 El Capitan Mountain with prickly pears cactus in foreground, view from upper 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 at sunset, view from lower Roadside Park south from the mountain. Guadalupe Mountains National Park, Texas, December 28, 2007
 Cushion cactus and El Capitan Mountain from a trail in 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 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 (zoomed), view to the west 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
 El Capitan Mountain 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 Mountain from a trail at the foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain from southern foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 Cactus on rocks of El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Hedgehog cactus near El Capitan Trail. 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
 El Capitan Trail and Mountain in 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
 Agave, cacti and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Guadalupe spring from 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
 Prickly pears near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Prickly pears and yucca near El Capitan Trail. 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
 Slopes of Frijole Mountain from McKittrick Canyon Trail. 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
 Cane Cholla cactus and Southeast Rim, view from east part of Dodson Trail. Big Bend National Park, Texas, November 23, 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
 Agave on McKittrick Canyon Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Bark of alligator juniper in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hunter Line Cabin 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
 Rocks 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
 Dead juniper 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
 Texas madrone in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Cholla cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
 Peeling bark of Texas madrone on Devils Hall Trail 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
 Smooth white bark of Texas madrone on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Purple spineless prickly pears cactus in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Hedgehog cactus (Echinocereus viridiflorus) on northern hill 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
 Fruit of cholla cactus (cylindropuntia) on Blue Creek Trail. Big Bend National Park, November 29, 2009
 View from a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 View of a slope of Colony Baldy Mountain from Macey Lakes Trail in Sangre de Cristo Mountains. Colorado, July 2, 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
 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
 Echinocactus horizonthalonius (devil s head cactus, or horse crippler) with daggerlike spines on a small ridge near Juniper Canyon Trail south from Upper Juniper Spring. Big Bend National Park, Texas, November 22, 2007
 Dwarf sunflowers (Old-man-of-the-mountain, Rydbergia grandiflora, Hymenoxys grandiflora) on a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Century plant and Elephant Tusk Mountain, view from South Rim. Big Bend National Park, Texas, November 22, 2007
 Chisos Mountains with snow, view from Castalon Highway. Big Bend National Park, Texas, November 25, 2007
 Crown Mountain, view from lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Bee Mountain, view to the west from Smokey Creek Trail near Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Goat Mountain, view to the north from Smokey Creek Trail near Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) on Homestead Trail in McKinney Falls State Park. Austin, Texas, October 26, 2008
 Chisos Mountains with traces of snow, view from Castalon Highway (Ross Maxwell Scenic Drive). Big Bend National Park, Texas, November 25, 2007
 Lower Macey Lake and Little Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 2, 2007
 Cholla cactus (cylindropuntia) in Antique Rose Emporium. Independence, Texas, August 15, 2009
 A dried tree on a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Crestone Peak from a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Alpine tundra on a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Alpine primrose(?) (Primula angustifolia) on Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Hairy Androsace and deer clover on Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Alpine phlox(?) flowers on the slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Mountain laurel flowers on Blue Trail in DeSoto State Park on Lookout Mountain. Fort Payne, Alabama, May 19, 2007
 View from Scenic Overlook Trail with old stone latrine in foreground revealed by fire in Bastrop State Park. Bastrop, Texas, December 25, 2011
 A dead tree and Reiser Prairie from a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Sulphur flower buckwheat (Eriogonum umbellatum) on Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Pink flowers of Moss campion (Silene acaulis) on Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Dwarf alpine deer clover (Trifolium nanum) on Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Cactus on rocks of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Alpine Sandwort (Lidia obtusiloba, Minuartia biflora) on a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Alpine forget-me-not (Eritrichum aretioides) flowers carpeting the slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Dwarf cinquefoil and white alpine phlox wildflowers on a slope of Colony Baldy Mountain in Sangre de Cristo Mountains. Colorado, July 3, 2007
 El Capitan and valley of Merced River from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
 Upper view of short-stemmed slippery jack mushrooms (Suillus brevipes) on mowed roadside of Road 149 on South Wilderness Loop Trail at Little Lake Creek Wilderness in Sam Houston National Forest near Richards. Texas, December 26, 2021
 A path in Delaware and Raritan Canal State Park, with a milestone in foreground. North from Kingston, New Jersey, May 7, 2007
 Paper-spined cholla cactus (Opuntia articulata) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, July 18, 2014
 Paper-spined cholla cactus (Opuntia articulata) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, July 20, 2013
 View to the south from south side of Mountain Lakes in John Witherspoon Woods park. Princeton, New Jersey, April 28, 2007
 El Capitan, Half Dome and valley of Tenaya Creek from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
 Flower of Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) in a ranch at 7278 Batts Ferry Road. College Station, Texas, August 1, 2014
 Fruits of Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) in a ranch at 7278 Batts Ferry Road. College Station, Texas, August 1, 2014
 Flowers of Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) in a ranch at 7278 Batts Ferry Road. College Station, Texas, August 1, 2014
 Blooming Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) in a ranch at 7278 Batts Ferry Road. College Station, Texas, August 1, 2014
 Blooming cholla cactus(cylindropuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 26, 2012
 Flower and fruits of Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) in a ranch at 7278 Batts Ferry Road. College Station, Texas, August 1, 2014
 Pitaya(?) cactus on Smokey Creek Trail east from Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Mountains Kuhe-Gondeshlu (2009 m) and Kuhe-Sebz (2043 m), with cities of Gondeshlu in foreground and Aliabade-Nakn and Marvdasht in background, in Fars Province of Iran. View from a window of a plane from Doha, Qatar to Houston, TX, March 16, 2010.
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