Botanical name: Mammillaria vetula    Family: Cactaceae (Cactus family)
Synonyms: Cactus vetulus, Mammillaria gracilis, Mammillaria regia

Thimble Cactus is a fleshy subshrub which forms clusters of spherical to short-cylindric, bluish-green stems with axils that may be naked or slightly woolly. Young plants have 25-40 radial spines, increasing to 50 as they mature, and they remain white. Central spines number 1 or 2, but can be more. These spines are reddish-brown and about 1 cm long. The flowers are funnel-shaped, lemon-yellow, approximately 1.5 cm in length and width, with white (sometimes orange-yellow) stigmas. The fruit is dull pink, and the seeds are black. Thimble Cactus is native to Mexico.

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The flower labeled Thimble Cactus is ...