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Taxonomy. The genus Cyclospermum, earlier in Apium, is distinguished by more elongated cotyledons, subrhomboidal pollen grains (oval in Apium s.str.) and a chromosome base-number of x=7 (x=11 in Apium); it was first published as Ciclospermum (Cerceau-Larrival 1964). When the original type species C. ammi (L.) Lag. proved to belong to Trachyspermum, the genus was proposed for conservation with the new type species C. leptophyllum (Burtt 1989); upon conservation the spelling was altered to Cyclospermum (Nicolson 1993).
Cyclospermum leptophyllum (Pers.) Eichler 1986 ( Apium leptophyllum (Pers.) F. Muell. 1864; Apium ammi (Savi) Urban 1879 (not based on Sison ammi L. 1753); Apium tenuifolium auct. non (Moench) Thell. 1926). F amerikanselleri. N mølleselleri. S kvarnselleri. – Lit.: Suominen (1979). – Medium-sized annual. Leaves 2–3-pinnatifid, with linear lobes (the lowest leaves sometimes with broader lobes). Umbels sessile or shortly pedunculate, without bracts. Umbellules 2–4, with rays longer than the peduncle and without bractlets. Flowers 6–18 per umbellule; petals white; anthers red, c. 0.1 mm. Fruit as in Apium graveolens, but ridges slightly higher in cross section. –[2n=14]
Brought in with cereals and oilseed. N Ak Oslo 1967 (mill); also recorded from Bu Hurum 1999 (loading place), VA Kristiansand 1967, Ro Stavanger 1988 and ST Skaun 1930 (all mills), but no vouchers seen. S Sk Malmö 1906, 1920, Kristianstad 1924 (mill), BhG Göteborg several records 1924–35, Angered several records 1935–46 (mill), Mölndal 1936, 1937 (with oilseed), Uddevalla 1943 (with oilseed), Srm Nacka 1904, 1932 (mill dump). F U Helsinki 1934 (earth-filling). – Specimens from F EH Nokia 1966 and Tampere 1968–69 were probably mislabelled.. – South America, reaching S North America; introduced in Europe as well as other parts of the world. - Map (not in the book). |