Tanacetum bipinnatum |
|
---|---|
camphor tansy, dune tansy, eastern tansy, floccose tansy, Lake Huron tansy, tanaisie bipennée |
|
Habit | 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). |
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. |
Heads | (2–)5–12(–20+) in corymbiform arrays or borne singly. |
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. |
Tanacetum bipinnatum |
|
Phenology | Flowering May–Sep. |
Habitat | Dunes, other sandy sites, calcareous soils, coastal scrub |
Elevation | 0–200+ m (0–700+ ft) |
Distribution |
AK; CA; ME; MI; OR; WA; WI; AB; BC; MB; NB; NF; ON; QC; SK; YT; 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. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 490. |
Parent taxa | Asteraceae > tribe Anthemideae > Tanacetum |
Sibling taxa | |
Synonyms | Chrysanthemum bipinnatum, Chrysanthemum bipinnatum subsp. huronense, T. bipinnatum subsp. huronense, T. camphoratum, T. douglasii, T. huronense, T. huronense var. bifarium, T. huronense var. floccosum, T. huronense var. johannense, T. huronense var. terrae-novae |
Name authority | (Linnaeus) Schultz-Bipontinus: Tanaceteen, 48. (1844) |
Web links |
|