 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
 Pitaya(?) cactus on Smokey Creek Trail east from Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Cactus on rocks of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Agave on Smokey Creek Trail. Big Bend National Park, Texas, November 24, 2007
 Mule Ear Peaks from Smokey Creek Trail. Big Bend National Park, Texas, November 25, 2007
 Cane Cholla cactus and Southeast Rim, view from east part of Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Smokey Creek Trail north from Mule Ear Peaks. Big Bend National Park, Texas, November 25, 2007
 Smokey Creek Trail east from Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Ocotillo on Smokey Creek Trail north from Mule Ear Peaks. Big Bend National Park, Texas, November 25, 2007
 Dallas Sierra Club on Smokey Creek Trail at rain. Big Bend National Park, Texas, November 24, 2007
 Bee Mountain, view to the west from Smokey Creek Trail near Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Desert mistletoe(?) growing on ocotillo, view from Smokey Creek Trail. 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
 Valley of Smokey Creek, view to the east from a trail north from Mule Ear Peaks. Big Bend National Park, Texas, November 25, 2007
 Smokey Creek Trail through creosote bushes and cacti east from Mule Ear Overlook. Big Bend National Park, Texas, November 25, 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
 Smokey Creek Trail near Trap Spring east from Mule Ear Overlook, view to the west. Big Bend National Park, Texas, November 25, 2007
 Santa Elena Canyon west from Smokey Creek Trail east from Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Redeye prickly pear cactus (Engelmann prickly pear, Opuntia phaeacantha var. discata) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
 Canyon of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Pour-off of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
 Trap Mountain(?) west from Smokey Creek Trail near Trap Spring east from Mule Ear Overlook. Big Bend National Park, Texas, November 25, 2007
 Mule Ear Peaks east from Smokey Creek Trail east from Mule Ear Overlook. Big Bend National Park, Texas, November 25, 2007
 Prickly pear cactus on Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Cacti on east part of Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Magenta tinged prickly pears cactus on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Lower (flat) part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Northeast Rim, view from lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Sotol and Southeast Rim, view from east part of Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Crown Mountain, view from lower part of Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Fruit of cholla cactus (cylindropuntia) on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Blooming prickly pear cactus north from Capulin Canyon in Bandelier National Monument. New Mexico, near Los Alamos, May 24, 2008
 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
 Cactus coreid bug Chelinidea vittiger on a pad of prickly pear cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, September 12, 2008
 Cactus coreid bug Chelinidea vittiger nymph on a pad of prickly pear cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, September 29, 2008
 Yellow flowers of Prickly pear cactus (Opuntia) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
 Orange flowers of Prickly pear cactus (Opuntia) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
 Nymphs of cactus bug Chelinidea vittiger feeding on prickly pear cactus (discolored areas of opuntia is the result of punctures) in TAMU Holistic Garden in Texas A and M University. College Station, Texas, May 11, 2008
 Magenta tinged echinocereus hedgehog actus on El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Upper part of Boot Canyon Trail. Big Bend National Park, November 27, 2009
 Purple spineless prickly pears cactus in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 El Capitan Mountain with prickly pears cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 Yellow and orange flowers of Engelmann prickly pear cactus (Opuntia phaeacantha var. discata) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
 Cactus coreid bug (Chelinidea vittiger) on a pad of prickly pear in Antique Rose Emporium. Independence, Texas, August 7, 2010
 Snail feeding on a green pad of prickly pear cactus (Opuntia) in Antique Rose Emporium in Independence. Texas, May 3, 2009
 Tender young pads or nopalitos of prickly pear cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, May 13, 2012
 Boot Rock, view from Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Weathered wood on Pinnacles Trail near Juniper Flat. Big Bend National Park, Texas, November 22, 2007
 Fresno Circle campsite near Dodson Trail at evening. Big Bend National Park, Texas, November 23, 2007
 South Rim, view from Fresno Circle campsite near Dodson Trail. Big Bend National Park, Texas, November 23, 2007
