Weeds
Tanacetum vulgare L. - Common Tansy
Synonyms.
Chrysanthemum tanacetum Karasch.Systematic position.
Family Asteraceae, genus Tanacetum L.Biological group.
Perennial weed forming long rootstocks.Morphology and biology.
Rhizome long, horizontal, ligneous. Rhizomes promote vegetative reproduction and formation of thickets. Stem straight, simple, 50-150 cm in height, almost glabrous. Leaves generally elongate-ovoid, 7-20 cm in length and 3-10 cm in width, pinnatisect, with lanceolate lobes having sharply serrate, ovoid-lanceolate or lanceolate lobules; the latter are 3-10 mm in length and 1-5 mm in width. Main leafstalk covered with the same lobules between primary lobes. Lowermost leaves petiolate, other ones sessile, slightly hairy or glabrous, finely punctated on upper side. Calathidia numerous, semi-globular, almost flat from above, 7-12 mm in diameter, corymbose at top of stalk. External involucral leaflets ovoid-lanceolate, pointed; inner ones elongate-ovoid, blunt, brownish-membranous at apex and at margins. Flowers yellow. Hemicarps with short finely serrate margin, less often without it. Weight of 1,000 seeds is 0.093 g.Distribution.
Almost all Europe, Asia Minor, Mongolia, Northern China, Korea, Northern Japan; North America (introduced). It gradually invades other countries. On territory of the former USSR, the species is distributed over all the European part, the Caucasus, Central Asia, Western and Eastern Siberia, the Far East.Ecology.
The species grows on meadows, in thickets of bushes, along coast of reservoirs, frequently along roads and ditches, on glades and edges. It prefers sandy and loamy-sandy, frequent carbonate soils.Economic significance.
The weed frequently meets on field margins, fallow and abandoned lands, along boundaries, in crops, especially in perennial grasses. Control measures to Common Tansy should be directed toward exhaustion of rhizomes by deep plowing on fallow fields, inter-row treatment of tilled cultures, and chemical weeding if necessary.Reference citations:
Bakin, O.V., Rogova, T.V., Sitnikova, A.P. 2000. Vascular plants of Tatarstan. Kazan: Kazan University. 496 p. (in Russian).Gubanov, I.A., Kiseleva, K.V., Novikov, V.S., Tikhomirov, V.N. 2004. Illustrated keys to plants of Middle Russia. V. 3, Moscow: KMK, 520 p. (in Russian).
Maevskii, P.F. 1954. Flora of middle belt of the European part of the USSR. Moscow & Leningrad: Selkhozgiz. 912 p. (in Russian).
Shishkin, B.K., ed. 1965. Flora of the Leningrad Region. V. 4. Leningrad: LGU. 356 p. (in Russian).
Vul.f E.V. 1969. Flora of Crimea. V. 2(2). Moscow: Selkhozhiz, 394 p. (in Russian).