View source for Amphiachyris

{{Treatment/ID
|accepted_name=Amphiachyris
|accepted_authority=(de Candolle) Nuttall
|publications={{Treatment/Publication
|title=Trans. Amer. Philos. Soc., n. s.
|place=7: 313. 1840
|year=1840
}}
|common_names=Broomweed
|basionyms={{Treatment/ID/Basionym
|name=Brachyris sect. Amphiachyris
|authority=de Candolle
|publication_title=Mém. Soc. Phys. Genève
|publication_place=7: 266. 1836
}}
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Astereae;Amphiachyris
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Asteraceae]]</div><div class="higher-taxon"><small>tribe</small>[[Asteraceae tribe Astereae]]</div><div class="higher-taxon"><small>genus</small>[[Amphiachyris]]</div></div>
|etymology=Greek amphi -, around, and achyron, chaff or husks, alluding to ring of pappus elements
|volume=Volume 20
|mention_page=page 9, 88, 89, 95
|treatment_page=page 87
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 20–100(–200) cm (glabrous, with strong terpenoid smell when crushed; taprooted). <b>Stems</b> erect, usually branched distally (bases usually lignescent). <b>Leaves</b> cauline; alternate; sessile; blades (1- or 3-nerved) linear to lanceolate, margins entire, faces gland-dotted. <b>Heads</b> radiate, in paniculiform or corymbiform arrays. <b>Involucres</b> narrowly campanulate to turbinate, 2–4 mm diam. <b>Phyllaries</b> 12–15 in 1–2(–3) series, 1-nerved (nerves without green margins) ovate, unequal, proximal 2/3 indurate, margins hyaline, faces whitish resinous. <b>Receptacles</b> flat to slightly convex, smooth (glabrous or hairy with multicellular, 1-seriate hairs), epaleate. <b>Ray</b> florets 7–12, pistillate, fertile; corollas yellow, sometimes drying orange-tinged. <b>Disc</b> florets 10–21, functionally staminate; corollas yellow, tubes shorter than cylindric throats, lobes 5, erect, deltate; style-branch appendages fused (pappi of 5–8 white, basally connate, linear, spatulate-tipped scales in 1 series, ± equaling corollas). <b>Cypselae</b> (ray, purplish black) obovoid-turbinate, plump, 4–9-ribbed (apices attenuate to slightly clavate), faces densely long- or short-setulose (hairs appressed, white), mostly occurring in lines between ribs; pappi coroniform. <b>x</b> = 4, 5.</span><!--

-->{{Treatment/Body
|distribution=c United States.
|discussion=<p>Species 2 (2 in the flora).</p><!--
--><p><i>Amphiachyris</i> was recently treated within a more inclusive <i>Gutierrezia</i> (G. M. Diggs et al. 1999); apparently, it is more closely related to monotypic <i>Thurovia</i> than to <i>Gutierrezia</i> (Y. Suh and B. B. Simpson 1990). <i>Amphiachyris</i> is distinguished from <i>Gutierrezia</i> by a combination of glandular hairs only on the abaxial leaf faces, functionally staminate disc florets, disc pappi of basally connate, narrowly spatulate scales ± equaling corollas, and abaxial nerves of the phyllaries without green borders.</p>
|tables=
|references={{Treatment/Reference
|id=lane1979a
|text=Lane, M. A. 1979. Taxonomy of the genus Amphiachyris (Asteraceae: Astereae). Syst. Bot. 4: 178–189.
}}
}}<!--

--><div class="treatment-key">
==Key==
<div class="treatment-key-group">
  
{| class="wikitable fna-keytable"
|-id=key-0-1
|1
|Plants 20–40(–60) cm; heads in open paniculiform arrays; cypselae 4–6-ribbed, long-setulose; leaf blades 0.2–1(–2) mm wide; receptacles with hooked, swollen-based hairs
|[[Amphiachyris amoena|Amphiachyris amoena]]
|-id=key-0-1
|1
|Plants 30–100(–200) cm; heads in crowded corymbiform arrays; cypselae 7–9-ribbed, short-setulose; leaf blades 0.5–6 mm wide; receptacles glabrous
|[[Amphiachyris dracunculoides|Amphiachyris dracunculoides]]
|}
</div></div><!--

-->{{#Taxon:
name=Amphiachyris
|author=Guy L. Nesom
|authority=(de Candolle) Nuttall
|rank=genus
|parent rank=tribe
|synonyms=
|basionyms=Brachyris sect. Amphiachyris
|family=Asteraceae
|illustrator=Barbara Alongi
|distribution=c United States.
|reference=lane1979a
|publication title=Trans. Amer. Philos. Soc., n. s.
|publication year=1840
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V20_167.xml
|tribe=Asteraceae tribe Astereae
|genus=Amphiachyris
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae tribe Astereae]]