Tanacetum camphoratum

It was formerly known as Tanacetum douglasii,{{Cite book |last=Spellenberg |first=Richard |url=https://archive.org/details/nationalaudubons00spel/page/395/ |title=National Audubon Society Field Guide to North American Wildflowers: Western Region |publisher=Knopf |year=2001 |isbn=978-0-375-40233-3 |edition=rev |pages=400 |orig-date=1979}} now a synonym, and is often included in T. bipinnatum.[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=250067699 Flora of North America]

It is a rhizomatous, perennial herb growing up to {{Convert|60|cm}} tall. It has a thick, low-lying stem up to {{Convert|25|cm|abbr=on|frac=2}} long, branching to form a mass of vegetation. It is hairy, glandular, and aromatic, with a camphor scent. The leaves are up to 20 cm long and thick but featherlike, divided into many narrow leaflets on each side of the main rachis. Each leaflet in turn has many segments along each side, and the segments are usually divided into several small, knobby segments with folded or curled edges. Blooming from June to September, the inflorescence bears up to perhaps 20 flower heads, each about 1.5 cm wide. Each head contains many yellowish disc florets and many pistillate florets around the edges. The latter may have minute ray florets. The fruit is an achene a few millimeters long which is tipped with a small pappus of toothed scales.

It resembles the toxic T. vulgare (common tansy), which lacks the hairs and has up to 200 flower heads.

The species is native to the Pacific Coast of North America from British Columbia to northern California, where it grows on coastal sand dunes.

{{Reflist}}

• [http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?609,1904,1905 Jepson Manual Treatment]
• [http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Tanacetum+camphoratum Photo gallery]

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camphoratum

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