View source for Chaenactis sect. Acarphaea

{{Treatment/ID
|accepted_name=Chaenactis sect. Acarphaea
|accepted_authority=(Harvey & A. Gray) A. Gray
|publications={{Treatment/Publication
|title=Proc. Amer. Acad. Arts
|place=10: 74. 1874
|year=1874
}}
|basionyms={{Treatment/ID/Basionym
|name=Undefined sect. Acarphaea
|authority=Harvey & A. Gray
|rank=section
|publication_title=Mem. Amer. Acad. Arts, n. s.
|publication_place=4: 98. 1849
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Chaenactidinae;Chaenactis;Chaenactis sect. Acarphaea
|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. Acarphaea]]</div></div>
|volume=Volume 21
|mention_page=page 411
|treatment_page=page 401
}}<!--

--><span class="statement" id="st-d0_s0" data-properties="whole-organism duration">Annuals;</span> <span class="statement" id="st-d0_s1" data-properties="proximal indument pubescence;proximal indument pubescence">proximal indument predominantly ± farinose, not arachnoid.</span> <span class="statement" id="st-d0_s2" data-properties="stem quantity;stem orientation"><b>Stems </b>usually 1, erect;</span> <span class="statement" id="st-d0_s3" data-properties="branch position or shape">branches mainly distal.</span> <span class="statement" id="st-d0_s4" data-properties="largest blade shape;largest blade shape"><b>Leaves:</b> largest blades deltate to ± ovate [broadly elliptic], (2–) 3–4-pinnately lobed, not glanddotted.</span> <span class="statement" id="st-d0_s5" data-properties="head architecture or shape"><b>Heads </b>discoid (mostly 3–20+ per stem).</span> <span class="statement" id="st-d0_s6" data-properties="peduncle orientation"><b>Peduncles </b>ascending to erect.</span> <span class="statement" id="st-d0_s7" data-properties="outer phyllary shape"><b>Phyllaries:</b> outer acute to acuminate-aristate.</span> <span class="statement" id="st-d0_s8" data-properties="corolla coloration;corolla architecture;corolla variability"><b>Florets:</b> corollas white to pinkish, actinomorphic, ± equal.</span> <span class="statement" id="st-d0_s9" data-properties="cypsela shape;cypsela shape"><b>Cypselae </b>± terete or compressed;</span> <span class="statement" id="st-d0_s10" data-properties="scale atypical quantity;scale atypical quantity;series quantity;series atypical quantity">pappi 0, coroniform (of ± 10 scales), or of 4 (–5) [10–16] scales in 1 [2–3] series.</span> <span class="statement" id="st-d0_s11" data-properties="pappus presence;pappus shape;x chromosome quantity">x = 8.</span><!--

-->{{Treatment/Body
|distribution=sw United States;nw Mexico
|discussion=<p>Species 3 (2 in the flora).</p>
|tables=
|references=
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Phyllaries: apices (all or inner) usually reddish, acuminate, aristate, terete; receptacles: paleae (0–)3–10+ (± phyllary-like, apices visible among mature floret buds); leaves: ultimate lobes ± terete; cypselae ± terete; involucres mostly 5–10 mm diam
|[[Chaenactis carphoclinia|Chaenactis carphoclinia]]
|-id=key-0-1
|1
|Phyllaries: apices (all) ± green, acute or scarcely acuminate, not aristate, ± plane; receptacles: paleae 0; leaves: ultimate lobes plane or involute; cypselae compressed; involucres mostly 10–25 mm diam
|[[#key-0-2| > 2]]
|-id=key-0-2
|2
|Pappi 0 or coroniform (of ± 10 scales, longest 0.1–0.5 mm); involucres mostly 10–15 mm diam.; phyllaries ± densely villous, not or sparsely glandular
|[[Chaenactis artemisiifolia|Chaenactis artemisiifolia]]
|-id=key-0-2
|2
|Pappi of 10–16 scales in 2–3 subequal series, longest scales 4–6 mm; involucres mostly 20–25 mm diam.; phyllaries ± glandular, not or sparsely villous
|[[see 1 Chaenactis artemisiifolia|Chaenactis lacera (see 1 Chaenactis artemisiifolia)]]
|}
</div></div><!--

-->{{#Taxon:
name=Chaenactis sect. Acarphaea
|authority=(Harvey & A. Gray) A. Gray
|rank=section
|parent rank=genus
|synonyms=
|basionyms=Undefined sect. Acarphaea
|family=Asteraceae
|distribution=sw United States;nw Mexico
|reference=None
|publication title=Proc. Amer. Acad. Arts
|publication year=1874
|special status=
|source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V21_1010.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Chaenactidinae
|genus=Chaenactis
|section=Chaenactis sect. Acarphaea
|branch position or shape=distal
|corolla architecture=actinomorphic
|corolla coloration=white;pinkish
|corolla variability=equal
|cypsela shape=compressed;terete
|head architecture or shape=discoid
|largest blade shape=lobed;deltate;more or less ovate
|outer phyllary shape=acute;acuminate-aristate
|pappus presence=absent
|pappus shape=coroniform
|peduncle orientation=ascending;erect
|proximal indument pubescence=not arachnoid;farinose
|scale atypical quantity=10;16
|series atypical quantity=2;3
|series quantity=1
|stem orientation=erect
|stem quantity=1
|whole-organism duration=annual
|x chromosome quantity=8
}}<!--

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