| Summary: | Noccaea Moench (1802: 89) is a large genus the vast majority of its species were originally described in Thlaspi Linnaeus (1753: 645). Meyer (1973) divided the latter genus into 12 segregates, including Noccaea, to which he placed 67 Eurasian and NW African species in four sections (Meyer: 2006). Experts on the Brassicaceae differ in the delimitation of Noccaea and some (e.g., Al-Shehbaz: 2014; Firat et al.: 2014; Güzel et al.: 2018; Özgişi et al.: 2018a, 2018b; Özüdoğru: 2018; Özüdoğru et al.: 2019; Özgişi: 2020a, 2020b) broadly delimit the genus to include most of Meyer’s dozen segregates and accept some 136 species, including the more recent novelties and nomenclatural adjustments by Bartolucii, Galasso & Peruzzi in Peruzzi et al. (2015), German (2016: 2017, 2018), Güzel et al. (2018), Özgişi et al. (2018b), and Özüdoğru et al. (2019). By contrast, a narrower generic concept for Noccaea was recognized in BrassiBase (https://brassibase.cos.uni-heidelberg.de/), Ali et al. (2016), and Karaismailoğlu & Erol (2018). As currently delimited, all except six species of Noccaea are Eurasian. Two species are endemic to the United States and one each in Algeria, Mexico, Patagonian South America, and Arctic Canada and Alaska (Al-Shehbaz: 2014).
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