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Sclerocactus johnsonii (Parry ex Engelm.) N.P. Taylor  
Family: Cactaceae
Eight-Spine Fish-Hook Cactus, more...Johnson's little barrel cactus, pygmy barrel cactus, Johnson barrel cactus, Johnson's fishhook cactus
[Echinocactus johnsonii Parry ex Engelm., moreEchinocactus johnsonii subsp. lutescens (Parish) A.E.Murray, Echinocactus johnsonii var. lutescens Parish, Echinomastus johnsonii (Parry ex Engelm.) E.M. Baxter, Echinomastus johnsonii subsp. johnsonii , Echinomastus johnsonii var. johnsonii , Echinomastus johnsonii var. lutescens (Parish) Wiggins in Shreve & Wiggins, Ferocactus johnsonii (Parry ex Engelm.) Britton & Rose, Neolloydia johnsonii var. lutescens (Parish) W.T. Marsh. ex R.G. Engard, Pediocactus johnsonii (Parry ex Engelm.) Halda]
Sclerocactus johnsonii image
Tony Frates
  • FNA
  • General Description
  • Resources
Allan D. Zimmerman & Bruce D. Parfitt in Flora of North America (vol. 4)
Stems 10-25 × 7-15 cm; ribs (13-)18-21; areoles (14-)21-26 mm apart along ribs; areolar glands present at least seasonally. Spines 13-24 per areole, pale yellow to grayish lavender to maroon; radial spines 9-16 per areole; abaxial (shortest) radial spine 6-19 × (0.2-)0.4-0.6 mm; adaxial and lateral (longest) radial spines ca. 27-40 mm; central spines 4-9 per areole, present at all ages, 27-41 × (0.7-)1.1-1.4 mm; longest central spine straight to strongly decurved; abaxial central spine porrect, ca. 27-40 mm Flowers 4-6.5 × 4-7.7 cm; inner tepals yellow or pink to magenta, basal portions blotched with maroon , 2.5-3.7 × 1-1.8 cm; stigma lobes yellowish white to green. Fruits dehiscent only along single, longitudinal split, ± spheric, 17-18 mm. 2n = 22.

Flowering (Feb-)Mar-May; fruiting Apr-Jun. Mojave desert scrub and upper edge of Sonoran desert scrub, rocky slopes, gravelly hills; 500-1400 m; Ariz., Calif., Nev., Utah.

Echinomastus johnsonii varies geographically in both flower and spine color. The yellow-flowered plants have been named E. johnsonii var. lutescens. The pink-flowered plants occur in separate populations, as far as is known, to the north of the yellow-flowered plants, but the interface between the two forms is poorly understood.

Plant: Stems generally 1, 10-25 cm, 5-10 cm diam, ovoid to cylindric; ribs 17-21, prominent; tubercles distinct Leaves: spines yellow or pink to reddish, central 4-8, radial 9-10 Flowers: solitary, bisexual, sessile, ± radial, 5-8 cm diam, greenish yellow, pink, or magenta; ovary scaly; scaly Fruit: 7-15 mm, 3-5 mm diam, becoming dry, scaly; scales widely cordate, ciliate; Seed reniform, tubercled, black Misc: Granitic areas, creosote-bush scrub; 500-1200 m.; Apr-May
Sclerocactus johnsonii
Sclerocactus johnsonii image
Tony Frates
Sclerocactus johnsonii image
Bethany Lund
Sclerocactus johnsonii image
Bethany Lund
Sclerocactus johnsonii image
Bethany Lund
Sclerocactus johnsonii image
Teague Embrey
Sclerocactus johnsonii image
Teague Embrey
Sclerocactus johnsonii image
Teague Embrey
Sclerocactus johnsonii image
Liz Makings
Sclerocactus johnsonii image
Liz Makings
Sclerocactus johnsonii image
Liz Makings
Sclerocactus johnsonii image
Liz Makings
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12 Total Images
The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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