Lallemantia Fisch. et C.A. Mey.
Lallemantia is a genus of five species, all native to Asia. A few species are sometimes cultivated as ornamentals (e.g. Jäger & al. 2008) and one, Lallemantia iberica, is a local weed of arable land and sometimes occurs as an alien outside its native distribution range.
Lallemantia is closely related with (and formerly included in) Dracocephalum. In Lallemantia stamens are concealed by two longitudinal flaps in the corolla tube. However, some molecular data suggest it may better be placed in Dracocephalum (Drew & Sytsma 2012). Lallemantia is also close to our native genera Glechoma and Nepeta.
Literature:
Drew B.T. & Sytsma K.J. (2012) Phylogenetics, biogeography, and staminal evolution in the tribe Mentheae (Lamiaceae). Am. J. Bot. 99(5): 933-953. [available online at: http://www.amjbot.org/content/99/5/933.long?cited-by=yes&legid=amjbot;99/5/933&related-urls=yes&legid=amjbot;99/5/933]
Gorshkova S.G. (1977) Lallemantia. In: Shishkin B.K. (ed.), Flora of the U.S.S.R., vol. XX. Academy of Sciences of the USSR: 324-328.
Jäger E.J., Ebel F., Hanelt P. & Müller G. (eds.) (2008) Rothmaler Band 5. Exkursionsflora von Deutschland. Krautige Zier- und Nutzpflanzen. Springer Verlag, Berlin: 880 p.
Rechinger K.H. (1982) Lallemantia. In: Rechinger K.H. (ed.), Flora Iranica 150. Akademische Druck- und Verlagsanstalt, Graz: 232-239.
Rich T.C.G. & Sydes C. (2001) Typification of Linnaean plant names in Lamiaceae (Labiatae). Taxon 50: 507-523.
Schnedler W. (1977) Pflanzen, von denen in der mitteleuropaischen Literatur selten oder gar keine Abbildungen zu finden sind: Folge III. Gött. Flor. Rundbr. 11(3): 50-57.
Schnedler W. (1979) Pflanzen, von denen in der Mitteleuropäischen Literatur selten oder gar keine Abbildungen zu finden sind. Folge IX. Noch einmal zur Gattung Lallemantia Fisch. et Mey. Gött. Flor. Rundbr. 13: 15-17.