''Gastridium ventricosum'' is a species of

grass Poaceae () or Gramineae () is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns an ...

known by the common name nit-grass (British Isles) or nit grass (USA). This is an annual grass bearing a long, thin, smooth inflorescence of spikelets. It is native to Europe, North Africa, and southwestern Asia but has become naturalized in scattered locations elsewhere.Kew World Checklist of Selected Plant Families
/ref>Altervista Flora Italiana, Codino maggiore, Nit Grass, ''Gastridium ventricosum'' (Gouan) Schinz & Thell.
/ref>

References

Pooideae Grasses of Africa Grasses of Asia Grasses of Europe {{Pooideae-stub