View source for Hemizonia

{{Treatment/ID
|accepted_name=Hemizonia
|accepted_authority=de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
|publications={{Treatment/Publication
|title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|place=5: 692. 1836
|year=1836
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Madiinae;Hemizonia
|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 Madiinae]]</div><div class="higher-taxon"><small>genus</small>[[Hemizonia]]</div></div>
|etymology=Greek hemi -, half, and zona, belt or girdle, alluding to cypselae half enfolded by phyllaries
|volume=Volume 21
|mention_page=page 254, 256, 276, 280, 289, 290, 294
|treatment_page=page 291
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Annuals,</b> 5–80 cm. <b>Stems</b> ± erect. <b>Leaves</b> mostly cauline; proximal opposite (forming winter–spring rosettes, sometimes present at flowering), mostly alternate; sessile; blades narrowly elliptic to linear or lance-linear, margins serrulate or entire, faces puberulent, hispidulous, hirsute, strigose, sericeous, or villous (distal leaves sometimes stipitate-glandular as well). <b>Heads</b> radiate, borne singly or in ± paniculiform, racemiform, or spiciform arrays or in glomerules. <b>Peduncular</b> bracts: pit-glands, tack-glands, and/or spines 0. <b>Involucres</b> hemispheric to ± urceolate or globose, 3–8+ mm diam. (usually subtended by calyculi of 5–7 bractlets in <i>H. congesta </i>subsp.<i> calyculata</i>). <b>Phyllaries</b> 5–14 in 1 series (linear to lanceolate or oblanceolate, herbaceous, each usually 1/2 enveloping a subtended ray floret proximally, abaxially pubescent to hirsute or villous, and stipitate-glandular). <b>Receptacles</b> flat to conic, glabrous, paleate (paleae connate, forming cells around all or most individual disc florets, scarious, ± deliquescent). <b>Ray</b> florets 5–14, pistillate, fertile; corollas white or yellow (often purple-veined abaxially). <b>Disc</b> florets 5–60+, functionally staminate; corollas white or yellow, tubes shorter than funnelform throats, lobes 5, deltate (anthers ± dark purple; styles glabrous proximal to branches). <b>Ray</b> cypselae ± obcompressed, abaxially gibbous, basal attachments oblique, apices sometimes beaked, beaks inconspicuous, straight, diameters greater than lengths, faces glabrous; pappi 0. <b>Disc</b> cypselae 0; pappi 0. <b>x</b> = 14.</span><!--

-->{{Treatment/Body
|distribution=w North America.
|discussion=<p>Species 1.</p><!--
--><p><i>Hemizonia</i> as often circumscribed (to include <i>Centromadia</i> and <i>Deinandra</i>) is polyphyletic; molecular phylogenetic studies have indicated that <i>Centromadia</i> and <i>Deinandra</i> are more closely related to <i>Calycadenia</i>, <i>Holocarpha</i>, and <i>Osmadenia</i> than to <i>Hemizonia</i> in the strict sense, which is most closely related to <i>Blepharizonia</i>, also with 2n = 28 (S. Carlquist et al. 2003). Crosses between taxa of <i>Hemizonia</i> have yielded hybrids of minimal to full fertility; natural hybrids also have been documented (J. Clausen 1951). All taxa in <i>Hemizonia</i> are self-incompatible. The name <i>H. congesta </i>subsp.<i> congesta</i> has been sometimes misapplied to plants treated here as <i>H. congesta </i>subsp.<i> lutescens</i>; the type of <i>H. congesta</i> corresponds to plants that have been called H. leucocephala, a synonym of <i>H. congesta </i>subsp.<i> congesta</i> (B. G. Baldwin et al. 2001).</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Hemizonia
|author=Bruce G. Baldwin;John L. Strother
|authority=de Candolle in A. P. de Candolle and A. L. P. P. de Candolle
|rank=genus
|parent rank=subtribe
|synonyms=
|basionyms=
|family=Asteraceae
|illustrator=Marjorie C. Leggitt
|illustration copyright=Flora of North America Association
|distribution=w North America.
|reference=None
|publication title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr.
|publication year=1836
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V21_713.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae
|genus=Hemizonia
}}<!--

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