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Petrorhagia
See list of 2 species in this genus-
1a. Inflorescence a dense, head-like cyme of (1–) 3–7 flowers at the stem summit; bracts brown-scarious, broad-ovate, ± enclosing the 10–13 mm long calyx
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1b. Inflorescence a solitary flower (rarely up to 3 flowers) at the tips of branches; bracts of inflorescence herbaceous, narrow-ovate, enclosing up to 50% of the 3–6 mm long calyx
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Each photo represents one species in this genus.