Xerophyte

Description

Pterocactus valentiniSN|19631]]SN|19631]]i is a geophyte cactus, little branched from the base and cespitose. It is very polymorphous. Some plants has flattened spines remembering those of the genus Toumeya.

Roots

Tuberous or subtuberous, but rather small, 2-4 cm long.

Flowers

Not seen

Crested Growth

The crested form (Pterocactus valentiniSN|19631]]SN|19631]] f. cristata) - despite to its beauty - is very rare and sought after by collectors. It is a strong growing cactus with intricately undulating fan-shaped branches forming a snaky ridge or crowded cluster.

Spines

Inconspicuous all hyaline, yellow to nearly black,somewhat fattened and retroversely plicate.

Stem

Thin, fleshy, glabrous, fan shaped with indistinct wavy ribs (not winged), brownish-purple.

Fruits

Not seen

Areoles

Without wool