SafePlants

Astrophytum myriostigma: The Bishop's Cap Cactus

Astrophytum myriostigma, commonly known as Bishop's Cap Cactus, Bishop's Hat, or Bishop's Miter Cactus, is a popular and distinctive cactus species. Its unique shape and speckled appearance make it a favorite among plant enthusiasts.

Considerations for Pets

• This cactus has prominent ribs, which could pose a risk of skin puncture if interacted with.

Scientific Classification

• Scientific Name: Astrophytum myriostigma Lem.
• Family: Cactaceae
• Subfamily: Cactoideae
• Tribe: Cacteae
• Synonyms:
  • Astrophytum columnare
  • Astrophytum tulense
  • Astrophytum prismaticum
  • Astrophytum coahuilense
  • Echinocactus myriostigma

Distribution and Habitat

• Astrophytum myriostigma is native to the highlands of northeastern and central Mexico.
• It is found in the states of Coahuila, Nuevo Leon, and San Luis Potosi.

Morphology and Growth

• The plant is globe-shaped and often described as resembling a bishop's hat.
• It is a star-shaped, spineless cactus with typically 3 to 8 prominent ribs.
• Collectors often seek individuals with four or six ribs.

Varieties and Forms

• Astrophytum myriostigma var. nudum: This form lacks the characteristic white tufts, resulting in a smooth green appearance.
• Astrophytum myriostigma "quadricostatum": This form has four ribs. A "nudum" variation of this also exists which has a glabrous stem lacking the white tufts of loose hairy scales typical of the species.

Quirky Facts

• The name Astrophytum comes from the Greek word for "star plant," referring to the plant's shape.
• The species epithet myriostigma refers to the plant's epidermis covered in countless specks.

Conservation Status

• Astrophytum myriostigma is listed as Least Concern due to its wide distribution and abundance. However, there are a number of threats that are causing concern for its population.