View source for Myriophyllum farwellii

{{Treatment/ID
|accepted_name=Myriophyllum farwellii
|accepted_authority=Morong
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=18: 146. 1891
|year=1891
}}
|common_names=Farwell’s water-milfoil;myriophylle de Farwell
|basionyms=
|synonyms=
|hierarchy=Haloragaceae;Myriophyllum;Myriophyllum farwellii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Haloragaceae]]</div><div class="higher-taxon"><small>genus</small>[[Myriophyllum]]</div><div class="higher-taxon"><small>species</small>[[Myriophyllum farwellii]]</div></div>
|volume=Volume 10
|mention_page=
|treatment_page=
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--><span class="statement" id="st-undefined" data-properties=""><b>Herbs </b>monoecious, aquatic, often forming dense stands. <b>Rhizomes</b> absent. <b>Stems</b> delicate, often branched, to 1 m, with numerous black, ascidiate trichomes. <b>Turions</b> present, green to brown, very narrowly cylindrical, with gradual and moderate transition from foliage leaves to slightly reduced turion leaves, to 10 cm, apex ± rounded; leaves pectinate and stiff, strongly appressed to axis, elliptic to narrowly obovate in outline, 11–23(–40) × 1.5–3(–4) mm; segments 6–12(–14), longest segment (1.5–)3–5.5 mm, basal segment less than or equal to 2/3 central axis of leaf, apex acute; brown, ascidiate trichomes scattered on surfaces and in axils. <b>Leaves</b> all submersed, usually in whorls of 3(or 4), sometimes alternate or subverticillate, homomorphic; petiole 0–3 mm; leaves pectinate, ovate to elliptic or obovate in outline, (6–)10–20(–25) × (4–)7–15 mm, segments (7–)10–14(–16), linear-filiform, longest segment (4–)8–15(–22) mm, with black ascidiate trichomes scattered on surfaces and in axils. <b>Inflorescences</b> submersed, to 30 cm; flowers bisexual; bracteoles cream, trullate, 0.2–0.5(–0.8) × (0.1–)0.3–0.5 mm, margins entire or irregularly lobed, lobes with glandular fringe. <b>Bisexual</b> flowers: sepals green to cream or ± purple, ovate to trullate, 0.1–0.5(–0.7) × 0.1–0.3(–0.5) mm; petals persistent, cream to purple, elliptic to obovate, 0.6–1.3 × 0.3–0.8 mm; stamens 4, filaments to 0.5 mm, anthers 0.2–0.4 × 0.1–0.3 mm; pistils 0.8–1.2 × 0.2–0.3 mm, stigmas red to ± purple, to 0.5 mm. <b>Fruits</b> cylindric to subglobose, deeply 4-lobed. <b>Mericarps</b> tan to brown, cylindric, (1–)1.5–2.5 × 0.5–0.9 mm, transversely hexagonal (rounded to obtusely angled adaxially), abaxial surface shallowly 4-angled, smooth or sparsely tuberculate, with 4 longitudinal ridges, ridges with irregular, shallow to pronounced, membranous wings, ribs absent. <b>2n</b> = 14.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting Jun–Aug.
|habitat=Oligotrophic to mesotrophic, often highly tannic waters, lakes, ponds, and marshes.
|elevation=0–600.
|distribution=B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;Que.;Alaska;Conn.;Maine;Mass.;Mich.;Minn.;N.H.;N.Y.;Pa.;R.I.;Vt.;Wis.
|discussion=<p>Myriophyllum farwellii is distinguished from other water-milfoils, except M. humile, by submersed flowers and fruits in the axils of foliage leaves. It differs from M. humile by having distinctly larger, winged mericarps that are transversely hexagonal, versus smaller, wingless mericarps that are transversely elliptic to ovate. It produces elongate turions by midsummer with stiff, reduced leaves. These reduced leaves, which are dark green to black, are often visible at the base of new shoots in the next growing season, which can be an aid for identification. Its foliage leaves are mostly produced in whorls, contrary to what has been stated in the literature concerning an alternate or opposite arrangement.</p>
|tables=
|references=
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-->{{#Taxon:
name=Myriophyllum farwellii
|authority=Morong
|rank=species
|parent rank=genus
|synonyms=
|basionyms=
|family=Haloragaceae
|phenology=Flowering and fruiting Jun–Aug.
|habitat=Oligotrophic to mesotrophic, often highly tannic waters, lakes, ponds, and marshes.
|elevation=0–600.
|distribution=B.C.;Man.;N.B.;Nfld. and Labr. (Nfld.);N.S.;Ont.;Que.;Alaska;Conn.;Maine;Mass.;Mich.;Minn.;N.H.;N.Y.;Pa.;R.I.;Vt.;Wis.
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1891
|special status=
|source xml=https://xjsachs2@bitbucket.org/aafc-mbb/fna-data-curation.git/src/e39f0e846f172941159b2045254d62d10d9823f6/coarse_grained_fna_xml/V10/V10_184.xml
|genus=Myriophyllum
|species=Myriophyllum farwellii
}}<!--

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