Lachnagrostis is a genus with 20-30 species, all originally native in the southern hemisphere. Its center of diversity obviously lies in Australasia (mainly New Zealand where many endemic species occur; Edgar 1995). Some additional species, of uncertain relationship, originate in South America, Malaysia and South Africa. Lachnagrostis is a segregate of Agrostis and its generic status has become widely accepted (e.g. Harvey 2007, Mabberley 2008, Jacobs & Brown 2009). Both genera are told apart on rather subtle characters of lemma epidermis (a discernible pattern of low relief in Lachnagrostis vs. a well-developed raised pattern in Agrostis). Lachnagrostis usually also has a well-developed rachilla extension, longer paleas and a panicle that easily detach at maturity. However, both genera have species that resemble one another in one of these features (Harvey 2007). Species of Lachnagrostis have not been included yet in recent molecular studies on Agrostis and related genera (compare with Quintanar & al. 2007).
At least one species, Lachnagrostis filiformis, is fairly weedy and now widely occurs beyond its original distribution range. It has repeatedly been recorded in Belgium as well.
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