Mammillaria albiarmata Description: Mammillaria coahuilensis subs. albiarmata best known as Mammillaria albiarmata is one of the local form of Mammillaria coahuilensis. It distinguishes from the type species for its more numerous spines.
Habit: It is a small solitary, geophyte cactus, with a heavy tap root that may exceed the size of the plant above soil level.
Stems: Flattened globose, strongly tuberculate basally, blue-green, up to 5 cm high and in diameter.
Tubercles: 3-angled in cross section. Axils moderately woolly. Without latex.
Spines: About 20-25, up to 6 mm long. thin, bristle-like radial spines, slightly pubescent white or creamy white with darker orange-pink tips, becoming yellowish brown.
Central spine: Not present.
Flowers: Broadly funnelform, up to 20 mm broad, creamy-white with pinkish midveins
Blooming season: Late winter to early spring (February/March)
Fruits: Red clavate.
Seed: Dark brown, distinctly pitted.
Cultivation and Propagation: This species has few special demand and whatever view one adopts it is worth a place in every Mammillaria collection.
Be careful with watering, which all thick rooted species require (rot sensitive), and patience to match its slow growth. During the winter rest, the plant may pull near the surface of the potting mix
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