Description: Mammillaria karwinskiana subs. nejapensis (Mammillaria nejapensis) is very variable, especially for the length of the spines, and at the beginning there were two recognized varieties: var. brevispina (short spined form) and var. longispina (long spined form), with respectively short and long spines, but they are merely local or individual variations. This species branches basally or more frequently forms large colonies by dichotomous division.<br>Stem: Globose to short cylindrical, somewhat wider in the upper part, blue-green to dark green, to 15 cm high and 5 - 7.5 in diameter, with latex. A cream coloured 'snowy' tomentum is present on the top of the plant.<br>Tubercles: Tubercles firm, pyramidal with the lacteal juice, arranged spirally with 13-21 parastichys the axil is very woolly with many tortuous bristles.<br>Radial spines: Only 3 - 5, awl-like, straight to slightly curved, ivory with reddish-brown tips, becoming chalky white with age, the upper shorter, 2 - 5 mm long, the lowermost the longest, to 25 or even 50 mm (or more) long.<br>Central spines: Absent.<br>Flowers: Diurnal, funnel-form, 18 mm long, 10 mm in diameter, pale cream with red-brown to scarlet midstripe on each petal. Blooms adorn the crown of the plant, usually in a ring, in the growth of the previous year.<br>Blooming seson: Spring to summer.<br>Fruits: Bright or clear red elongated and quite attractive.<br>Seeds: Brown.
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