Field number : L 602
Collector : Alfred Bernhard Lau
Species : Mammillaria sheldonii 
Locality : Mexicó : Sonora (Arrieros , between Guaymas and Hermosillo 50m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Rathbunia sonorensis, Marshallocereus thurberi
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http://www.mammillarias.net
Field number : LAU 602
Collector : Alfred Bernhard Lau
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Arrieros , between Guaymas and Hermosillo 50m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Rathbunia sonorensis, Marshallocereus thurberi
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http://www.mammillarias.net
Field number : L 606
Collector : Alfred Bernhard Lau
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (North of Bahia Kino 100m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Ferocactus emoryi, Carnegiea gigantea, Pachycereus pringlei
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http://www.mammillarias.net
Field number : LAU 606
Collector : Alfred Bernhard Lau
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (North of Bahia Kino 100m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Ferocactus emoryi, Carnegiea gigantea, Pachycereus pringlei
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http://www.mammillarias.net
Field number : GLF 1518
Collector : Charles (Charlie) Edward Glass, Robert Alan (Bob) Foster (also see notes)
Species : Mammillaria sheldonii
Locality : 7 miles out of Alamos, towards San Pedro, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : GLF 2056
Collector : Charles (Charlie) Edward Glass, Robert Alan (Bob) Foster (also see notes)
Species : Mammillaria sheldonii
Locality : 2 miles from Guasimas, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : SH 602
Collector : Dennis Sargant (plants collected by Alfred Bernhard Lau)
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Arrieros , between Guaymas and Hermosillo 50m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Rathbunia sonorensis, Marshallocereus thurberi
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http://www.mammillarias.net
Field number : SH 606
Collector : Dennis Sargant (plants collected by Alfred Bernhard Lau)
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (North of Bahia Kino 100m) Google Maps * Geocode
Date : 17/05/1973
Notes :
together with Ferocactus emoryi, Carnegiea gigantea, Pachycereus pringlei
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http://www.mammillarias.net
Field number : IDD 0835
Collector : Igor D. Dráb
Species : Mammillaria sheldonii
Locality : Mexicó : Sinaloa (Topolobambo) Google Maps * Geocode
Date : 20/04/2002
Notes :
idd702 aj Peniocereus gregii
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http://www.mammillarias.net
Field number : IDD 2009
Collector : Igor D. Dráb
Species : Mammillaria insularis-sheldonii
Locality : Mexicó : Baja California (severne Guerrero Negro) Google Maps * Geocode
Date : 18/10/2018
Notes :
idd035/18 B262, 149 m n. m., km 49,6 c. č. 1, stĺpikovitá
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http://www.mammillarias.net
Field number : ML 742A
Collector : Michel Lacoste
Species : Mammillaria sheldonii
Locality : Fuerte Pithaya, Sonora, Mexicó 10m Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : ML 742B
Collector : Michel Lacoste
Species : Mammillaria sheldonii
Locality : Fuerte Pithaya, Sonora, Mexicó 10m Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : SB 545
Collector : Steven (Steve) Brack
Species : Mammillaria sheldonii
Locality : Mexicó : Sinaloa (Talamante) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : SB 546
Collector : Steven (Steve) Brack
Species : Mammillaria sheldonii
Locality : Mexicó : Sinaloa (Zapotitlan) Google Maps * Geocode
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 20
Collector : Wendell (Woody) Minnich
Species : Mammillaria sheldonii
Locality : Fuerte Pithaya, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 30
Collector : Wendell (Woody) Minnich
Species : Mammillaria sheldonii / swinglei
Locality : Esperanza, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 5580
Collector : Wendell (Woody) Minnich
Species : Mammillaria sheldonii
Locality : San Carlos, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 8280
Collector : Wendell (Woody) Minnich
Species : Mammillaria sheldonii
Locality : San Bernardo, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : WM 8370
Collector : Wendell (Woody) Minnich
Species : Mammillaria sheldonii
Locality : El Peón, Sonora, Mexicó Google Maps
Date :
Notes :
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http://www.mammillarias.net
Field number : REP 220
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (peninsula Moritaguaymas, 5m) Google Maps * Geocode
Date : 10/07/1967
Notes :
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http://www.mammillarias.net
Field number : REPP 220
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (peninsula Moritaguaymas, 5m) Google Maps * Geocode
Date : 10/07/1967
Notes :
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http://www.mammillarias.net
Field number : REPP 221
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Guaymas, 60m) Google Maps * Geocode
Date : 10/07/1967
Notes :
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http://www.mammillarias.net
Field number : REP 221
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Guaymas, 60m) Google Maps * Geocode
Date : 10/07/1967
Notes :
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http://www.mammillarias.net
Field number : REPP 223
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Bahia Kino,) Google Maps * Geocode
Date : 12/07/1967
Notes :
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http://www.mammillarias.net
Field number : REP 223
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Bahia Kino,) Google Maps * Geocode
Date : 12/07/1967
Notes :
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http://www.mammillarias.net
Field number : REPP 570
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Cuidad Obregon, 70m) Google Maps * Geocode
Date : 04/10/1971
Notes :
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http://www.mammillarias.net
Field number : REP 570
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Cuidad Obregon, 70m) Google Maps * Geocode
Date : 04/10/1971
Notes :
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http://www.mammillarias.net
Field number : REPP 573
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Vicam, 100m) Google Maps * Geocode
Date : 06/10/1971
Notes :
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http://www.mammillarias.net
Field number : REP 573
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Vicam, 100m) Google Maps * Geocode
Date : 06/10/1971
Notes :
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http://www.mammillarias.net
Field number : REP 2105
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (South of Obregon, 90m) Google Maps * Geocode
Date : 03/04/1985
Notes :
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http://www.mammillarias.net
Field number : REPP 2105
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (South of Obregon, 90m) Google Maps * Geocode
Date : 03/04/1985
Notes :
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http://www.mammillarias.net
Field number : REPP 2116
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (El Peon, 60m) Google Maps * Geocode
Date : 06/04/1985
Notes :
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http://www.mammillarias.net
Field number : REP 2116
Collector : Werner Reppenhagen
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (El Peon, 60m) Google Maps * Geocode
Date : 06/04/1985
Notes :
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http://www.mammillarias.net
Field number : WK 71
Collector : Wolfgang Krueger
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (Alamos) Google Maps * Geocode
Date : 1988
Notes :
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http://www.mammillarias.net
Field number : WK 443
Collector : Wolfgang Krueger
Species : Mammillaria sheldonii
Locality : Mexicó : Sonora (km51 of MEX-15 , Vicam) Google Maps * Geocode
Date : 1996
Notes :
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http://www.mammillarias.net
Field number : WTH 683
Collector : Wolter ten Hoeve
Species : Mammillaria sheldonii
Locality : In the flat area along the road to Guásimas, Sonora, Mexicó Google Maps
Date : 2006
Notes :
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http://www.mammillarias.net