View source for Horkelia howellii

{{Treatment/ID
|accepted_name=Horkelia howellii
|accepted_authority=(Greene) Rydberg
|publications={{Treatment/Publication
|title=Bull. Torrey Bot. Club
|place=25: 55. 1898
|year=1898
}}
|common_names=Howell’s or Klamath horkelia
|special_status={{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}{{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=F
|label=Illustrated
}}
|basionyms={{Treatment/ID/Basionym
|name=Potentilla howellii
|authority=Greene
|rank=species
|publication_title=Pittonia
|publication_place=1: 104. 1887
}}
|synonyms=
|hierarchy=Rosaceae;Rosaceae subfam. Rosoideae;Rosaceae tribe Potentilleae;Horkelia;Horkelia sect. Tridentatae;Horkelia howellii
|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 howellii]]</div></div>
|volume=Volume 9
|mention_page=page 266
|treatment_page=page 265
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Plants </b>tufted to openly matted, ± green. <b>Stems</b> ascending to erect, (0.9–)1.5–5 dm, hairs 1 mm proximally, glands absent or sparse distally. <b>Basal</b> leaves ± cylindric to weakly planar, 5–15 × 0.5–1.8(–2.5) cm, usually villous to pilose at least marginally, often glabrescent; stipules deeply 2-lobed or pinnately divided into 3–5 linear to filiform lobes that often form a tangled mass; leaflets 10–15 per side, ± overlapping, elliptic to flabellate, (3–)4–10(–15) × 2–8 mm, 1/2 to as wide as long, divided 1/2–3/4 to midrib into (0–)2–4 elliptic to linear lobes 1–2 mm wide, these not restricted to apex. <b>Cauline</b> leaves (2 or)3–5; stipules 5–12(–15) mm, entire to deeply 2–4-lobed or -toothed (usually on 1 side). <b>Inflorescences</b> open, flowers arranged individually and/or in non-capitate glomerules. <b>Pedicels</b> 1–6(–12) mm. <b>Flowers</b> 10 mm diam.; epicalyx bractlets linear-lanceolate, 1–3 × 0.5 mm, ± 2/3 length of sepals; hypanthium 1.1–1.5 × 2–3 mm, ± 1/2 to as deep as wide, interior glabrous; sepals spreading to reflexed, abaxially green to reddish or purplish, 2.5–4.5 mm; petals white to pink or red-veined, narrowly obcordate, 3–5 × 2–3 mm, apex truncate or emarginate; filaments 0.5–1.7 × 0.2–0.5 mm, anthers 0.4–0.6 mm; carpels 2–6; styles 1.5–2 mm. <b>Achenes</b> brown, 2–2.7 mm, smooth.</span><!--

-->{{Treatment/Body
|phenology=Flowering summer.
|habitat=Chaparral, oak-conifer woodlands, mainly on serpentine soil
|elevation=60–1200 m
|distribution=Calif.;Oreg.
|discussion=<p>Of conservation concern.</p><!--
--><p>As noted above, <i>Horkelia howellii</i> comprises the bulk of what D. D. Keck (1938) and subsequent floras included in <i>H. sericata</i>, and the range of the latter is fully encompassed within that of the former. As here circumscribed, <i>H. howellii</i> occurs in northwestern California and southwestern Oregon. The handful of collections from Humboldt and Trinity counties, California, including the type of <i>Potentilla</i> laxiflora Drew, have leaves approaching <i>H. daucifolia</i> but the inflorescence of <i>H. howellii</i>; exact petal color is uncertain.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Horkelia howellii
|authority=(Greene) Rydberg
|rank=species
|parent rank=section
|synonyms=
|basionyms=Potentilla howellii
|family=Rosaceae
|phenology=Flowering summer.
|habitat=Chaparral, oak-conifer woodlands, mainly on serpentine soil
|elevation=60–1200 m
|distribution=Calif.;Oreg.
|reference=None
|publication title=Bull. Torrey Bot. Club
|publication year=1898
|special status=Conservation concern;Endemic;Illustrated
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V9/V9_421.xml
|subfamily=Rosaceae subfam. Rosoideae
|tribe=Rosaceae tribe Potentilleae
|genus=Horkelia
|section=Horkelia sect. Tridentatae
|species=Horkelia howellii
}}<!--

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