Suleyman Demir notes:
C.compacta is very widespread so very variable. The type plant of C. palmeri was a central-spined form of C.compacta.
Solitary, globular stem,10 cm in diameter.
This species usually has no central spines, or one hooked, as the palmeri form which I displayed in here. Some plants has one central on only one or more areols.
In culture without problems, but not often flowering.
Original Description:The Cactaceae 4
p.39 - Britton & Rose (1920)
Plant-body globular; tubercles closely set in about 13 rows but not very regularly arranged, pale green, not very flaccid; radial spines 11 to 14, rather stout, spreading nearly at right angles to the central one, yellowish; tips often blackish; central spine one, stout, terete, hooked at apex; young areoles very woolly; flowers central, pale yellow to nearly white, about 3 cm long; outer perianth-segments linear-oblong, acute, brownish on broad mid-rib, entire, the inner yellow throughout, acuminate; stamens numerous; stigma lobes 9, linear, cream-colored.
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