 Prickly pears near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain with prickly pears cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 Guadalupe spring from El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain Trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 Rocks and El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 Split rock and El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Trail and Mountain in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain and Trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Hedgehog cactus near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 View from beginning of El Capitan Trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Dead tree from El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Cactus on rocks of El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Agaves and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Cushion cactus and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Agave, cacti and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Alligator juniper (Juniperus deppeana) near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Magenta tinged echinocereus hedgehog actus on El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain (zoomed), view to the west in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain from a trail at the foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain at sunset, view from lower Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain, view from upper Roadside Park at morning. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain after sunset, view from lower Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain, view from lower Roadside Park at morning. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain with cholla cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain from southern foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain at sunset, view from lower Roadside Park south from the mountain. Guadalupe Mountains National Park, Texas, December 28, 2007
 Purple spineless prickly pears cactus in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Magenta tinged prickly pears cactus on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Agave on McKittrick Canyon Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Slopes of Frijole Mountain from McKittrick Canyon Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Rocks on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Dead juniper on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hiker s staircase in Pine Spring Canyon, on Devils Hall Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Frozen McKittrick Creek. Guadalupe Mountains National Park, Texas, December 28, 2007
 Grotto in McKittrick Canyon, with icicles. Guadalupe Mountains National Park, Texas, December 28, 2007
 Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hunter Line Cabin in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Bark of alligator juniper in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Big rocks near Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Rocks in Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Texas madrone (Arbutus xalapensis) on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Peeling bark of Texas madrone on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Smooth white bark of Texas madrone on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Echinocereus cacti growing on ruins of Hunter Line shack in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Upper section of Hiker s Staircase near Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Texas madrone in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Prickly pears cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Prickly pears cactus on a small ridge near Juniper Canyon Trail south from Upper Juniper Spring. Big Bend National Park, Texas, November 22, 2007
 Yucca on a hill west from entrance in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Prickly pears cactus near Fishing Beach. Sandy Hook, New Jersey, March 11, 2007
 Prickly pears cactus (zoomed) near Fishing Beach. Sandy Hook, New Jersey, March 11, 2007
 Soaptree yucca (Yucca elata) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Blooming prickly pears (Opuntia) in Lick Creek Park. College Station, Texas, May 4, 2023
 Prickly pears cactus on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Yellow flowers of prickly pears (Opuntia) in Birch Creek Unit of Lake Somerville State Park, Texas, April 29, 2012
 Scaly stippled lichen (Endocarpon pusillum) on a thin layer of soil over exposed limestone rocks overgrown by prickly pears near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Dark crust of scaly stippled lichen (Endocarpon pusillum) on a thin layer of soil over exposed limestone rocks overgrown by prickly pears in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Purple-tinged prickly pear cactus in the middle part of Smokey Creek Trail. Big Bend National Park, Texas, November 25, 2007
 Prickly pears (sabra) cactus on the roadside in Nizzanim. The Middle East, July 19, 2001
 Young pad of prickly pears (Opuntia) in Antique Rose Emporium. Independence, Texas, March 31, 2020
 Soaptree yucca (Yucca elata) in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium in Independence. Texas, March 22, 2009
 Flower bud of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
 Purple-tinged prickly pear cactus on Smokey Creek Trail near Trap Spring east from Mule Ear Overlook. Big Bend National Park, Texas, November 25, 2007
 Vegetative shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
 Rapidly growing vegetative shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
 Snail feeding on a fresh young pad of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
 Prickly pears cactus (known as sabra in Israel) in downtown Beer-Sheva, at intersection of Rager and Tuvyahu Street. The Middle East, February 18, 2000
 Pad of prickly pears (Opuntia) with a bug in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 22, 2022
 Prickly pears in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 16, 2011
 Spotted cucumber beetle (Diabrotica undecimpunctata) on a shoot of prickly pears cactus in Ladybird Johnson Wildflower Center. Austin, Texas, March 7, 2009
 Pad of prickly pears in a forest in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Prickly pears (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 21, 2020
 Prickly pears (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 3, 2022
 Yellow flowers of prickly pears (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 3, 2020
 Fruits of prickly pears (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, July 29, 2009
 Fruits of prickly pears (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, September 10, 2012
 Dried sap of prickly pears cactus (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 8, 2009
 Sprout of prickly pears cactus (opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 6, 2008
 New growth of prickly pears cactus (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 1, 2009
 Skeleton of a dry pad of prickly pears cactus (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 1, 2024
 Blooming prickly pears cactus (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 30, 2011
 Skeleton of a dry pad of prickly pears cactus (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 1, 2020
 Dry pad skeleton of prickly pears cactus (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 13, 2020
 Blooming Prickly pears (Opuntia) cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 26, 2009
 Emerging sprout (new pad) of prickly pears cactus (opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 6, 2008
 Fresh pads of prickly pears (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 21, 2020
 Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Color guard yucca (Yucca filamentosa) in Antique Rose Emporium. Independence, Texas, April 4, 2022
 Rapidly growing vegetative shoot of prickly pears cactus (Opuntia) with fleshy, green, leaf-like phylloclades in Antique Rose Emporium. Independence, Texas, April 19, 2009
 Cliff above Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 A view from Clingmans Dome. Smoky Mountains National Park, Tennessee, May 18, 2007
 A view from Newfound Gap Road. Smoky Mountains National Park, Tennessee, May 18, 2007
 On a hill south from Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Prickly pears (Opuntia) on exposed limestone rocks near a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 18, 2020
 Prickly pears (Opuntia) near Howdy Haus at Floriculture Road in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, August 3, 2022
 Oconaluftee River near Newfound Gap Road. Smoky Mountains National Park, Tennessee, May 18, 2007
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