Xerophyte

Central Spines

4, 15-80 mm long, ochre to greyish, straight or slightly curved, acicular.

Tubercles

Conical , basally rhomboid 8-17 mm long.

Flowers

30-45 mm wide, yellow. Anthers and stigma yellow

Blooming Season

Spring.

Taxonomic

Panarottoanus is the same. It has priority over flavus at species rank, bur at subspecies rank flavus is the correct epithet to be used.

Ribs

Completely divided into tubercles arranged in 8 and 13 spirals,

Stem

Globose, single heads 5-12 cm wide, olive green to purplish

Radial Spines

3-5, 7-35 mm long, ochre to greyish, straight, acicular.

Areoles

With glands.