Petrorhagia cyrenaica (Durand & Barratte) P.W.Ball & Heywood , it is an annual herb, up to 5-30 cm tall. glaucous-glabrous or nasally papillate scabrid. Leaves linear to setaceous, up to 20 mm long, ± membranous, connate-vaginate at the base, sharply acute. Flowers white, 1-3 in each cluster, outer bracts of involucre many, ovate-lanceolate largest 4-8 x 1.5-2.5 mm, shorter than and not enclosing the flowers or calyx, almost entirely white-scarious with brown-membranous nerves. Calyx ± turbinate, 4.5-6 mm long, whitish-membranous. sparsely eglandular pubescent to glabrous; teeth oblong, 2-2.5 mm long, ciliolate on margins, obtuse. Petals not distinctly clawed, linear-oblanceolate, 5.5-8 mm long, white, pale-red beneath, entire-rounded at the tip. Stamens 10, filaments filiform, glabrous, anthers oblong, c. 1 mm long, violaceous. Ovary ovoid, oblong, glabrous, with sub exserted styles. Capsule oblong, shorter than calyx. sessile. Seeds (immature) 1.3-1.5 x c. 1.1 mm. black.
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