Petrorhagia
Bracts at base of flower scarious, straw-coloured Petrorhagia
Stems glabrous or simple-hairy. Seeds 1.3–1.8 mm long, reticulate. Widespread. Weed in pastures and waste places. Introd. from the Mediterranean. Fl. spring–summer Petrorhagia nanteuilii
Stems glandular hairy. Flowers very shortly pedicellate. Seeds up to 1.3 mm long, papillose. Weed in pastures and waste places. Introd. from the Mediterranean. Fl. spring–summer Petrorhagia velutina