View source for Hemizonia ← Hemizonia You do not have permission to edit this page, for the following reason: The action you have requested is limited to users in the group: Users. You can view and copy the source of this page. {{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={{Treatment/Reference |id=babcock1924a |text=Babcock, E. B. and H. M. Hall. 1924. Hemizonia congesta: A genetic, ecologic, and taxonomic study of the hay-field tarweeds. Univ. Calif. Publ. Bot. 13: 15–100. }} }}<!-- --><!-- -->{{#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=babcock1924a |publication title=in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. |publication year=1836 |special status= |source xml=https://bibilujan@bitbucket.org/aafc-mbb/fna-data-curation.git/src/bb6b7e3a7de7d3b7888a1ad48c7fd8f5c722d8d6/coarse_grained_fna_xml/V19-20-21/V21_713.xml |tribe=Asteraceae tribe Heliantheae |subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae |genus=Hemizonia }}<!-- -->[[Category:Treatment]][[Category:Asteraceae (tribe Heliantheae) subtribe Madiinae]] Templates used on this page: Template:Asteraceae (view source) Template:Treatment/AuthorLink (view source) Template:Treatment/Body (view source) Template:Treatment/Body/Maps (view source) Template:Treatment/ID (view source) Template:Treatment/Publication (view source) Template:Treatment/Reference (view source) Return to Hemizonia.