Mammillaria thornberi Orcutt
  • W. Amer. Sci.
  • Thornber’s nipple cactus

Cite taxon page as 'WFO (2021): Mammillaria thornberi Orcutt. Published on the Internet; Accessed on: 17 Oct 2021'

General Information

Plants branching prolifically from base, every branch with independent root system, connections to rest of clone ephemeral, resulting in dense clumps of independently rooted stems. Roots diffuse, upper portion not enlarged. Stems slender cylindric, 4.5-10(-30) × 2-3.5 cm, tapered at base, firm; tubercles 5-9 × 5-9 mm; axils appearing naked; cortex and pith not mucilaginous; latex absent. Spines 14-22(-23) per areole, whitish to yellowish near base, pale reddish brown to nearly black toward tips, glabrous; radial spines 13-21 per areole, whitish, with reduced dark tips relative to central spines, bristlelike, 5-9 × 0.16 mm, stiff; central spines 1(-3) per areole, porrect, hooked, (7-)9-18 × 0.16-0.45 mm; subcentral spines 0(-3) per areole, adaxial to central spines, ± transitional to radial spines. Flowers 1.5-3 × 1.2-2.5 cm; outermost tepal margins densely short fringed; inner tepals white or pinkish with bright rose-pink midstripes, 14-19 × 5-7 mm; stigma lobes magenta, 3-6 mm. Fruits bright red, obovoid to nearly clavate, 7-15 × 4-7 mm, juicy only in fruit walls; floral remnant persistent. Seeds black, 0.9-1.1 × 0.8-1.1 × 0.7 mm, pitted; testa hard , brittle; anticlinal cell walls straight (not undulate); interstices conspicuously wider than pit diameters; pits bowl-shaped. 2n = 22.

  • Provided by: [B].Flora of North America @
    • Source: [
    • 1
    • ]. 

    Other Local Names

    Thornber’s nipple cactus

     Information From

    World Flora Online Data. 2017.
    • A CC0 1.0 Universal (CC0 1.0).
    Flora of North America @
    'Flora of North America @ eFloras (2008). Published on the Internet [accessed August 2016]' Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
    • B Flora of North America Association
    World Flora Online consortium
    World Flora Online Data. 2018.
    • C CC0 1.0 Universal (CC0 1.0).
    International Union for Conservation of Nature
    IUCN 2016. IUCN Red List of Threatened Species. Version 2016-2
    • D All Rights Reserved
    International Union for Conservation of Nature v.3
    IUCN 2019. The IUCN Red List of Threatened Species. Version 2019-1.
    • E See IUCN Terms and conditions of use