usually unbranched or slowly clustering,
deep-seated in substrate and inconspicuous.
Stems: Depressed-spheric to short cylindric, 1-3.5cm wide ×
1,5-7 cm tall. axils bare.
Roots: Diffuse not enlarged.
Spines: 40-80 per areole, in several series but all equally thin,
mostly appressed, white or very pale pink, often minutely tipped pinkish
brown, innocuous, bristlelike, 0,5-6 mm, glabrous to plumose, all
interpreted as radial, innermost spines shortest; No central spines.
Flowers: 1-2,5 cm; white or cream, usually with sharply defined
midstripes of green, yellow, tan, pink, pale purple, or reddish,
blooming from January to March
Fruits: Scarlet, cylindric or clavate, 10-25 mm long with floral
remnant persistent ripening in June August.
Notes: Adults of Mammillaria
lasiacantha usually have glabrous spines, but in some
populations all plants may retain plumose spines at maturity.