Phemeranthus spinescens is a North American perennial plant in the Montiaceae family, with the common name spiny fameflower.

[1] Phemeranthus spinescens is a small ground-hugging plant with succulent sausage-shaped leaves up to 2.5 cm long, growing in tight clusters at the ends of multiple crown branches.

When the leaves wither the central leaf mid-rib often remains to form a short spine, from which the species name spinescens.

The magenta flowers with yellow anthers are 2 to 3 cm in width and form on a branched raceme.

It is typically found in dry very rocky soil with sparse vegetation.