Achillea ptarmica

Linnaeus

Sp. Pl.2: 898. 1753

Common names: Sneezeweed sneezewort achillée ptarmique herbe-à-éternuer
Found in FNA Volume 19. Treatment on page 494. Mentioned on page 493.
Perennials, 30–60+ cm (rhizomatous). Stems 1, erect, branched distally, proximally glabrate, distally villous or tomentose. Leaves sessile; blades linear to narrowly lanceolate, 3–10 × 3–5 mm, (bases slightly clasping, margins usually serrulate, rarely subentire), faces glabrous or sparsely hairy on midveins adaxially. Heads 3–15+, in simple or compound, corymbiform arrays. Phyllaries 25–30+ in ± 3 series, (light green, midribs yellowish, margins light brown) lanceolate to oblanceolate, faces tomentose. Receptacles flat to slightly convex; paleae oblanceolate, 3–4 mm. Ray florets 8–10(–13), styliferous and sterile (45–70, pistillate, fertile, in horticultural doubles); corollas white, laminae suborbiculate, 4–5 × 4–5 mm (5–7 × 3.5–4.5 mm in doubles). Disc florets 45–75+ (sometimes 0 in doubles); corollas grayish white, ca. 3 mm. Cypselae 1.5–2 mm. 2n = 18.

Phenology: Flowering late Jun–mid Sep.
Habitat: Roadsides, disturbed sites, open fields and pastures, in sandy or gravelly soils or in moist to drying silty soils
Elevation: 0–2400 m

Distribution

Introduced; Greenland, Alta., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Alaska, Colo., Conn., Idaho, Ind., Maine, Mass., Mich., Minn., Mo., Mont., N.H., N.J., N.Y., N.Dak., Ohio, Pa., R.I., Vt., Wash., W.Va., Wis., Eurasia.

Discussion

Achillea ptarmica is naturalized from Eurasia. “Double-flowered” plants originated as cultivars; apparently, they persist outside of cultivation.

References

None.

Facts about "Achillea ptarmica"
AuthorDebra K. Trock +
Common nameSneezeweed +, sneezewort +, achillée ptarmique + and herbe-à-éternuer +
Elevation0–2400 m +
HabitatRoadsides, disturbed sites, open fields and pastures, in sandy or gravelly soils or in moist to drying silty soils +
IllustratorLinny Heagy +
PhenologyFlowering late Jun–mid Sep. +
ReferenceNone +
Taxon nameAchillea ptarmica +
Taxon parentAchillea +
Taxon rankspecies +
VolumeVolume 19 +