View source for Myriophyllum humile

{{Treatment/ID
|accepted_name=Myriophyllum humile
|accepted_authority=(Rafinesque) Morong
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=18: 242. 1891
|year=1891
}}
|common_names=Western water-milfoil;myriophylle menu
|basionyms={{Treatment/ID/Basionym
|name=Burshia humilis
|authority=Rafinesque
|rank=species
|publication_title=Med. Repos., hexade
|publication_place=2, 5: 357.  1808
}}
|synonyms={{Treatment/ID/Synonym
|name=Myriophyllum ambiguum var. limosum
|authority=Nuttall
|rank=variety
}} {{Treatment/ID/Synonym
|name=M. procumbens
|authority=Bigelow
|rank=species
}}
|hierarchy=Haloragaceae;Myriophyllum;Myriophyllum humile
|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 humile]]</div></div>
|volume=Volume 10
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs </b>monoecious, aquatic or semiaquatic, usually not forming dense stands. <b>Stems</b> often branched, to 1 m. <b>Turions</b> absent. <b>Leaves</b> usually alternate or opposite, rarely in whorls of 3(or 4), heteromorphic; petiole to 4 mm; submersed leaves pectinate, ovate to elliptic in outline, (5.5–)10–27(–30) × (4.4–)6–22(–33) mm, segments (2–)4–13(–14), linear-filiform, longest segment (3–)8–17(–22.5) mm; emersed leaves usually pectinate to pinnatifid proximally, linear to spatulate or lobed distally, 5–9(–12.5) × 0.3–3(–6) mm, segments (0–)4–6(–9). <b>Inflorescences</b> to 35 cm, sometimes submersed with flowers in axils of unmodified, pectinate leaves; flowers proximally pistillate, distally staminate; bracteoles cream, oblong to elliptic to ovate or triangular, 0.3–0.7 × 0.1–0.4 mm, margins entire or irregularly lobed, apex often aristate. <b>Staminate</b> flowers: sepals cream to stramineous, triangular, 0.1–0.2 × 0.1–0.2 mm; petals caducous, purple, elliptic to obovate, 0.6–1.5 × 0.3–0.7 mm; stamens 4, filaments to 0.9 mm, anthers 0.3–0.8 × 0.1–0.3 mm. <b>Pistillate</b> flowers: sepals cream to stramineous, triangular, 0.1–0.2 × 0.1 mm; petals caducous, purple, elliptic to obovate, 0.3–0.5 × 0.2–0.3 mm; pistils 0.7–0.9 mm, stigmas red to ± purple, to 0.2 mm. <b>Fruits</b> cylindric, deeply 4-lobed. <b>Mericarps</b> tan to red-brown or purple, cylindric to narrowly ovoid, (0.6–)0.8–1.2 × 0.4–0.6 mm, transversely elliptic to ovate, abaxial surface rounded, sparsely to densely tuberculate, tubercles relatively small, shallow, wings and ridges absent.</span><!--

-->{{Treatment/Body
|phenology=Flowering and fruiting Jun–Oct.
|habitat=Oligotrophic waters, lakes, ponds, streams.
|elevation=0–700 m.
|distribution=N.B.;N.S.;Que.;Conn.;Del.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;Pa.;R.I.;Vt.;Va.
|discussion=<p>Myriophyllum humile has a diminutive semiterrestrial growth form, referred to as var. limosum by T. Morong (1891), that has alternate and, typically, spatulate floral bracts that can be confused with the emergent form of M. pinnatum. In vegetative form, the leaves of M. pinnatum tend to be pectinate with a greater number of longer segments than those of M. humile, which are often linear, spatulate, or 4–6-lobed. When fruits are present, the two can be distinguished by the presence of winged ridges on the mericarps in M. pinnatum, which are absent in M. humile. Submersed forms of M. humile can be confused with M. farwellii because of the delicate nature of their leaves. M. humile has leaves mostly alternate and opposite; leaves in M. farwellii tend to be whorled or, sometimes, subverticillate, giving these plants a bushy appearance. Myriophyllum humile can be also confused with M. laxum (see 10. M. laxum discussion).</p><!--
--><p>All specimens examined from Minnesota labeled Myriophyllum humile have been misidentified and are other species of the genus. Only one sterile herbarium specimen labeled as M. humile from Wisconsin has been seen, but its identity could not be confirmed.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Myriophyllum humile
|authority=(Rafinesque) Morong
|rank=species
|parent rank=genus
|synonyms=Myriophyllum ambiguum var. limosum;M. procumbens
|basionyms=Burshia humilis
|family=Haloragaceae
|phenology=Flowering and fruiting Jun–Oct.
|habitat=Oligotrophic waters, lakes, ponds, streams.
|elevation=0–700 m.
|distribution=N.B.;N.S.;Que.;Conn.;Del.;Maine;Md.;Mass.;N.H.;N.J.;N.Y.;Pa.;R.I.;Vt.;Va.
|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/1f4bf54ae2f7dbd5376c45b4fe1b388e15b53086/coarse_grained_fna_xml/V10/V10_193.xml
|genus=Myriophyllum
|species=Myriophyllum humile
}}<!--

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