A very odd plant with colourful flat spines and  tuberose pink roots.

What is this plant?
The first specimens of this rare and unusual cactus was sold as an improbable but stricking hybrid between a Toumeya papyracantha and Echinocereus knippelianus.

However the plant is presumably a cross between a Mammillaria sp. with an unknown cactus or perhaps a monstrous form of Mammillaria. 

Description: Clustering matforming.
Stem: 4 to 5cm wide, up to 4 cm tall, flattened and soft.
Ribs: Vertical formed by a row of elongated tubercles.
Central spines: Bright orange and yellow, flexible with a bent tip, but not hooked.They are also flat and not pungent.
Radial spines: Glassy white, bristly.
Roots: Tuberose, very juicy and pink.
Flowers: Pink in a ring around the crown.

Flowers.

Buds.

PS: Any additional information about the story and origin of this plant will be very appreciated...

Photo of conspecific taxa, varieties, forms and cultivars of Lobivia (Echinopsis) pentlandii : 

• Toumeya papyracantha
• Toumeya papyracantha cv. CURLY SPINES
• Toumeya papyracantha x Echinocereus knippelianus hybrid  ( ? )
   

Origin:  Garden origin (Nursery produced cultivar)
 

The tubercles are characteristically disposed in vertical rib/like lines.

Central spines bright orange and yellow, flexible with a bent tip, but not hooked. They are also flat a very uncommon feature for a Mammillaria. Radials bristly and white.