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grassy slope of volcanic rhyolite tuff rubble just below cliffs at upper canyon rim. This old switchback road has now been replaced with a new paved highway to Batopilas that greatly limits access to many former rich roadside collecting sites in the canyon.
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lower canyon terrace in volcanic rhyolitic tuff gravels
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on rock face, cliffs of volcanic rhyolitic tuff along margins of Rio Sirupa, with Agave multifilifera, Dasylirion species, Gossypium thurberi
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grassy opening in woodland on volcanic rhyolitic tuff hillside.
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grassy opening in woodland on volcanic rhyolitic tuff hillside.
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on limestone ledges of low hillside slope with Hechtia texensis.
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on limestone ledges of low hillside slope with Hechtia texensis.
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on limestone ledges of low hillside slope with Hechtia texensis.
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine. Note scarious margined scales on fruit
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine. Note scarious margined scales on fruit
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine. Note scarious margined scales on fruit
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine. Note scarious margined scales on fruit
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine. Note scarious margined scales on fruit
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large solitary succulent with large, thick, semi-tubercled ribs with long reddish spreading spines around an even longer rather vicious hooked yellow spine.
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plants on an open exposed rockface of gypseous limestone of a foothill on the NW edge of the Sierra Parras, with Jatropha dioica, Agave asperrima, Opuntia rufida, Sericodes greggii, Sengalia crassifolia and other cacti species.
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annual in calcareous soil of road right-of-way crossing gently sloping overgrazed grassland of the Playas bolson with Flourensia cernua, Isocoma tenuisecta.
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annual in calcareous soil of road right-of-way crossing gently sloping overgrazed grassland of the Playas bolson with Flourensia cernua, Isocoma tenuisecta.
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erect slender stemmed succulent on mixed alluvial gravels of pale limestone and reddish volcanic rhyolite on bank of shallow wash.
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on road right of way crossing overgrazed, shrub invaded grassland on basin fill flats of mixed limestone and volcanic gravels over calcareous soil. Note sheathed spines.
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n road right of way crossing overgrazed, shrub invaded grassland on basin fill flats of mixed limestone and volcanic gravels over calcareous soil. Distinctive fruit, ripe and unripened