Achillea Linnaeus (Q2098)

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Achillea is a taxon with the rank genus within the subtribe Matricariinae
Language Label Description Also known as
English
Achillea Linnaeus
Achillea is a taxon with the rank genus within the subtribe Matricariinae

    Statements

    taxon/id/Achillea Linnaeus
    0 references
    Achillea Linnaeus
    Achillea
    Linnaeus
    FNA Editorial Committee. 2006. Flora of North America north of Mexico. Volume 19: Magnoliophyta: Asteridae, part 6: Asteraceae, part 1. Oxford University Press, New York.
    accepted
    yarrow (English)
    Milfoil (English)
    achillée (English)
    Subtropic to temperate and arctic regions of North America and Eurasia
    Stems 1 (–4+, clustered), usually erect, branched mostly distally, glabrous or sparsely to densely lanate (hairs usually basifixed).
    petiolate or sessile (bases ± clasping);
    blades (cauline equaling basal or slightly smaller distally) linear to oblong-lanceolate, usually 1–2 [–4] -pinnately lobed, ultimate margins entire, abaxial faces sparsely to densely lanate, adaxial faces glabrate to sparsely tomentose.
    Heads radiate [discoid], in compact to open (± flat-topped), simple or compound, corymbiform arrays [borne singly].
    Involucres campanulate to hemispheric, mostly 2–3 (–5+) mm diam.
    Phyllaries persistent, 10–30 in (1–) 2–3 (–4) series, oblong, ovate, or oblanceolate to lanceolate (midribs conspicuous), unequal, margins and apices (pale to black) scarious.
    Receptacles usually flat to slightly convex, rarely conic, paleate;
    paleae membranous, ± folded (sometimes each with central resin duct).
    Ray-florets [0] 3–5 (–12+), usually pistillate and fertile;
    corollas usually white (laminae yellow at bases), sometimes pale-yellow to pink or purple (tubes ± flattened), laminae orbiculate to suborbiculate (becoming reflexed).
    Disc-florets usually (5–) 15–75+, rarely 0, bisexual, fertile;
    corollas white to grayish or yellowish [yellow, pink], tubes ± flattened (bases ± saccate, clasping apices of cypselae), throats ± campanulate, lobes 5, ± deltate.
    Cypselae obcompressed, oblong to obovate (margins sometimes winged, apices rounded);
    ribs usually 2, lateral (sometimes plus 1 adaxial), faces glabrous (pericarps with myxogenic cells, sometimes with resin sacs; embryo-sac development monosporic).