Tanacetum bipinnatum

(Linnaeus) Schultz-Bipontinus
Tanaceteen, 48. 1844.
Common names: Tanaisie bipennée
Basionym: Chrysanthemum bipinnatum Linnaeus Sp. Pl. 2: 890. 1753
Synonyms: Chrysanthemum bipinnatum subsp. huronense (Nuttall) Hultén Tanacetum bipinnatum subsp. huronense (Nuttall) Breitung Tanacetum camphoratum Nuttall Tanacetum douglasii Tanacetum huronense Tanacetum huronense var. bifarium Fernald Tanacetum huronense var. floccosum Raup Tanacetum huronense var. johannense Fernald Tanacetum huronense var. terrae-novae Fernald
Treatment appears in FNA Volume 19. Treatment on page 490. Mentioned on page 489, 491.

Perennials, 5–30(–80) cm. Stems (sometimes purple-tinged) 1–2+, ± decumbent to ascending or erect, branched. Leaves 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). Heads (2–)5–12(–20+) in corymbiform arrays or borne singly. Involucres 8–22+ mm diam. Receptacles flat to hemispheric. Ray florets 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). Disc corollas (2–)3(–4) mm. Cypselae 2–3(–4) mm, weakly 5-ribbed or -angled, gland-dotted; pappi coroniform, 0.1–0.5+ mm (entire or erose to lacerate). 2n = 54.


Phenology: Flowering May–Sep.
Habitat: Dunes, other sandy sites, calcareous soils, coastal scrub
Elevation: 0–200+ m

Distribution

V19-820-distribution-map.gif

Alta., B.C., Man., N.B., Nfld. and Labr. (Nfld.), Ont., Que., Sask., Yukon, Alaska, Calif., Maine, Mich., Oreg., Wash., Wis., Eurasia.

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Tanacetum bipinnatum"
Linda E. Watson +
(Linnaeus) Schultz-Bipontinus +
Chrysanthemum bipinnatum +
Tanaisie bipennée +
Alta. +, B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, Ont. +, Que. +, Sask. +, Yukon +, Alaska +, Calif. +, Maine +, Mich. +, Oreg. +, Wash. +, Wis. +  and Eurasia. +
0–200+ m +
Dunes, other sandy sites, calcareous soils, coastal scrub +
Flowering May–Sep. +
Tanaceteen, +
Chrysanthemum bipinnatum subsp. huronense +, Tanacetum bipinnatum subsp. huronense +, Tanacetum camphoratum +, Tanacetum douglasii +, Tanacetum huronense +, Tanacetum huronense var. bifarium +, Tanacetum huronense var. floccosum +, Tanacetum huronense var. johannense +  and Tanacetum huronense var. terrae-novae +
Tanacetum bipinnatum +
Tanacetum +
species +