
 Sneezeweed (bitterweed, Helenium amarum) in dew from Post Oak Trail in Lick Creek Park. College Station, Texas, October 30, 2012
 Opened flower of sneezeweed (bitterweed, Helenium amarum) in dew in Lick Creek Park. College Station, Texas, September 30, 2008
 Large sneezeweed plant (Helenium amarum) on a recent forest clearing in Lick Creek Park. College Station, Texas, August 1, 2021
 Sneezeweed (Helenium) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, August 22, 2013
 Sneezeweed (Helenium) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 29, 2016
 Sneezeweed (Helenium) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 26, 2016
 Sneezeweed (Helenium) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, August 13, 2012
 Morning freeze on sneezeweed (Helenium amarum) on Lick Creek Greenway Trail. College Station, Texas, December 11, 2023
 Sneezeweed (Helenium amarum) in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, October 23, 2019
 Sneezeweed (Helenium amarum) on a parking lot of TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, July 6, 2014
 Fringed sneezeweed (Helenium drummondii) on a parking ground in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 29, 2012
 River below Beach Area in Pedernales Falls State Park. Johnson City, Texas, November 7, 2009
 Lily-like flower of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 10, 2009
 Flowers of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 28, 2017
 Flowers of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Hollow part of a cypress tree in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
 Twin falls in Pedernales Falls State Park, from an overlook. Johnson City, Texas, November 7, 2009
 Hollow part of a cypress tree at sunset in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
 Flowers of Blue curls (Fiddleneck, Phacelia congesta) in McKinney Falls State Park near Austin. Texas, May 10, 2009
 Dark Hollow Falls near Skyline Drive. The Meadow, Virginia, May 16, 2007
 Blue flowers of mealy sage (Salvia farinacea) on opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
 Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
 Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, October 17, 2002
 Givat Rehavam hill cone made of chalk and marl, view from a ridge along Gishron cliffs (trail 20564) 3 miles west from Eilat. The Middle East, January 17, 2002
 Lake below the falls in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Flowers of elegant gayfeather (pinkscale, Liatris hesperelegans, former L. elegans) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, September 23, 2018
 Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, April 11, 2009
 A cemetery at Pretty Prairie Road near Lafayette IN, July 10, 1999.
 Elecampane (Inula helenium) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, June 23, 2009
 Oak forest on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, April 11, 2009
 Chatfield Hollow Brook and a covered bridge in Chatfield Hollow State Park. Killingworth, Connecticut, June 6, 2004
 Chatfield Hollow Brook, view from a covered bridge in Chatfield Hollow State Park. Killingworth, Connecticut, June 6, 2004
 Bark of an oak tree on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, April 11, 2009
 Chalk hills at Nahal Darokh river 4 miles east from Sde Boker. The Middle East, April 9, 2001
 Chalk hills at Nahal Darokh river 4 miles east from Sde Boker. The Middle East, April 9, 2001
 Chalk hills at Nahal Darokh river 4 miles east from Sde Boker. The Middle East, April 9, 2001
 Tributary of Nahal Darokh river going through chalk hills 4 miles east from Sde Boker, view from lower site. The Middle East, April 9, 2001
 Bluestem grass and sneezeweed on utility cutting in Lake Bryan Park. Bryan, Texas, November 18, 2012
 Salsola cyclophylla with tiny yellow flowers near chalk cliffs near Salwa Road in area of Rawdat Ekdaim. Southern Qatar, October 16, 2015
 Salsola cyclophylla with minute yellow flowers near chalk cliffs near Salwa Road in area of Rawdat Ekdaim. Southern Qatar, October 16, 2015
 Death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 28, 2017
 Texture of elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Flower of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Inflorescense of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Blooming death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Close-up of elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Flowers of elegant gayfeather (pinkscale, Liatris hesperelegans, former L. elegans) in Bastrop State Park. Bastrop, Texas, September 10, 2020
 Lily-like flower of death camas (Zigadenus elegans, Anticlea elegans) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 31, 2012
 Orange zinnia flowers (Zinnia elegans) in Dahl Al Hamam Park at Al Markhiya Street. Doha, Qatar, May 30, 2016
 Common zinnia flowers (Zinnia elegans) in Dahl Al Hamam Park at Al Markhiya Street. Doha, Qatar, May 30, 2016
 Falls near Old Lodging Railroad at Upper Otter Creek Overlook at mile 35 of Blue Ridge Parkway. Buena Vista, Virginia, May 17, 2007
 Pink flowers of Violet wood sorrel (Oxalis violacea, shamrock) on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, February 15, 2020
 Chapman Falls and Eightmile River in Devils Hopyard State Park. East Haddam, Connecticut, May 22, 2004
 River downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 River flats in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Cypress roots enveloping a river boulder in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
 Button lichen (Buellia) on limestone near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Cypresses on a river island in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Some whitish lichen on a limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Cypresses and the river in north-east area of Pedernales Falls State Park. Johnson City, Texas, November 6, 2010
 Buffalo bur (Solanum rostratum) in McKinney Falls State Park near Austin. Texas, May 10, 2009
 Flowers of elegant gayfeather (pinkscale, Liatris hesperelegans, former L. elegans) 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 17, 2024
 Opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Button lichen (Buellia) on limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Rusty cypress foliage on a river in north area of Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Entangled cypress roots growing over river boulders in Pedernales Falls State Park. Johnson City, Texas, January 12, 2013
 Blooming cherry like tree in McKinney Falls State Park. Austin, Texas, March 7, 2009
 View from opposite side of the river downstream from Cypress Pool in Pedernales Falls State Park. Johnson City, Texas, November 2, 2008
 Some dark-green crustose lichen on a limestone rock near the river in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Lily-like flower of death camas (Zigadenus elegans, Anticlea elegans) with two-pronged greenish-yellow glands on each petal in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 13, 2010
 Blue curls (Fiddleneck, Phacelia congesta) in McKinney Falls State Park near Austin. Texas, May 10, 2009
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