View source for Chaenactis thompsonii

{{Treatment/ID
|accepted_name=Chaenactis thompsonii
|accepted_authority=Cronquist
|publications={{Treatment/Publication
|title=in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W.
|place=5: 123, fig. [p. 125]. 1955
|year=1955
}}
|common_names=Thompson’s pincushion
|special_status={{Treatment/ID/Special_status
|code=E
|label=Endemic
}}{{Treatment/ID/Special_status
|code=C
|label=Conservation concern
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Chaenactidinae;Chaenactis;Chaenactis sect. Macrocarphus;Chaenactis thompsonii
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Heliantheae]]</div><div class="higher-taxon"><small>subtribe</small>[[Asteraceae (tribe Heliantheae) subtribe Chaenactidinae]]</div><div class="higher-taxon"><small>genus</small>[[Chaenactis]]</div><div class="higher-taxon"><small>section</small>[[Chaenactis sect. Macrocarphus]]</div><div class="higher-taxon"><small>species</small>[[Chaenactis thompsonii]]</div></div>
|volume=Volume 21
|mention_page=page 404, 408, 410
|treatment_page=page 407
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 10–30 cm (not or scarcely cespitose, not matted); proximal indument thinning with age, grayish, arachnoid-sericeous to thinly lanuginose. <b>Stems</b> mostly 5–15+, ascending to erect. <b>Leaves</b> mostly cauline, 2–5 cm; largest blades ± elliptic, ± plane, 1-pinnately lobed; lobes mostly 2–5 pairs, remote, ± plane. <b>Heads</b> mostly 1–3 per stem. <b>Peduncles</b> ascending to erect, 2–5 cm. <b>Involucres</b> ± obconic. <b>Phyllaries</b>: longest (10–)12–15 mm; outer closely lanuginose, not stipitate-glandular, apices erect, ± rigid. <b>Corollas</b> 7–9 mm. <b>Cypselae</b> 7–9 mm (eglandular); pappi: longest scales 3.5–5 mm.</span><!--

-->{{Treatment/Body
|phenology=Flowering Jun–Aug.
|habitat=Rocky or gravelly serpentine slopes, scree, talus, openings in or above conifer forests
|elevation=(900–)1200–2200 m
|distribution=Wash.
|discussion=<p>Of conservation concern.</p><!--
--><p><i>Chaenactis thompsonii</i> appears to be sister to <i>C. evermannii</i>; it is known from the mountains of central and northwestern Washington. The similar habits of <i>C. thompsonii</i> and C. ramosa (= <i>C. douglasii </i>var.<i> douglasii</i>) appear to result from convergent evolution in the distinctive habitat of their type localities (Wenatchee Mountains), not from a close genetic relationship as suggested by Cronquist.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Chaenactis thompsonii
|authority=Cronquist
|rank=species
|parent rank=section
|synonyms=
|basionyms=
|family=Asteraceae
|phenology=Flowering Jun–Aug.
|habitat=Rocky or gravelly serpentine slopes, scree, talus, openings in or above conifer forests
|elevation=(900–)1200–2200 m
|distribution=Wash.
|reference=None
|publication title=in C. L. Hitchcock et al., Vasc. Pl. Pacif. N.W.
|publication year=1955
|special status=Endemic;Conservation concern
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1023.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae
|genus=Chaenactis
|section=Chaenactis sect. Macrocarphus
|species=Chaenactis thompsonii
}}<!--

-->[[Category:Treatment]][[Category:Chaenactis sect. Macrocarphus]]