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on exposure of weathered granite of steep igneous hillside. Mature plant dwarfed by thin substrate, wind and extremely xeric conditions with moisture largely provided by coastal fog
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in thorn scrub thicket on coarse granitic soil of gently sloping coastal plain.
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Tree in thorn scrub thicket on coarse granitic soil of gently sloping coastal plain. Close-up view of trunk bark
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in thorn scrub thicket on coarse granitic soil of gently sloping coastal plain. Note swollen (sarcocaulescent)trunk, distinctive to the Bursera, which serves to store moisture during periods of drought
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in the rich sarcocaulescent community on hillside slopes of Cerro Colorado
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in the rich sarcocaulescent community on hillside slopes of Cerro Colorado
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transition area at southern margins of San Felipe Desert
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Canyon hillside above Rio Sonora, rocky volcanic slope
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Canyon hillside above Rio Sonora, rocky volcanic slope
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Canyon hillside above Rio Sonora,on rocky volcanic slope
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Fruit view. Plants on fine silty volcanic soil of a gently sloping plain with good diversity of cacti and shrub cover but a paucity of forbs or grasses resulting from a long history of overgrazing
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leaf view. Plants on fine silty volcanic soil of a gently sloping plain with good diversity of cacti and shrub cover but a paucity of forbs or grasses resulting from a long history of overgrazing
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Trunk view. Plants on fine silty volcanic soil of a gently sloping plain with good diversity of cacti and shrub cover but a paucity of forbs or grasses resulting from a long history of overgrazing
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overall habit view. Plants on fine silty volcanic soil of a gently sloping plain with good diversity of cacti and shrub cover but a paucity of forbs or grasses resulting from a long history of overgrazing
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plant in habitat on coarse gravelly volcanic soil of large, wide, braided sheet-wash arroyo draining coastal plain between rhyolite hills, with Diphysa occidentalis, Caesalpinia palmeri, Acacia willardiana, Randia thurberi, Melochia speciosa, Colubrina viridis, Randia thurberi.
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Trunk view, plant on coarse gravelly volcanic soil of large, wide, braided sheet-wash arroyo draining coastal plain between rhyolite hills, with Diphysa occidentalis, Caesalpinia palmeri, Acacia willardiana, Randia thurberi, Melochia speciosa, Colubrina viridis, Randia thurberi.
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Habitat view, plant on coarse gravelly volcanic soil of large, wide, braided sheet-wash arroyo draining coastal plain between rhyolite hills, with Diphysa occidentalis, Caesalpinia palmeri, Acacia willardiana, Randia thurberi, Melochia speciosa, Colubrina viridis, Randia thurberi.
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Habit view, plant on coarse gravelly volcanic soil of large, wide, braided sheet-wash arroyo draining coastal plain between rhyolite hills, with Diphysa occidentalis, Caesalpinia palmeri, Acacia willardiana, Randia thurberi, Melochia speciosa, Colubrina viridis, Randia thurberi.
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Foliage view, plant on coarse gravelly volcanic soil of large, wide, braided sheet-wash arroyo draining coastal plain between rhyolite hills, with Diphysa occidentalis, Caesalpinia palmeri, Acacia willardiana, Randia thurberi, Melochia speciosa, Colubrina viridis, Randia thurberi.
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View fruit. Shrubby tree on coarse granitic igneous gravels along shallow wash cutting a gently sloping, open coastal plain with Bursera hindsiana, Solanum hindsianum, Lycium andersonii, Simmondsia chinensis, Euphorbia misera, Pachycereus schottii
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View fruit. Shrubby tree on coarse granitic igneous gravels along shallow wash cutting a gently sloping, open coastal plain with Bursera hindsiana, Solanum hindsianum, Lycium andersonii, Simmondsia chinensis, Euphorbia misera, Pachycereus schottii