View source for Horkelia tenuiloba

{{Treatment/ID
|accepted_name=Horkelia tenuiloba
|accepted_authority=(Torrey) A. Gray
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=6: 529. 1865
|year=1865
}}
|common_names=Thin-lobed;Santa Rosa;or Sonoma horkelia
|special_status={{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}
|basionyms={{Treatment/ID/Basionym
|name=Horkelia fusca var. tenuiloba
|authority=Torrey
|publication_title=in War Department [U.S.], Pacif. Railr. Rep.
|publication_place=4(5): 84. 1857
}}
|synonyms={{Treatment/ID/Synonym
|name=Potentilla micheneri
|authority=Greene
}} {{Treatment/ID/Synonym
|name=P. stenoloba
|authority=Greene
}}
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Horkelia;Horkelia sect. Horkelia;Horkelia tenuiloba
|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. Horkelia]]</div><div class="higher-taxon"><small>species</small>[[Horkelia tenuiloba]]</div></div>
|volume=Volume 9
|mention_page=page 249, 251, 254
|treatment_page=page 252
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>loosely matted, green. <b>Stems</b> ascending to erect, 1–4 dm, hairs ± spreading. <b>Basal</b> leaves weakly planar to ± cylindric, 5–15(–20) × 0.5–1.5 cm; stipules entire; leaflets 8–16(–20) per side, ± overlapping especially distally, cuneate to flabellate, 3–10 × 2–10 mm, 1/2 to nearly as wide as long, divided 1/2–3/4+ to midrib into 3–8 linear to narrowly oblanceolate or narrowly elliptic lobes, sparsely villous at least marginally, often with a tuft of hairs apically. <b>Cauline</b> leaves 2–5. <b>Inflorescences</b> open to congested, flowers arranged individually and in glomerules, these sometimes subcapitate. <b>Pedicels</b> 1–6 mm. <b>Flowers</b> 10 mm diam.; epicalyx bractlets narrowly to broadly lanceolate, 1–3 × 0.5–1 mm, slightly shorter than sepals, entire; hypanthium 1–1.2 × 2.5–4.5 mm, less than 1/2 as deep as wide, interior pilose; sepals spreading to reflexed, lanceolate, 3–5 mm; petals oblanceolate, 2.5–4.5 × 1.5 mm, apex emarginate; filaments (1–)1.5–2 × 0.5 mm, anthers 0.4–0.6 mm; carpels 10–25; styles 1.8–2.2 mm. <b>Achenes</b> light brown, 1.5 mm, smooth or slightly rugose. <b>2n</b> = 28.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer.
|habitat=Sandy soil, openings, in chaparral, oak woodlands
|elevation=50–500 m
|distribution=Calif.
|discussion=<p>Of conservation concern.</p><!--
--><p><i>Horkelia tenuiloba</i> occurs on the western edges of the northern Coast Ranges in Marin, Mendocino, and Sonoma counties. Populations from San Luis Obispo formerly included in this species now are part of <i>H. yadonii</i>. A specimen (M. K. C[urran], July 5, 1885, UC) unequivocally of <i>H. tenuiloba</i> purportedly from San Luis Obispo is in all likelihood mislabeled with respect to locality.</p><!--
--><p><i>Horkelia tenuiloba</i> is commonly associated with seral openings in chaparral and woodlands and might be dependent on periodic disturbance by fire.</p><!--
--><p>W. L. Jepson (1909–1943, vol. 2) used <i>Potentilla</i> stenoloba (1895) for the species encompassing the types of <i>Horkelia tenuiloba</i> and P. micheneri. The epithet micheneri (1893) has priority at species rank within <i>Potentilla</i>, since <i>P. tenuiloba</i> (Torrey) Greene is a later homonym of <i>P. tenuiloba</i> Jordan.</p>
|tables=
|references=
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-->{{#Taxon:
name=Horkelia tenuiloba
|author=
|authority=(Torrey) A. Gray
|rank=species
|parent rank=section
|synonyms=Potentilla micheneri;P. stenoloba
|basionyms=Horkelia fusca var. tenuiloba
|family=Rosaceae
|phenology=Flowering summer.
|habitat=Sandy soil, openings, in chaparral, oak woodlands
|elevation=50–500 m
|distribution=Calif.
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1865
|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_393.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Horkelia
|section=Horkelia sect. Horkelia
|species=Horkelia tenuiloba
}}<!--

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