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"
glabrate +  and sparsely tomentose +
not tailed +  and obtuse +
unequal +
scarious +
corymbiform +, compound +  and simple +
indeterminate +  and determinate +
Debra K. Trock +
Linnaeus +
decurrent +
compound +  and simple +
0.3 cm3 mm <br />0.003 m <br /> (1 cm10 mm <br />0.01 m <br />) +
linear;narrowly lanceolate +
3mm;5mm +
Sneezeweed +, sneezewort +, achillée ptarmique +  and herbe-à-éternuer +
zygomorphic +, actinomorphic +  and (3-)5-merous +
grayish white +  and white +
3 cm30 mm <br />0.03 m <br /> (?) +
winged +  and monomorphic +
oblong +  and obovate +
fertile +  and bisexual +
fertile +  and bisexual +
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 +
tomentose +, hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Roadsides, disturbed sites, open fields and pastures, in sandy or gravelly soils or in moist to drying silty soils +
in subcapitate clusters +  and singly +
indeterminate +
heterogamous +  and homogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
campanulate;hemispheric +
suborbiculate +
cauline +  and basal +
deltate +
entire +  and dentate +
unequal +
2-carpellate +
oblanceolate +
0.3 cm3 mm <br />0.003 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
membranous +
persistent +
Flowering late Jun–mid Sep. +
25 +  and 30 +
subequal +  and unequal +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
Introduced +
appendaged +  and truncate +
papillate +
Compositae +
Achillea ptarmica +
Achillea +
species +
campanulate +
flattened +
30 cm300 mm <br />0.3 m <br /> (60 cm600 mm <br />0.6 m <br />) +
shrub +  and subshrub +