Achillea Linnaeus (Q2098)
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Achillea is a taxon with the rank genus within the subtribe Matricariinae
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Achillea Linnaeus
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Achillea is a taxon with the rank genus within the subtribe Matricariinae
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Statements
taxon/id/Achillea Linnaeus
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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
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Subtropic to temperate and arctic regions of North America and Eurasia
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Stems 1 (–4+, clustered), usually erect, branched mostly distally, glabrous or sparsely to densely lanate (hairs usually basifixed).
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petiolate or sessile (bases ± clasping);
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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.
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Heads radiate [discoid], in compact to open (± flat-topped), simple or compound, corymbiform arrays [borne singly].
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Involucres campanulate to hemispheric, mostly 2–3 (–5+) mm diam.
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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.
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Receptacles usually flat to slightly convex, rarely conic, paleate;
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paleae membranous, ± folded (sometimes each with central resin duct).
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Ray-florets [0] 3–5 (–12+), usually pistillate and fertile;
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corollas usually white (laminae yellow at bases), sometimes pale-yellow to pink or purple (tubes ± flattened), laminae orbiculate to suborbiculate (becoming reflexed).
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Disc-florets usually (5–) 15–75+, rarely 0, bisexual, fertile;
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corollas white to grayish or yellowish [yellow, pink], tubes ± flattened (bases ± saccate, clasping apices of cypselae), throats ± campanulate, lobes 5, ± deltate.
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Cypselae obcompressed, oblong to obovate (margins sometimes winged, apices rounded);
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ribs usually 2, lateral (sometimes plus 1 adaxial), faces glabrous (pericarps with myxogenic cells, sometimes with resin sacs; embryo-sac development monosporic).
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branched
mostly distally; distally
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glabrous or
sparsely densely lanate
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usually 1-2[-4]-pinnately
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