National parks: DRLCtinaja - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Front yard, Sonoran desert - Public Domain image, National Parks Galle...
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: DRLCRainCapture - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: DRLCHeritageOrchard - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: IMG_2138 - public domain image
Public domain photograph of construction site, free to use, no copyright restrictions image - Picryl description
National parks: IMG_5385 - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: DTor - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: DRLCNativePlants - public domain image
Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
13055734_1150826334969095_7621875355775566355_o (1), Sonoran desert
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: IMG_4543 - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: IMG_2157 - public domain image
Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Flowering pricklypear- free images of flowers
Pricklypear in flower. Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
National parks: Yucca - public domain image
Yucca plant, Fort Bowie NHS Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Saguaro cacti, Sonoran desert - Public Domain image, National Parks Ga...
Saguaro cacti, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Palmer agave, Sonoran desert - Public Domain image, National Parks Gal...
Palmer agave Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cacti with paloverde - Public Domain image, National Parks Gal...
Saguaros and paloverde, Saguaro NP (RMD). These saguaros have far outgrown their nurse trees.
Ocotillo and saguaro - National Parks Gallery
Ocotillo and saguaro, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cactus, Sonoran desert - Public Domain image, National Parks G...
Saguaro cactus with nurse trees and other vegetation. Public domain photograph of nurses, hospital, medical care, free to use, no copyright restrictions image - Picryl description
Saguaro cactus, Sonoran desert - Public Domain image, National Parks G...
Saguaro cactus with nest, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cacti, Sonoran desert - Public Domain image, National Parks Ga...
Saguaro cacti, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaros with paloverde - National Parks Gallery
Saguaros and paloverde, Saguaro NP (RMD). These saguaros have far outgrown their nurse trees.
National parks: Ocotillo - public domain image
Ocotillo in bloom, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Barrel cactus, Sonoran desert - Public domain scenic drawing
Barrel cactus, Saguaro NP (RMD) Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Thornscrub vegetation - National parks scenic trails
Dense underbrush, Massai Nature Trail, Chiricahua National Monument Picryl description: Public domain photograph of National Park, nature, free to use, no copyright restrictions image.
Saguaro cacti, Sonoran desert - Public Domain image, National Parks Ga...
Saguaro cacti, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: Cholla - public domain image
Cholla, Saguaro NP (RMD) Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro cacti and nurse trees - Public Domain image, National Parks Ga...
Saguaros and paloverde, Saguaro NP (RMD). These saguaros have far outgrown their nurse trees.
National parks: Thornscrub - public domain image
Underbrush, Massai Nature Trail, Chiricahua National Monument Picryl description: Public domain photograph of National Park, nature, free to use, no copyright restrictions image.
National parks: 13stabilityequipment.jpg - public domain image
Equipment used for determining soil stability.
Juvenile saguaros, Sonoran desert
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Opuntia skeleton, Sonoran desert
Opuntia skeleton, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of coral reef, underwater life, free to use, no copyright restrictions image - Picryl description
Cholla fruits, Sonoran desert - Public domain drawing
Cholla fruits. Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
National parks: 06pindrop.jpg - public domain image
Vegetation ecologist demonstrates how to set up a plot and conduct the network's vegetation monitoring. A pin (shown near ground, striped red and white) is dropped from the measuring tape above and used to iden... More
Close-up of saguaro cactus - Public Domain image, National Parks Galle...
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Fishhook barrel cactus - National Parks Gallery
Fishhook barrel cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Gambel oak, Sonoran desert - Public Domain image, National Parks Galle...
Gambel oak Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Pincushion cactus, Sonoran desert
Pincushion cactus, Saguaro National Park (Tucson Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: Ironwood - public domain image
Ironwood, Saguaro National Park (Tucson Mountain District), Arizona
Biological soil crust - National Parks Gallery
Biological soil crust Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: Jojoba - public domain image
Jojoba, Saguaro National Park (Tucson Mountain District), Arizona Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Western soapberry, Sonoran desert
Western soapberry, Montezuma Castle National Monument, Arizona.
Cristate saguaro, Sonoran desert
Saguaro with cristate formation Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Collema coccophorum, Sonoran desert
Collema coccophorum Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Saguaro close-up - National Parks Gallery
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro with paloverde and cholla
Saguaro cactus with paloverde and cholla Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Saguaro and nurse tree - Public Domain image, National Parks Gallery
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of nurses, hospital, medical care, free to use, no copyright restrictions image - Picryl description
National parks: Fairyduster - public domain image
Fairyduster, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of a wildflower close up, nature, flowers, free to use, no copyright restrictions image - Picryl description
National parks: Mimosa - public domain image
Mimosa, Montezuma Castle National Monument, Arizona
Western soapberry, Sonoran desert
Western soapberry, Montezuma Castle National Monument, Arizona.
Saguaro cactus, Sonoran desert - Public Domain image, National Parks G...
