View source for Horkelia sericata

{{Treatment/ID
|accepted_name=Horkelia sericata
|accepted_authority=S. Watson
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=20: 364. 1885
|year=1885
}}
|common_names=Silky horkelia
|special_status={{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Potentilla sericata
|authority=(S. Watson) Greene
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Horkelia;Horkelia sect. Tridentatae;Horkelia sericata
|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>[[Horkelia]]</div><div class="higher-taxon"><small>section</small>[[Horkelia sect. Tridentatae]]</div><div class="higher-taxon"><small>species</small>[[Horkelia sericata]]</div></div>
|volume=Volume 9
|mention_page=page 249, 266
|treatment_page=page 265
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>± tufted, silvery. <b>Stems</b> ascending to erect, 1.5–4.5 dm, hairs 1 mm proximally, glands absent or sparse distally. <b>Basal</b> leaves ± cylindric to weakly planar, 3–10 × 0.3–1.2 cm, densely sericeous, often villous on margins apically; stipules usually entire or forked, rarely pinnately divided into linear lobes; leaflets (8–)10–20 per side, ± overlapping, elliptic to flabellate, 2–8 × 1–4 mm, 1/2–2/3 as wide as long, divided ± 1/2+ to midrib into (0–)2–4 elliptic lobes 1–2 mm wide, these not restricted to apex. <b>Cauline</b> leaves (2 or)3–5; stipules 3–8 mm, entire or shallowly 1–2-toothed. <b>Inflorescences</b> open, flowers arranged individually and/or in non-capitate glomerules. <b>Pedicels</b> 1–4 mm. <b>Flowers</b> 10 mm diam.; epicalyx bractlets linear-lanceolate, 1.5–3 × 0.5 mm, ± 2/3 length of sepals; hypanthium 1–1.5 × 2–3 mm, ± 1/2 to as deep as wide, interior glabrous; sepals spreading to reflexed, abaxially green to reddish or purplish, 2–4 mm; petals white to pink or red-veined, narrowly obcordate, 3–4.5(–7) × 2–3 mm, apex ± emarginate; filaments 0.5–1.5 × 0.2–0.5 mm, anthers 0.4–0.6 mm; carpels 2–6; styles 1.5–2 mm. <b>Achenes</b> brown, 2–2.5 mm, smooth. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer.
|habitat=Chaparral, oak-conifer woodlands, on serpentine-derived soil
|elevation=100–1200 m
|distribution=Calif.;Oreg.
|discussion=<p>Of conservation concern.</p><!--
--><p>D. D. Keck (1938) expanded the circumscription of <i>Horkelia sericata</i> to encompass the plants segregated here as <i>H. howellii</i>, on the grounds that intergradation is too extensive to justify taxonomic recognition of the extremes. In this evaluation, however, most collections can be unequivocally divided between plants with compact silvery-sericeous leaves with entire or forked stipules (<i>H. sericata</i>), and plants with larger, greener leaves and pinnately divided stipules (<i>H. howellii</i>). It is not known if the chromosome count provided by P. A. Munz (1959) was derived from <i>H. howellii</i> or <i>H. sericata</i>.</p><!--
--><p>As here circumscribed, <i>Horkelia sericata</i> is a localized taxon known only from Curry County, Oregon, and the Gasquet serpentine area in adjacent Del Norte County, California.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Horkelia sericata
|author=
|authority=S. Watson
|rank=species
|parent rank=section
|synonyms=Potentilla sericata
|basionyms=
|family=Rosaceae
|phenology=Flowering summer.
|habitat=Chaparral, oak-conifer woodlands, on serpentine-derived soil
|elevation=100–1200 m
|distribution=Calif.;Oreg.
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1885
|special status=Conservation concern;Endemic
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V9/V9_420.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Horkelia
|section=Horkelia sect. Tridentatae
|species=Horkelia sericata
}}<!--

-->[[Category:Treatment]][[Category:Horkelia sect. Tridentatae]]