View source for Potentilla biennis

{{Treatment/ID
|accepted_name=Potentilla biennis
|accepted_authority=Greene
|publications={{Treatment/Publication
|title=Fl. Francisc.,
|place=65. 1891
|year=1891
}}
|common_names=Biennial or Greene’s cinquefoil
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms=
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Potentilla;Potentilla sect. Rivales;Potentilla biennis
|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 biennis]]</div></div>
|volume=Volume 9
|mention_page=page 137, 138, 139
|treatment_page=page 140
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Stems </b>ascending to erect, (1–)2–6(–8.5) dm, hairs at base not stiff, not tubercle-based, glands sparse to abundant, conspicuous (to 1 mm, septate). <b>Leaves</b> ternate, (2–)4–12(–25) cm; petiole (1–)2–8(–20) cm, long hairs sparse to common, spreading to ascending, 0.5–1.5(–3) mm, weak, crisped hairs usually absent, glands sparse to abundant, conspicuous (to 1 mm, septate); leaflets 3, at tip of leaf axis, usually overlapping, largest ones mostly obovate or oval to nearly round, (0.5–)1–3(–4) × 0.3–3(–3.5) cm, distal 3/4 to ± whole margin evenly to unevenly incised 1/4–1/3(–1/2) to midvein, teeth 3–8(–13) per side, surfaces sparsely to moderately hairy, rarely glabrate, glands sparse to abundant at least abaxially. <b>Inflorescences</b> (10–)20–70+-flowered. <b>Pedicels</b> 0.2–1(–2) cm. <b>Flowers</b>: epicalyx bractlets narrowly oblanceolate to narrowly obovate or elliptic, (1.5–)2–3.5(–4.5) × 0.5–1.5(–2) mm; hypanthium (2–)3–4(–5.5) mm diam.; sepals (2–)3–5 mm, apex broadly acute to obtuse; petals pale yellow to yellow, broadly oblanceolate to obovate, (1–)2–2.7 × 1.5 mm; stamens 10 or 15, filaments 0.5–1.2 mm, anthers 0.2–0.3 mm; carpels 40–100, styles 0.5–0.7 mm. <b>Achenes</b> whitish or pale yellowish, 0.5–0.9 mm, smooth, without a corky protuberance.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer.
|habitat=Moist meadows, stream banks, ditches, seepages
|elevation=400–3100 m
|distribution=Alta.;B.C.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Mex.;N.Dak.;Oreg.;Utah;Wash.;Wyo.
|discussion=<p><i>Potentilla biennis</i> may be recognized by its septate hairs with a round, terminal gland, which dominate the vestiture especially at the base of the plant. Stems are more commonly erect and leaflets rounder than those of <i>P. rivalis</i>. The species is most common along the eastern side of the Sierra <i>Nevada</i> of California, across the Intermountain Region to the Rocky Mountains. All specimens seen by the authors from Baja California, Mexico, which were previously referred to <i>P. biennis</i> are now assigned to <i>P. rivalis</i>.</p><!--
--><p>J. Soják (1996) lectotypified <i>Potentilla</i> millegrana Engelmann ex Lehmann upon a collection of <i>P. rivalis</i>, thus preventing <i>P. biennis</i> from being a later taxonomic synonym.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Potentilla biennis
|authority=Greene
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Rosaceae
|phenology=Flowering summer.
|habitat=Moist meadows, stream banks, ditches, seepages
|elevation=400–3100 m
|distribution=Alta.;B.C.;Sask.;Yukon;Alaska;Ariz.;Calif.;Colo.;Idaho;Mont.;Nev.;N.Mex.;N.Dak.;Oreg.;Utah;Wash.;Wyo.
|reference=None
|publication title=Fl. Francisc.,
|publication year=1891
|special status=Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V9/V9_202.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Potentilla
|section=Potentilla sect. Rivales
|species=Potentilla biennis
}}<!--

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