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: Paloverde - public domain image
Paloverde, Saguaro National Park (Rincon Mountain District), Arizona
Hanging cholla, Sonoran desert - Public domain scenic drawing
Hanging cholla, Saguaro National Park (Rincon Mountain District). Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Pincushion cactus, Sonoran desert
Pincushion cactus, Saguaro National Park (Tucson Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Biological soil crust - National Parks Gallery
Biological soil crust Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Blue grama, Sonoran desert - Public Domain image, National Parks Galle...
Blue grama, Arizona-Sonora Desert Museum, Tucson, Arizona
National parks: 10transfer.jpg - public domain image
Transferting a piece of soil to equipment used for stability testing.
Arizona sycamore, Sonoran desert
Arizona sycamore, Montezuma Castle National Monument. Public domain photograph of tree trunk, free to use, no copyright restrictions image - Picryl description
National parks: 11stability.jpg - public domain image
Vegetation ecologist demonstrates how to set up a plot and conduct the network's vegetation monitoring. This photo depicts a test for soil stability.
National parks: 12stability.jpg - public domain image
Test for soil stability, conducted in accordance with the directions on the top of the box.
National parks: Paloverde - public domain image
Paloverde, Saguaro National Park (Rincon Mountain District), Arizona
National parks: 07categorize.jpg - public domain image
Vegetation ecologist demonstrates how to set up a plot and conduct the network's vegetation monitoring. A pin is dropped from the measuring tape above and used to identify plant height in one of three categorie... More
Arizona sycamore, Sonoran desert
Arizona sycamore, Montezuma Castle National Monument. Public domain photograph - park, sign, monument, free to use, no copyright restrictions image - Picryl description
Teddy bear cholla - National Parks Gallery
Teddy bear cholla Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: 04tapesecure.jpg - public domain image
Vegetation ecologist demonstrates how to set up a plot and conduct the network's vegetation monitoring. In this photo she is securing the tape to the tripod. Measurements are taken along the tape, which marks t... More
National parks: 09knife.jpg - public domain image
Extracting a small piece of soil from the ground for stability testing.
National parks: 03canopy.jpg - public domain image
Measuring tape used to mark plot boundary for Sonoran Desert Network vegetation monitoring. A crew member sampling under this tree would take a reading with the densiometer.
National parks: Datura - public domain image
Datura, Saguaro National Park (Rincon Mountain District), Arizona Public domain scan of drawing, botanical illustration, free to use, no copyright restrictions image - Picryl description
Fishhook barrel cactus flower - Public Domain image, National Parks Ga...
Fishhook barrel cactus Public domain photograph of a wildflower close up, nature, flowers, free to use, no copyright restrictions image - Picryl description
Biological soil crust - National Parks Gallery
Biological soil crust Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Juvenile saguaro, Sonoran desert
The spines of juvenile saguaro cacti are denser than those of mature plants. Saguaro National Park (Rincon Mountain District), Arizona.
Top of organ pipe cactus - Public Domain image, National Parks Gallery
Organ pipe cactus Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: placidium - public domain image
placidium Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Pencil cholla, Sonoran desert - Public Domain image, National Parks Ga...
Pencil cholla, Saguaro National Park (Rincon Mountain District), Arizona
Saguaro flowers- free images of flowers
Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
National parks: 01equipment.jpg - public domain image
Equipment used for Sonoran Desert Network vegetation monitoring.
National parks: 05tape.jpg - public domain image
Measuring tape used to mark plot boundary for Sonoran Desert Network vegetation monitoring.
Collema tenax, Sonoran desert - Public Domain image, National Parks Ga...
Collema tenax Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: Densiometer - public domain image
Densiometer used for Sonoran Desert Network vegetation monitoring. This device is akin to a periscope; the user looks into one of the horizontal tubes to judge canopy cover overhead.
National parks: 08biocrust.jpg - public domain image
Vegetation ecologist demonstrates how to set up a plot and conduct the network's vegetation monitoring. Here, she uses a collapsible quadrat to sample for biological soil crusts.
Peltula richardsii, Sonoran desert
Peltula richardsii Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: Creosotebush - public domain image
Creosotebush, Montezuma Castle NM Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
National parks: Featherplume - public domain image
Featherplume at Montezuma Well Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Globemallow with bee - National Parks Gallery
Globemallow, Montezuma Well Public domain photograph by National Parks Administration, nature conservation, tourism, free to use, no copyright restrictions image - Picryl description
Aspen grove, Sonoran desert - Public Domain image, National Parks Gall...
Aspen grove, Saguaro National Park Public domain photograph of timber industry, lumber, free to use, no copyright restrictions image - Picryl description
Saguaro with freeze damage - Public Domain image, National Parks Galle...
Freeze damage to saguaro cactus. Public domain photograph of cactus plant, free to use, no copyright restrictions image - Picryl description
Organ pipe cactus at Saguaro NP
Organ pipe cactus growing at Saguaro NP. The Sonoran Desert Network vegetation mapping field crew found this single organ pipe cactus individual growing at the Tucson Mountain District of Saguaro NP in February... More