Mammillaria elongata

''Mammillaria elongata'' is a species of flowering plant in the Cactaceae family, native to central Mexico. Growing to 15 cm tall by 30 cm wide, it consists of densely packed clusters of elongated oval stems, covered in harmless yellow or brown spines, and in spring producing white or yellow flowers. It is among the commonest and most variable of its genus in nature, and is a popular subject for cultivation.
It has gained the Royal Horticultural Society's Award of Garden Merit.