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The stems are {{convert|1|–|2|m|ft|abbr=on}} tall, erect and furrowed, reddish to sometimes purple. The [[leaf|leaves]] are dark-green on the upper side and whitish and downy underneath, much divided, interruptedly pinnate, having a few large serrate leaflets and small intermediate ones. Terminal leaflets are large, 4–8 cm long, and three- to five-lobed.
Meadowsweet has delicate, graceful, creamy-white [[flower]]s clustered close together in irregularly-branched [[Cyme (botany)|cymes]], having a very strong, sweet smell. They flower from early summer to early autumn and are visited by various types of insects, in particular ''[[Musca (genus)|Musca]]'' flies.<ref>{{Cite journal | doi = 10.1111/plb.12328| title = Competition for pollinators and intra-communal spectral dissimilarity of flowers| journal = Plant Biology| pages = 56–62| year = 2015| last1 = Van Der Kooi | first1 = C. J.| last2 = Pen | first2 = I.| last3 = Staal | first3 = M.| last4 = Stavenga | first4 = D. G.| last5 = Elzenga | first5 = J. T. M.| url=https://www.researchgate.net
The flowers are small and numerous, they show 5 [[sepal]]s and 5 [[petal]]s with 7 to 20 stamens.<ref name="Parnell">Parnell, J. and Curtis, T. 2012. ''Webb's An Irish Flora''. Cork University Press. {{ISBN|978-185918-4783}}</ref>
==Diseases==
Many insects and fungi cause disease in meadowsweet.<ref name="Ellis - Filipendula ulmaria">{{cite web |last1=Ellis |first1=Willem N. |title=Filipendula ulmaria meadowsweet |url=https://bladmineerders.nl/host-plants/plantae/spermatopsida/angiosperma/eudicots/superrosids/rosids/fabids/rosales/rosaceae/rosoideae/ulmarieae/filipendula/filipendula-ulmaria/ |website=Plant Parasites of Europe
[[Image:Triphragmium ulmariae, Meadowsweet Rust.jpg|thumb|The [[meadowsweet rust gall]] on leaf midrib]] Meadowsweet leaves are commonly galled by the bright orange-rust fungus ''[[Meadowsweet rust gall|Triphragmium ulmariae]]'', which creates swellings and distortions on the stalk and/or midrib.
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