3-4″ round stems form large clusters. Circular clusters of deep pink flowers are borne on the upper surface in spring and summer. Hooked spines, downy white hairs.
Usually solitary, some clumps; to 10″h.; woolly between short central spines
Slow to form large clusters. Variable spines. Lots of bright pink flowers.
4″. Dense clusters of deep green globose stems. Wild spines, creamy flowers.
Long stems, 1″ diameter, clumping; tight star-shape spines. Small cream-colored flowers form a crown around the tips of the stems.
Large clumps of 3″d. x 7-8″ long stems.
Usually solitary, 4-6″
Small clumper, 4″ cylindrical; wooly between long spines; 4 subspecies
Small solitary green globular plant to 2″
Very cold hardy. Small ball cactus to 5″d.
Low dense clusters get covered with fine white hairs
Mini grey-green globular plant covered w/soft white spines. Readily clumping
Pronounced green tubercles. Usually solitary, to 6″d.
8″d. Clumping w/prominent tubercles, some axil wool
Generally forms clumps, to 2″d./6″h.; tubular red flowers
Medium sized solitary plants, pyramidal stems; long radial spines
Generally clumping, narrow stems to 6″ tall. Variable spination.
Usually solitary, globose to 6″. Variable spines. Carmine red flowers.
Solitary, cylindrical, to 4″d./6″h.; short twisted spines
Clusters of 4″ stems. Dark brown spines, yellow flowers
Slow branching; to 6″ cylindrical; woolly between spines
12″h. clumps develop as stems divide
Globular plants to 3″d. in dense clusters; covered in white feathery spines
Large clusters of small stems with cream colored flowers and bright red fruit.
Green stems to 6″, variable spines; generally solitary
Green stems to 6″, generally solitary. Purple flowers. Thin yellow-brown spines.
Slowly clumping, 4″ dia., 12″ tall
Occasionally branches; 4″d./12″h.; long curved yellow/brown spines. Blooms spring to fall with flowers that are a deep-pink to a purple color.
Small stems 2″ across x 4″ tall will form large clusters. Soft spines splay outwards. Creamy yellow flowers in summer and fall. Regular water in summer, keep dry in winter.
Clusters of 1-2″ stems