 Elephant Tusk Rock, view from Fresno Spring near Dodson Trail. Big Bend National Park, Texas, November 24, 2007
 Tender young pad or nopalitos of prickly pear cactus (opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, March 31, 2009
 Fruits of Texas madrone (Arbutus xalapensis) on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Switchbacks of Blue Creek Trail. Big Bend National Park, November 29, 2009
 Yellow flowers of Prickly pear cactus (Opuntia) in dew in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2012
 Prickly pears near 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
 Hedgehog cactus near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Upper part of Boot Canyon. Big Bend National Park, November 27, 2009
 Area of red rocks on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Prickly pears and yucca near El Capitan Trail. 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
 Coreid bugs Chelinidea vittiger (adult with feeding nymph) on a pad of prickly pear cactus (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, October 7, 2008
 Camping on a small ridge near Juniper Canyon Trail south from Upper Juniper Spring. Big Bend National Park, Texas, November 22, 2007
 One of eroded pinnacles of pink volcanic tuff on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Prickly pears cactus on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Eroded pinnacles of pink volcanic tuff looking like a miniature Bryce Canyon on Blue Creek Trail. Big Bend National Park, November 29, 2009
 Fresno Spring at evening. Big Bend National Park, Texas, November 23, 2007
 Ruins of Dodson Ranch. Big Bend National Park, Texas, November 23, 2007
 Tender young pad or nopalitos of prickly pear cactus with glossy wax coating and fresh areolas bearing leaf primordia, spines and tufts of glochids (barbed hairs) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, March 31, 2009
 Rapidly growing vegetative shoot of prickly pear cactus (opuntia) with glossy wax coating and fresh areolas bearing leaf primordia, spines and tufts of glochids in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 1, 2009
 Tender young pad or nopalitos of prickly pear cactus (opuntia) with glossy wax coating and fresh areolas bearing leaf primordia, spines and tufts of glochids (barbed hairs) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, March 31, 2009
 Rapidly growing vegetative shoot of prickly pear cactus with glossy wax coating and fresh areolas bearing leaf primordia, spines and tufts of glochids (barbed hairs) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 1, 2009
 Maiden ferns at Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
 Blue flower of Purple dewdrop (Lobelia puberula) on Little Lake Creek Loop Trail in Sam Houston National Forest. Texas, November 1, 2008
 Chisos Mountains with snow, view from Castalon Highway. Big Bend National Park, Texas, November 25, 2007
 Century plant and Elephant Tusk Mountain, view from South Rim. Big Bend National Park, Texas, November 22, 2007
 Boot Spring Trail. Big Bend National Park, November 26, 2009
 Emory Peak Trail in fog. Big Bend National Park, November 27, 2009
 Chisos Mountains with traces of snow, view from Castalon Highway (Ross Maxwell Scenic Drive). Big Bend National Park, Texas, November 25, 2007
 Little Lake Creek Loop Trail in mist in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Grasses on Little Lake Creek Loop Trail in mist in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Upper section of Boot Canyon Trail. Big Bend National Park, November 27, 2009
 Slopes of Chisos Mountains from Pinnacles Trail. Big Bend National Park, November 26, 2009
 Boot Canyon Trail ending at Southeast Rim. Big Bend National Park, November 27, 2009
 Pines at sunrise in mist on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Pine and sumach in mist on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Burned pine and sumach near Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Fall colors of Chisos Mountains from Pinnacles Trail. Big Bend National Park, November 26, 2009
 Cliffs of Toll Mountain from Boot Spring Trail. Big Bend National Park, November 26, 2009
 Slopes of Chisos Mountains from Boot Spring Trail. Big Bend National Park, November 26, 2009
 Emory Peak from lower section of Southwest Rim Trail. Big Bend National Park, November 28, 2009
 El Capitan Mountain with cholla cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 Pine trees in mist at morning near Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, November 3, 2007
 Slopes of Chisos Mountains east from Boot Spring Trail. Big Bend National Park, November 27, 2009
 Century plant which bloomed, died, and tipped over, on Pinnacles Trail. Big Bend National Park, November 26, 2009
 Group of people with Dallas Sierra Club on Pinnacles Trail. Big Bend National Park, November 26, 2009
 Prickly pears cactus near Fishing Beach. Sandy Hook, New Jersey, March 11, 2007
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