Tanacetum vulgare
Tanacetum bipinnatum
common tansy, tanaisie vulgaire, tansy
camphor tansy, dune tansy, eastern tansy, floccose tansy, Lake Huron tansy, tanaisie bipennée
1–2+ (ridged), erect, branched distally (glabrous or sparsely hairy).
(sometimes purple-tinged) 1–2+, ± decumbent to ascending or erect, branched.
basal (soon withering) and cauline; petiolate or sessile;
blades broadly oblong or oval to elliptic, 4–20 × 2–10 cm, pinnately lobed (rachises ± winged, primary lobes 4–10 pairs, lance-linear to lanceolate or narrowly elliptic, often pinnately lobed or toothed), ultimate margins dentate, faces glabrous or sparsely hairy, gland-dotted.
basal (soon withering) and cauline; petiolate (bases often clasping) or sessile;
blades ± ovate or elliptic to obovate or spatulate, mostly 7–25+ × 3–5(–10+) cm, 2–3-pinnately lobed (primary lobes mostly 6–24+ pairs, narrowly oblong to linear-elliptic or linear, lobules oblong or ovate to ± lanceolate, sometimes curled), ultimate margins entire or ± dentate, faces usually ± villous or arachno-villous to lanate, sometimes glabrescent or glabrate, usually gland-dotted (in pits).
5–10 mm diam.
8–22+ mm diam.
convex to conic, epaleate.
flat to hemispheric.
0 (heads disciform, peripheral pistillate florets ca. 20; corollas yellow, lobes 3–4).
8–21+ (pistillate, fertile; corollas pale yellow to yellow, laminae mostly 1–7+ mm, usually 3-lobed) or 0 (heads quasi-radiant or -radiate or ± disciform, peripheral pistillate florets 15–30+; corollas pale yellow, ± zygomorphic, lobes 3–5, abaxial more pronounced).
2–3 mm.
(2–)3(–4) mm.
20–200 in compact, corymbiform arrays.
(2–)5–12(–20+) in corymbiform arrays or borne singly.
1–2 mm, 4–5-angled or -ribbed, gland-dotted;
pappi coroniform, 0.2–0.4 mm.
2–3(–4) mm, weakly 5-ribbed or -angled, gland-dotted;
pappi coroniform, 0.1–0.5+ mm (entire or erose to lacerate).
= 18.
= 54.
Tanacetum vulgare
Tanacetum bipinnatum
Tanacetum vulgare escapes from and/or persists after cultivation. In the flora area, it is naturalized mostly in the northeastern and Pacific Coast states and provinces and sporadically elsewhere.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
The circumscription of Tanacetum bipinnatum adopted here includes not only T. huronense (see E. Hultén 1941–1950, vol. 10, 1968) but T. camphoratum and T. douglasii as well (see D. W. Kyhos and P. H. Raven 1982; C. J. Mickelson and H. H. Iltis 1966). Subspecies bipinnatum has been distinguished from subsp. huronense by having heads borne singly or 2–4 together versus (1–)3–12(–20+) in corymbiform arrays, phyllary margins dark brown versus pale brown, and laminae of ray corollas mostly 3–7 mm versus 1–3 mm. Relatively low plants, 10–20(–40 cm) from dune habitats along the southern shore of Lake Athabasca, Saskatchewan, with mostly 1–4, lanate cauline leaves and 1(–2) heads per flowering stem have been called T. huronense var. floccosum.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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WildflowerSearch
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- Local floras: BC, CA, OR, WA
- Local Web sites: CalFlora, CalPhotos, Flora NW, Go Botany, MI Flora, PNW Herbaria
- WildflowerSearch
- iNaturalist (observations)
- USDA Plants Database
- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
