Tanacetum bipinnatum |
Tanacetum |
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dune tansy |
tansy |
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Habit | Plants 1.5–5+ dm. | Herbs perennial, usually aromatic; taprooted, usually rhizomatous. |
Stems | erect; simple to distally much branched, glabrous to villous or puberulent. |
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Leaves | oblanceolate or elliptic in outline, 3–35 × 2–10 cm; margins often curled, 2–3-times pinnately lobed; surfaces villous to woolly, sometimes glabrous; primary lobes in 6–24 pairs; secondary lobes linear to ovate or obovate. |
basal and cauline, alternate, bases often with lobed, fringed, or clasping auricles; margins entire to dentate, often 1–3-times pinnately lobed; surfaces glabrous, strigillose, floccose, or lightly to densely villous, abundantly punctate-glandular; basal often withered by flowering, sessile or petiolate. |
Inflorescences | clusters in panicle-like arrays. |
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Involucres | 4–5 × 8–22+ mm. |
campanulate or hemispheric. |
Receptacles | flat to rounded or conic, sometimes exceeding involucres in fruit; paleae 0. |
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Ray florets | 0–25; rays 1–6 mm, yellow. |
pistillate, sometimes vestigial or 0; rays ovate-elliptic; tips acute or truncate, sometimes 2–4-lobed. |
Disc florets | corollas 2–2.5 mm, yellow. |
numerous; bisexual; corollas tubular, linear or gradually widened distally, 4–5-lobed; lobes triangular; stamens included or slightly exserted; stigma lobes at tips of stamen tubes. |
Phyllaries | with membranous margins; inner not membranetipped. |
in 3–6 series; surfaces glabrous, villous, or minutely glandular; inner equal, linear-lanceolate to lanceolate or ovate; outer equal or gradually shorter, lanceolate; ovate or triangular; margins membranous or chartaceous; tips acute or obtuse. |
Fruits | 2–3 mm, tan; gland-dotted, 3–5-ribbed, pappi of low crowns or a ring of scales. |
obconic or columnar, glabrous or gland-dotted; veins 5–10+; pappi usually of low crowns, rarely of scales or 0. |
Heads | 2–20+; peduncles 0.3–12 cm, villous. |
usually radiate, sometimes disciform; peduncles glabrous to strigillose or villous. |
2n | =54. |
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Tanacetum bipinnatum |
Tanacetum |
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Distribution | ||
Discussion | Dunes, sandy flats, bluffs, grassy slopes. Flowering May–Aug. 0–100 m. Est. CA, WA; north to AK, northeast to Newfoundland; Asia, Europe. Native. Formerly treated as T. camphoratum, this taxon, as well as the related T. huronense, has been combined into T. bipinnatum. |
Asia, Europe, North Africa, North America. 160 species; 4 species treated in Flora. |
Source | Flora of Oregon, volume 2, page 360 Kenton Chambers |
Flora of Oregon, volume 2, page 360 Kenton Chambers |
Sibling taxa | ||
Subordinate taxa | ||
Synonyms | Tanacetum camphoratum, Tanacetum douglasii | |
Web links |
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