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Scleranthus perennis, the perennial knawel, [1] [2] is a perennial herbaceous plant in the family Caryophyllaceae. It grows on sandy, dry, acidic soils. It can grow up to 15 cm high and has white flowers of 2–5 mm. The plant used to be economically significant as the major host plant of the Polish cochineal. Closeup of flowers
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 ...
Scleranthus annuus subsp. aetnensis (Strobl) Pignatti – Sicily (Mount Etna) Scleranthus perennis subsp. stroblii (Rchb. ex Strobl) Giardina & Raimondo; Scleranthus perennis subsp. vulcanicus (Strobl) Bég. – Sicily (Mount Etna) Silene crassiuscula Brullo, C.Brullo, Cambria, Bacch., Giusso & Ilardi; Silene hicesiae Brullo & Signor.
The Polish cochineal lives on herbaceous plants growing in sandy and arid, infertile soils. Its primary host plant is the perennial knawel (Scleranthus perennis), but it has also been known to feed on plants of 20 other genera, including mouse-ear hawkweed (Hieracium pilosella), bladder campion (Silene inflata), velvet bent (Agrostis canina), Caragana, [4] smooth rupturewort (Herniaria glabra ...
Scleranthus perennis: Annual knawel Scleranthus annuus: Strapwort Corrigiola litoralis: Smooth rupturewort Herniaria glabra: Fringed rupturewort Herniaria ciliolata: Hairy rupturewort Herniaria hirsuta * Coral-necklace Illecebrum verticillatum: Four-leaved allseed Polycarpon tetraphyllum: Corn spurrey Spergula arvensis * Pearlwort spurrey ...
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Scleranthus annuus - common; Scleranthus perennis - rare; Silene nutans - common; Silene rupestris - rare; Silene tatarica - introduced, rare; Spergula arvensis - introduced, common; Spergula morisonii; Spergularia marina - rare; Spergularia rubra - common; Stellaria alsine; Stellaria crassifolia - rare; Stellaria graminea - common; Stellaria ...
Its primary host plant is the perennial knawel (Scleranthus perennis), but it has also been known to feed on plants of 20 other genera, including mouse-ear hawkweed (Hieracium pilosella), bladder campion (Silene vulgaris), velvet bent (Agrostis canina), Caragana, smooth rupturewort (Herniaria glabra), strawberry (Fragaria), and cinquefoil .