Mammillaria heyderi
in South Texas
In Astrophytum asterias habitat in Starr County, Texas.
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Notice the drought-induced predation?
Occurring with Lophophora williamsii east of Rio Grande City in Starr County, Texas.
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Growing with Lophophora williamsii in Jim Hogg County, Texas.
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The following are archival images:
In habitat in Hidalgo Co, Texas.
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This page shows good examples of the sort of M. heyderi sometimes referred to as "hemisphaerica".
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