Scleranthus

Scleranthus, the knawels, are a genus of herbaceous plants in the family Caryophyllaceae. It includes 12 species native to Europe, Siberia, western Asia, north Africa, Ethiopia, New Guinea, and Australia.

Species
12 species are accepted.
 * Scleranthus annuus L. – German-knotweed, knawel or annual knawel, native to Africa, Europe, Asia and naturalised elsewhere.
 * Scleranthus biflorus (J.R.Forst. & G.Forst.) Hook.f. – knawel, cushion-bush or two-flowered knawel, native to Australia and New Zealand
 * Scleranthus brockiei P.A.Will. – native to Australia and New Zealand
 * Scleranthus delortii Gren.
 * Scleranthus diander R.Br. – tufted knawel, native to Australia
 * Scleranthus fasciculatus (R.Br.) Hook.f. – native to Australia, introduced to New Zealand
 * Scleranthus × intermedius Kitt.
 * Scleranthus minusculus F.Muell. – native to Australia
 * Scleranthus perennis L. – perennial knawel
 * Scleranthus pungens R.Br. – native to Australia
 * Scleranthus singuliflorus (F.Muell.) Mattf. – one-flowered knawel, native to higher alpine areas in Australia
 * Scleranthus uncinatus Schur
 * Scleranthus uniflorus P.A.Will.