Mammillaria duwei is a member of the genus Mammillaria

Mammillaria

The genus Mammillaria is one of the largest in the cactus family , with currently 171 known species and varieties recognized. Most of the mammillarias are native to Mexico, but some come from the southwest USA, the Caribbean, Colombia, Venezuela, Guatemala and Honduras.The first was described by...

 in the family Cactaceae. Mammillaria duwei is cactus endemic to Mexico

Mexico

The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

. Plants have dark green skin almost completely obscured by delicate white spines. Flowers are yellow and appear at the onset of Summer. Many specimens will cluster over time while others will remain solitary.

Distribution

Mammillaria duwei is native to Mexico ranging from Guanajuato

Guanajuato

Guanajuato officially Estado Libre y Soberano de Guanajuato is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided in 46 municipalities and its capital city is Guanajuato....

 and Queretaro

Querétaro

Querétaro officially Estado Libre y Soberano de Querétaro de Arteaga is one of the 31 states which, with the Federal District, comprise the 32 Federal Entities of Mexico. It is divided into 18 municipalities and its capital city is Santiago de Querétaro....

.

Conservation status

Mammillaria duwei is currently classified as Endangered due to the destruction of its habitat according the IUCN Red List of Threatened Species