Ariocarpus
genus Ariocarpus
Pediocactus
genus Pediocactus
Opuntia cholla
cholla
Carlsbad Caverns
Middle America
Texas chachalaca
Ortilis vetula macalli
rainbow cactus
Dead Negro Draw
perennial ragweed
western ragweed
Ambrosia psilostachya
economic geology
Lophophora
genus Lophophora
Armeria maritima
sea pink
Mephitis macroura
Montezuma cypress
cliff rose
Taxodium mucronatum
Guanajuato
geoformation
Mexican swamp cypress
pedregal
hooded skunk
Euphorbia antisyphilitica
Mojave rattlesnake
genus Ferocactus
candelilla
Ferocactus
pedosediment
Crotalus scutulatus
Guadalupe Mountains
genus Schlumbergera
geologically
Schlumbergera
geosurvey
New Mexico
Mesoamerica
N.M.
Land of Enchantment
NM
Veracruz
Coahuila
Los Angeles Basin
Erodium texanum
mediocaudal
myrtle oak
Texas storksbill
seaside scrub oak
Guiana
Quercus myrtifolia
Appalachian Mountains
Chihuahuan Desert
Appalachians
Nyctaginia capitata
scarlet musk flower
genus Myrtillocactus
Myrtillocactus
Whitbian
geolimnological
Fraxinus velutina
genus Echinocereus
Arizona ash
Coast Mountains
Quintana Roo
Coast Range
Central America
sedimentologically
Echinocereus
Azcapotzalco
Big Thicket
Atriplex lentiformis
quail brush
quail bush
genus Aporocactus
Aporocactus
geoaccumulation
white thistle
Selaginella rupestris
banded rattlesnake
dwarf lycopod
Anemone virginiana
timber rattlesnake
Lower California
Baja California Peninsula
geosorbent
rock spikemoss
dirt bed
Crotalus horridus horridus
sedimentology
Baja California
Virginia thimbleweed