View source for Potentilla rivalis

{{Treatment/ID
|accepted_name=Potentilla rivalis
|accepted_authority=Nuttall in J. Torrey and A. Gray
|publications={{Treatment/Publication
|title=in J. Torrey and A. Gray, Fl. N. Amer.
|place=1: 437. 1840
|year=1840
}}
|common_names=Brook or river cinquefoil
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Potentilla millegrana
|authority=Engelmann ex Lehmann
}} {{Treatment/ID/Synonym
|name=P. pentandra
|authority=Engelmann
}} {{Treatment/ID/Synonym
|name=P. rivalis var. millegrana
|authority=(Engelmann ex Lehmann) S. Watson
}} {{Treatment/ID/Synonym
|name=P. rivalis var. pentandra
|authority=(Engelmann) S. Watson
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Potentilla;Potentilla sect. Rivales;Potentilla rivalis
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Rosaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Rosaceae subfam. Rosoideae]]</div><div class="higher-taxon"><small>tribe</small>[[Rosaceae tribe Potentilleae]]</div><div class="higher-taxon"><small>genus</small>[[Potentilla]]</div><div class="higher-taxon"><small>section</small>[[Potentilla sect. Rivales]]</div><div class="higher-taxon"><small>species</small>[[Potentilla rivalis]]</div></div>
|volume=Volume 9
|mention_page=page 138, 140
|treatment_page=page 139
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>decumbent to erect, sometimes prostrate, (0.5–)1–4(–7) dm, hairs at base not stiff, not tubercle-based, glands absent or sparse, inconspicuous. <b>Leaves</b> ternate, palmate, or subpalmate (with distal leaflets ± confluent), basal 3–15(–25) cm, cauline 2–7(–12) cm; petiole: basal 1–9(–16) cm, cauline 0.5–4(–8) cm, long hairs usually common to abundant, ascending to spreading, 0.5–1.5 mm, usually ± weak, ± crisped hairs common to abundant, glands absent or sparse, inconspicuous; leaflets 3–5(–7), at tip to distal 1/5 (basal) or 1/2 (cauline) of leaf axis, separate to ± overlapping, largest ones oblanceolate-elliptic to obovate, (0.5–)1–5(–6) × 0.5–2(–2.5) cm, distal 1/2–3/4 of margin evenly to unevenly incised 1/3–1/2 to midvein, sometimes cleft nearly to base, teeth 3–8 per side, surfaces moderately to abundantly hairy, glands absent or sparse. <b>Inflorescences</b> (5–)20–100+-flowered. <b>Pedicels</b> 0.2–1(–2) cm. <b>Flowers</b>: epicalyx bractlets narrowly elliptic to ovate, (1.5–)2–4(–6) × 0.8–1.5 mm; hypanthium (2–)3–5 mm diam.; sepals 3–5 mm, apex broadly acute to obtuse; petals pale yellow to yellow, broadly oblong-obovate, 1.5–2 × 1 mm; stamens (5–)10(–15), filaments 0.4–0.9 mm, anthers 0.2–0.3 mm; carpels 40–100, styles 0.5–0.6 mm. <b>Achenes</b> yellowish, 0.7–0.9 mm, ± smooth, without a corky protuberance. <b>2n</b> = 14, 70.</span><!--

-->{{Treatment/Body
|phenology=Flowering spring–summer.
|habitat=Moist meadows, stream banks, lakeshores, gravel bars in flood plains, drying marshes, open areas in river-bottom forests
|elevation=200–2400 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Calif.;Colo.;Idaho;Ill.;Iowa;Kans.;Maine;Md.;Mass.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.Mex.;N.Y.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Va.;Wash.;Wis.;Wyo.;Mexico (Baja California).
|discussion=<p><i>Potentilla rivalis</i> is most abundant in central and western North America; reports of occurrences in more eastern states (including those listed here) need confirming, as <i>P. rivalis</i> and <i>P. norvegica</i> often have been confused. <i>Potentilla</i> leucocarpa Rydberg was provided as a superfluous replacement name for P. millegrana; specimens annotated by Rydberg with this name include both <i>P. biennis</i> and <i>P. rivalis</i>.</p><!--
--><p><i>Potentilla rivalis</i> is sometimes divided into three species or varieties (for example, H. J. Scoggan 1978–1979). In a strict sense, var. rivalis has subpalmately compound (5-foliate) leaves. Variety milligrana, the most common phase, has 3-foliate leaves. Plants with both 3- and 5-foliolate leaves are var. pentandra, which also tends to have five stamens, though this latter character is not correlated with the leaf features. On the Great Plains, where var. pentandra is confined, all three expressions are often found in a single population (R. L. McGregor 1986b).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Potentilla rivalis
|author=
|authority=Nuttall in J. Torrey and A. Gray
|rank=species
|parent rank=section
|synonyms=Potentilla millegrana;P. pentandra;P. rivalis var. millegrana;P. rivalis var. pentandra
|basionyms=
|family=Rosaceae
|phenology=Flowering spring–summer.
|habitat=Moist meadows, stream banks, lakeshores, gravel bars in flood plains, drying marshes, open areas in river-bottom forests
|elevation=200–2400 m
|distribution=Alta.;B.C.;Man.;Ont.;Sask.;Ariz.;Calif.;Colo.;Idaho;Ill.;Iowa;Kans.;Maine;Md.;Mass.;Minn.;Mo.;Mont.;Nebr.;Nev.;N.Mex.;N.Y.;N.Dak.;Okla.;Oreg.;S.Dak.;Tex.;Utah;Va.;Wash.;Wis.;Wyo.;Mexico (Baja California).
|reference=None
|publication title=in J. Torrey and A. Gray, Fl. N. Amer.
|publication year=1840
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_201.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Potentilla
|section=Potentilla sect. Rivales
|species=Potentilla rivalis
}}<!--

-->[[Category:Treatment]][[Category:Potentilla sect. Rivales]]