Skip Navigation
Sign In
  • Home
  • Search
    • Search Collections
    • Map Search
  • Chicago Botanic Garden
    • Project Information
    • Checklists
    • Create a Checklist
    • Dynamic Key
  • Denver Botanic Gardens
    • Project Information
    • Checklists
    • Create a Checklist
    • Dynamic Key
  • Desert Botanical Garden
    • Project Information
    • Checklists
    • Create a Checklist
    • Dynamic Key
  • NY Botanical Garden
    • Project Information
    • Checklists
    • Create a Checklist
    • Dynamic Key
  • Marie Selby Botanical Gardens
    • Project Information
    • Checklists
    • Create a Checklist
    • Dynamic Key
  • Sitemap

Ancistrocactus scheeri

Ancistrocactus scheeri (Salm-Dyck) Britton & Rose  
Family: Cactaceae
Scheer's Cat-Claw Cactus
Ancistrocactus scheeri image
  • FNA
  • Resources
Allan D. Zimmerman & Bruce D. Parfitt in Flora of North America (vol. 4)
Plants unbranched (unless injured) until very old age, then few branched from ground level, precociously conspicuous. Roots long, fleshy, tuberlike taproots with bulbous swellings, sometimes having bulbous secondary roots, frequently horizontally oriented. Stem cylindric to club-shaped and stipitate, or spheric, to 17 × 8 cm. Spines: radial spines 13-28 per areole, translucent yellowish, tips red-brown, longest spines 6-28 × 0.15-0.55 mm; central spines 3-4 per areole; abaxial central spine 1 per areole, hooked (very rarely straight), ± terete or adaxially flattened, generally whitish or light brown, sometimes adaxially dark striped with brown to black, 12-38 mm; adaxial central spines (2-)3 per areole, erect, straight, dorsiventrally compressed, abaxially tan to whitish, adaxially brown to dark reddish brown, 19-50 mm. Flowers: inner tepals consistently bright green to yellowish (rarely pink to pale reddish). Fruits 19-35 mm. 2n = 22.

Flowering Nov-Mar. Tamaulipan thorn scrub, plains and low hills, sandy, loamy, silty, or gravelly soils [rarely on shale]; 20-500 m; Tex.; Mexico (Nuevo León, Tamaulipas).

The roots of Ancistrocactus scheeri are diagnostic at all ages; frequently they are horizontally oriented, sausage-shaped or otherwise strongly tuberlike, but always separated from the stem by a fragile constriction, in contrast to the short, succulent, vertical taproots of A. brevihamatus. When separated from the tuberlike roots, stems of A. scheeri in horticulture will develop their peculiar succulent root systems, even in the artificial environment of a container.

Seedlings and immature plants of A. scheeri often have narrowly cylindric stems and numerous tightly appressed, pectinately arranged, short radial spines. With age, the stems broaden distally and new spines are longer, coarser, and less tightly appressed.

Adult plants of Ancistrocactus scheeri and A. brevihamatus are relatively similar above ground. The stems of immature A. brevihamatus, however, are not obscured by spines and are often flush with the soil surface, whereas those of A. scheeri are nearly hidden by spines and fully exposed above the soil.

Ribs on the stems of Ancistrocactus scheeri seem straighter and better defined than ribs of A. brevihamatus, even prior to sexual maturity.

Ancistrocactus scheeri
Open Interactive Map
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Ancistrocactus scheeri image
Click to Display
32 Total Media
Institute for Museum and Library Services KU BI Logo Logo for the Biodiversity Knowledge Integration Center

This project was made possible in part by the Institute of Museum and Library Services [MG-70-19-0057-19].

EcoFlora is part of the SEINet Portal Network. Learn more here.

Powered by Symbiota.