Achillea ptarmica

Linnaeus
Sp. Pl. 2: 898. 1753.
Common names: Sneezeweed sneezewort achillée ptarmique herbe-à-éternuer
Introduced
Treatment appears 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

V19-824-distribution-map.gif

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.

Selected References

None.

Lower Taxa

None.

... more about "Achillea ptarmica"
Debra K. Trock +
Linnaeus +
Sneezeweed +, sneezewort +, achillée ptarmique +  and herbe-à-éternuer +
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. +  and Eurasia. +
0–2400 m +
Roadsides, disturbed sites, open fields and pastures, in sandy or gravelly soils or in moist to drying silty soils +
Flowering late Jun–mid Sep. +
Introduced +
Compositae +
Achillea ptarmica +
Achillea +
species +