Siler Pincushion Cactus / Center For Plant Conservation
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Plant Profile

Siler Pincushion Cactus (Pediocactus sileri)

  • Global Rank: G2 - Imperiled
  • Legal Status: Federally Threatened
  • Family: Cactaceae
  • State: AZ, UT
  • Nature Serve ID: 132964
  • Lifeform: Subshrub
  • Categories of Interest: Cacti/Succulents
  • Date Inducted in National Collection: 10/30/2023

Pediocactus sileri is a small, solitary cactus, though it does occasionally form clusters. It is ball-shaped, but tends to elongate as it ages. It ranges in size from 4-18 inches tall and 3-4 inches in diameter. The spines at the center of the areole (the circular area from which a cluster of spines originate) are stout, approximately 1 inch long, and straight or slightly curved. They start out brown-black but turn pale gray or white with age. Surrounding the central spines are 11-16 thinner, shorter white spines. Flowers are yellow with maroon veins, about 2.5 cm in diameter. Flowering occurs in April to mid-May in Arizona and March to April in Utah. Fruits are greenish-yellow, somewhat enlarged upwards, with scales near the top. At maturity, fruit will be dry and split open, allowing seeds to spill out. Seeds are gray-black, 4.5 mm across (Arizona 2003).

Where is Siler Pincushion Cactus (Pediocactus sileri) located in the wild?

States & Provinces:

Siler Pincushion Cactus can be found in Arizona, Utah

Which CPC Partners conserve Siler Pincushion Cactus (Pediocactus sileri)?

CPC's Plant Sponsorship Program provides long term stewardship of rare plants in our National Collection. We are so grateful for all our donors who have made the Plant Sponsorship Program so successful. We are in the process of acknowledging all our wonderful plant sponsorship donors on our website. This is a work in progress and will be updated regularly.

Conservation Actions

Tina Stanley
  • 01/08/2024
  • Orthodox Seed Banking

Red Butte Garden has sent at least 1,200 wild-collected seeds of Pediocactus sileri to the USDA-ARS National Laboratory for Genetic Resources Preservation for long term storage.

Tina Stanley
  • 01/08/2024
  • Seed Collection Orthodox Seed Banking

Between 1993 and 2014, Red Butte Garden staff made 7 wild seed collections representing more than 3,300 seeds from 123 individuals of Pediocactus sileri. Over 2,000 of these seeds are held in long term storage at Red Butte Garden.

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Taxon Pediocactus sileri
Authority (Engelm.) L. Benson
Family Cactaceae
CPC Number 3137
ITIS 19775
Duration Perennial
Common Names Siler Pincushion Cactus
Associated Scientific Names Pediocactus sileri
State Rank
State State Rank
Arizona S2
Utah S1
Ecological Relationships

Common Name Name in Text Association Type Source InteractionID
Anthophorine bees Anthophora Suspected Pollinator Floral Link
Leaf-cutting bees Ashmeadiella Suspected Pollinator Floral Link
Bee flies Bee flies Floral Visitor Link
Syrphid flies Hover flies Floral Visitor Link

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