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
Yellow flowers of Prickly pear cactus (Opuntia) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
Lace cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 14, 2008
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
New growth shoot (apical meristem) of Opuntia cactus (pricly pears) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 17, 2009
Yellow flowers of a cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, July 31, 2009
Cholla cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
Lace cactus (Echinocereus reichenbachii) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 5, 2008
Close-up of a flower of Claret cup cactus in Ladybird Johnson Wildflower Center. Austin, Texas, March 7, 2009
Purple spineless prickly pears cactus in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
Nipple cactus (Coryphantha) with fruits in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, June 12, 2008
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
Apical meristem of a potted cactus in Antique Rose Emporium. Independence, Texas, August 15, 2009
Claret cup cactus (Echinocereus triglochidiatus) north from Capulin Canyon in Bandelier National Monument. New Mexico, near Los Alamos, May 24, 2008
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
Blooming prickly pear cactus north from Capulin Canyon in Bandelier National Monument. New Mexico, near Los Alamos, May 24, 2008
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
Claret cup cactus flower north from Capulin Canyon in Bandelier National Monument. New Mexico, near Los Alamos, May 26, 2008
Flower buds on a cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, March 26, 2009
Blooming Lace cactus (Echinocereus reichenbachii) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 26, 2009
Sprout of prickly pears cactus (opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 6, 2008
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
Pistils and stamens of a flower of lace cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 20, 2008
Prickly pears cactus on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
Blooming Prickly pears (Opuntia) cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 26, 2009
Orange flowers of Prickly pear cactus (Opuntia) on Savanna Meadow Trail in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
Cane Cholla cactus and Southeast Rim, view from east part of Dodson Trail. Big Bend National Park, Texas, November 23, 2007
Purple flower of lace cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 14, 2008
Claret cup cactus near Yapashi in Bandelier National Monument. New Mexico, near Los Alamos, May 25, 2008
Prickly pears (sabra) cactus on the roadside in Nizzanim. The Middle East, July 19, 2001
Young Golden barrel cactus (Echinocactus grusonii) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 27, 2009
Rapidly growing vegetative shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
Magenta tinged prickly pears cactus on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
Lace cactus (Echinocereus reichenbachii) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, January 27, 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
Hedgehog cactus (Echinocereus viridiflorus) on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
Purple-tinged prickly pear cactus in the middle part of Smokey Creek Trail. Big Bend National Park, Texas, November 25, 2007
El Capitan Mountain with prickly pears cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 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
Christmas cholla cactus (Tasajillo, Opuntia leptocaulis) on Homestead Trail in McKinney Falls State Park. Austin, Texas, October 26, 2008
Fruit of cholla cactus (cylindropuntia) on Blue Creek Trail. Big Bend National Park, November 29, 2009
Cactus with edible fruits at Ben Gurion Boulevard. Beer-Sheva, the Middle East, August 24, 2002
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
Vegetative shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
New growth of prickly pears cactus (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 1, 2009
Cactus with water drops in Antique Rose Emporium. Independence, Texas, December 12, 2009
Prickly pears cactus near Fishing Beach. Sandy Hook, New Jersey, March 11, 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
Cactus on rocks of Smokey Creek. Big Bend National Park, Texas, November 25, 2007
Flower bud of prickly pears cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, April 19, 2009
Rapidly growing vegetative shoot of prickly pears cactus (Opuntia) with fleshy, green, leaf-like phylloclades in Antique Rose Emporium. Independence, Texas, April 19, 2009
Cactus with flower buds in a greenhouse of a plant shop "Rasteniya Vsekh Stran Mira" in Chkalov Sanatorium. Odessa, Ukraine, July 3, 2009
Hedgehog cactus near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
Spotted cucumber beetle (Diabrotica undecimpunctata) on a shoot of prickly pears cactus in Ladybird Johnson Wildflower Center. Austin, Texas, March 7, 2009
Shoot of prickly pears cactus (Opuntia) in Antique Rose Emporium in Independence. Texas, March 22, 2009
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
Cactus in roadside dump at Ben Gurion Boulevard. Beer-Sheva, the Middle East, August 24, 2002
Prickly pear cactus on Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
Prickly pears cactus in snow near a road between White s City and Carlsbad Caverns. New Mexico, December 26, 2007
Cactus on rocks of El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
El Capitan Mountain with cholla cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 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) on a pad of prickly pear in Antique Rose Emporium. Independence, Texas, August 7, 2010
Pitaya(?) cactus on Smokey Creek Trail east from Mule Ear Spring. Big Bend National Park, Texas, November 25, 2007
Button cactus (Epithelantha micromeris) with red fruits in Ladybird Johnson Wildflower Center. Austin, Texas, May 10, 2009
Cactus in roadside dump at Ben Gurion Boulevard. Beer-Sheva, the Middle East, August 24, 2002
Cushion cactus and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
- Caprock Canyons 11/2/97 - Tasajillo (Christmas cactus) (Caprock Canyons State Park - Dallas, November 2 - 8, 1997)
Snail feeding on a green pad of prickly pear cactus (Opuntia) in Antique Rose Emporium in Independence. Texas, May 3, 2009
Apical meristem of a cactus in a greenhouse of a plant shop "Rasteniya Vsekh Stran Mira" in Chkalov Sanatorium. Odessa, Ukraine, July 3, 2009
Prickly pears cactus (zoomed) near Fishing Beach. Sandy Hook, New Jersey, March 11, 2007
Apical meristem of a cactus in Antique Rose Emporium. Independence, Texas, August 15, 2009
A cactus near Stove House of New Orleans Botanical Garden. Louisiana, April 17, 2005.
Claret cup cactus (Echinocereus triglochidiatus) in Ladybird Johnson Wildflower Center. Austin, Texas, March 7, 2009
Pad of pricly pears (opuntia) cactus with snow in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, December 10, 2008
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 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
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
Dried sap of prickly pears cactus (Opuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, May 8, 2009
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
Cholla cactus (cylindropuntia) in Antique Rose Emporium. Independence, Texas, August 15, 2009
Blooming prickly pears cactus (Opuntia) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 30, 2011
Yellow cactus flowers in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, September 8, 2011
Yellow flowers on a cactus in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, September 8, 2011
Yellow flowers of Prickly pear cactus (Opuntia) in dew in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 19, 2012
Blooming cholla cactus(cylindropuntia) in TAMU Horticultural Gardens in Texas A and M University. College Station, Texas, April 26, 2012
Spiny cactus in Antique Rose Emporium. Independence, Texas, May 13, 2012
Echinopsis cactus in Antique Rose Emporium. Independence, Texas, May 13, 2012
Tender young pads or nopalitos of prickly pear cactus (Opuntia) in Antique Rose Emporium. Independence, Texas, May 13, 2012
Christmas cactus (Tasajillo, Cylindropuntia leptocaulis) on a fence at Road 322 south from Milano. Texas, December 1, 2012
Tasajillo (Cylindropuntia) cactus taken from a fence at Road 322 south from Milano. College Station, Texas, December 2, 2012
