Cact. 4: 4. 1923
Illustrator: John Myers
Phenology: Flowering Nov–Mar.
Habitat: Tamaulipan thorn scrub, plains and low hills, sandy, loamy, silty, or gravelly soils [rarely on shale]
Elevation: 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.
|Author||Allan D. Zimmerman + and Bruce D. Parfitt +|
|Authority||(Salm-Dyck) Britton & Rose +|
|Basionyms||Echinocactus scheeri +|
|Common name||Root cactus +|
|Distribution||Tex. +, Mexico (Nuevo León + and Tamaulipas). +|
|Elevation||20-500 m +|
|Habitat||Tamaulipan thorn scrub, plains and low hills, sandy, loamy, silty, or gravelly soils [rarely on shale] +|
|Illustrator||John Myers +|
|Phenology||Flowering Nov–Mar. +|
|Publication title||Cact. +|
|Publication year||1923 +|
|Source xml||https://firstname.lastname@example.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V4/V4 392.xml +|
|Synonyms||Ancistrocactus megarhizus + and Sclerocactus scheeri +|
|Taxon family||Cactaceae +|
|Taxon name||Ancistrocactus scheeri +|
|Taxon parent||Ancistrocactus +|
|Taxon rank||species +|
|Volume||Volume 4 +|