G2G3QT2Q Range Rank, Questionable taxonomy, Infraspecific Taxon - A numeric range rank is used to indicate uncertainty about the exact status of a taxon.
G2 Imperiled - Imperiled globally because of rarity or because of some factor(s) making it very vulnerable to extinction or elimination. Typically 6 to 20 occurrences or few remaining individuals (1,000 to 3,000) or acres (2,000 to 10,000) or linear miles (10 to 50).
G3 Vulnerable - Vulnerable globally either because very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extinction or elimination. Typically 21 to 100 occurrences or between 3,000 and 10,000 individuals.
The status of infraspecific taxa (subspecies or varieties) are indicated by a "T-rank" following the species' global rank. Rules for assigning T-ranks follow the same principles as the "G-rank"
The distinctiveness of this entity as a taxon at the current level is questionable for both the 'G-rank' and 'T-rank'
Stems forming small dense clusters, the individual stems mostly 1-2 cm thick and to 8 cm tall; tubercles on mature stems with upper surface grooved; spines about 30-90 per areole, typically white often brown at tip, fading to gray, slender and bristl...
Stems growing in clumps, or commonly branched to form small dense clusters, the individual stems mostly 1-2 cm thick and to 10 cm tall; tubercles on mature stems with upper surface grooved; spines slender, spreading to erect in any one areole, mostly...