First records of Mentha cervina (hart’s pennyroyal) in Britain

Baker, A. 2020. Mentha cervina (Lamiaceae), an emergent aquatic alien species naturalising at South Gare, North-East Yorkshire. Vol. 2 No. 1 British & Irish Botany.

https://britishandirishbotany.org/index.php/bib/article/view/37

Mentha cervina in bloom

Published and open access since Feb 26 2020.

Abstract: There is an increasing interest in recording early colonisation of organisms when studying changes in distribution ranges induced by climate change. Here, I describe one population of Mentha cervina L. (Hart’s pennyroyal), naturalising in the wild at South Gare, v.c.62 North-east Yorkshire. Two other populations have been reported in Britain and none are known from Ireland. Of the three populations ever reported from the wild in Britain, two are still extant. It is unclear what vectors disperse M. cervina in Britain and whether the species is becoming increasingly naturalised or not. Diagnostic characters: digitate bracteoles and four calyx teeth, are provided to facilitate the recording of this mint species by field botanists.

Mentha cervina, growing in situ in South Gare