View source for Chaenactis sect. Macrocarphus

{{Treatment/ID
|accepted_name=Chaenactis sect. Macrocarphus
|accepted_authority=(Nuttall) Torrey & A. Gray
|publications={{Treatment/Publication
|title=Fl. N. Amer.
|place=2: 371. 1842
|year=1842
}}
|basionyms={{Treatment/ID/Basionym
|name=Undefined sect. Macrocarphus
|authority=Nuttall
|rank=section
|publication_title=Trans. Amer. Philos. Soc., n. s.
|publication_place=7: 376. 1841
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Chaenactidinae;Chaenactis;Chaenactis sect. Macrocarphus
|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>
|volume=Volume 21
|mention_page=page 401, 410
|treatment_page=page 403
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Biennials,</b> perennials, or subshrubs (rarely flowering first year); proximal indument predominantly arachnoid, lanuginose, or pannose (rarely glabrescent), not farinose. <b>Stems</b> 1–25+, prostrate to erect; branches mainly proximal. <b>Leaves</b>: largest blades deltate, elliptic, linear, or ovate, (0–)1–2-pinnately or -subpalmately lobed, gland-dotted beneath indument. <b>Heads</b> discoid. <b>Peduncles</b> prostrate to erect. <b>Phyllaries</b>: outer ± blunt. <b>Corollas</b> white to pinkish or cream, actinomorphic, ± equal. <b>Cypselae</b> ± terete; pappi of (8–)10–20 scales in 2–4 equal or gradually unequal series. <b>x</b> = 6.</span><!--

-->{{Treatment/Body
|distribution=w North America;nw Mexico.
|discussion=<p>Species 8 (8 in the flora).</p><!--
--><p>Species of sect. Macrocarphus occur mainly in montane to alpine habitats; all except <i>Chaenactis douglasii</i> are narrowly distributed. With <i>C. douglasii</i> here broadly defined, all the species of sect. Macrocarphus are sharply distinct.</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Leaves ± cauline and, often, basal; plants not or scarcely cespitose, not matted; heads (1–)2–25+ per stem
|[[#key-0-2| > 2]]
|-id=key-0-1
|1
|Leaves ± basal; plants cespitose or ± matted; heads 1(–3) per stem
|[[#key-0-5| > 5]]
|-id=key-0-2
|2
|Subshrubs (usually); proximal indument (especially stems) persistent, whitish, densely lanuginose or pannose; largest leaf blades deltate to ovate, ± plane (California)
|[[#key-0-3| > 3]]
|-id=key-0-2
|2
|Biennials or perennials (rarely slightly woody or flowering first year); proximal indument ± thinning with age, grayish, arachnoid to ± lanuginose; largest leaf blades ± elliptic or lanceolate to ovate, plane or ± 3-dimensional
|[[#key-0-4| > 4]]
|-id=key-0-3
|3
|Phyllaries: longest 10–13 mm, outer predominantly arachnoid to closely lanuginose (sparsely, if at all, stipitate-glandular)
|[[Chaenactis parishii|Chaenactis parishii]]
|-id=key-0-3
|3
|Phyllaries: longest 14–18 mm, outer predominantly stipitate-glandular (other indument none or sparse)
|[[Chaenactis suffrutescens|Chaenactis suffrutescens]]
|-id=key-0-4
|4
|Outer phyllaries usually densely, sometimes sparsely or obscurely, stipitate-glandular and, often, arachnoid, lanuginose, and/or villous; largest leaf blades ± 3-dimensional, usually 2-pinnately lobed, primary lobes ± congested, ultimate lobes ± involute and/or twisted
|[[Chaenactis douglasii|Chaenactis douglasii]]
|-id=key-0-4
|4
|Outer phyllaries closely lanuginose, not stipitate-glandular; largest leaf blades ± plane, 1-pinnately lobed, lobes remote, ± plane (Washington)
|[[Chaenactis thompsonii|Chaenactis thompsonii]]
|-id=key-0-5
|5
|Outer phyllaries predominantly arachnoid, sericeous, or ± lanuginose (sparsely, if at all, stipitate-glandular)
|[[#key-0-6| > 6]]
|-id=key-0-5
|5
|Outer phyllaries predominantly or evidently stipitate-glandular (other indument none, sparse, or ± arachnoid)
|[[#key-0-8| > 8]]
|-id=key-0-6
|6
|Cypselae sparsely glandular amidst other indument; largest leaf blades 2-pinnately lobed (± 3-dimensional, primary lobes 4–12 pairs, peduncles mostly ascending to erect)
|[[Chaenactis douglasii|Chaenactis douglasii]]
|-id=key-0-6
|6
|Cypselae eglandular; largest leaf blades (0–)1(–2)-pinnately or -subpalmately lobed (± plane, and/or primary lobes 0–4 pairs, and/or peduncles mostly prostrate)
|[[#key-0-7| > 7]]
|-id=key-0-7
|7
|Longest pappus scales 2.5–4.5 mm (lengths 0.4–0.8 times corollas); leaf blades ± plane; peduncles mostly ascending to erect; Idaho
|[[Chaenactis evermannii|Chaenactis evermannii]]
|-id=key-0-7
|7
|Longest pappus scales 5–8 mm (lengths 0.9–1 times corollas); leaf blades ± plane or 3-dimensional; peduncles mostly prostrate; California, Nevada
|[[Chaenactis alpigena|Chaenactis alpigena]]
|-id=key-0-8
|8
|Largest leaf blades deltate to ovate, ± plane, ultimate lobes ± plane
|[[#key-0-9| > 9]]
|-id=key-0-8
|8
|Largest leaf blades linear-cylindric to ± elliptic or slightly ovate, ± 3-dimensional, ultimate lobes ± involute and/or twisted
|[[#key-0-10| > 10]]
|-id=key-0-9
|9
|Plants 2–10(–12) cm; leaves 2.5–5 cm; longest phyllaries 9–12(–14) mm; corol-las 5.5–8 mm; longest pappus scales 3–5 mm
|[[Chaenactis nevadensis|Chaenactis nevadensis]]
|-id=key-0-9
|9
|Plants (10–)25–45(–60) cm; leaves 5–10 cm; longest phyllaries 14–18 mm; corollas 8.5–10 mm; longest pappus scales 7–9 mm
|[[Chaenactis suffrutescens|Chaenactis suffrutescens]]
|-id=key-0-10
|10
|Largest leaf blades ± elliptic to slightly ovate, primary lobes (4–)5–9(–12) pairs, ± congested, scarcely imbricate; not s California
|[[Chaenactis douglasii|Chaenactis douglasii]]
|-id=key-0-10
|10
|Largest leaf blades linear-cylindric to ± fusiform, primary lobes (7–)10–18+ pairs, ± imbricate; s California
|[[Chaenactis santolinoides|Chaenactis santolinoides]]
|}
</div></div><!--

-->{{#Taxon:
name=Chaenactis sect. Macrocarphus
|authority=(Nuttall) Torrey & A. Gray
|rank=section
|parent rank=genus
|synonyms=
|basionyms=Undefined sect. Macrocarphus
|family=Asteraceae
|distribution=w North America;nw Mexico.
|reference=None
|publication title=Fl. N. Amer.
|publication year=1842
|special status=
|source xml=https://bitbucket.org/aafc-mbb/fna-data-curation/src/2e0870ddd59836b60bcf96646a41e87ea5a5943a/coarse_grained_fna_xml/V19-20-21/V21_1015.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae
|genus=Chaenactis
|section=Chaenactis sect. Macrocarphus
}}<!--

-->[[Category:Treatment]][[Category:Chaenactis]]