Artemisia sieversiana Ehrh. (N and C-As.) – An exceptional and ephemeral grain alien. Recorded by roadsides in the port area in Gent in 2011. Perhaps overlooked before.
Artemisia sieversiana is closely related with and very reminiscent of A. absinthium. It is an annual or biennial (vs. perennial) with larger heads (4-6 mm across, vs. 2-3 mm) and nutlets (1,2-2 mm long), leaves that are more or less triangular in outline with more acute leaf lobes and a deeply grooved, nearly angled stem. It is well-known for instance in the Czech Republic (Hejný 1964) and Ukrain (Mosyakin 1990).
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Selected literature:
Hejný S. (1964) Artemisia sieversiana Willd., eine neue eingeschleppte Art in der Tschechoslowakei. Preslia 36: 392-402.
Mosyakin S.L. (1990) New and noteworthy alien species of Artemisia L. (Asteraceae) in the Ukrainian SSR. Ukr. Botan. Zhurn. 47(4): 10-13.