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 H. congesta subsp. calyculata). <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>Hemizonia as often circumscribed (to include Centromadia and Deinandra) is polyphyletic; molecular phylogenetic studies have indicated that Centromadia and Deinandra are more closely related to Calycadenia, Holocarpha, and Osmadenia than to Hemizonia in the strict sense, which is most closely related to Blepharizonia, also with 2n = 28 (S. Carlquist et al. 2003). Crosses between taxa of Hemizonia have yielded hybrids of minimal to full fertility; natural hybrids also have been documented (J. Clausen 1951). All taxa in Hemizonia are self-incompatible. The name H. congesta subsp. congesta has been sometimes misapplied to plants treated here as H. congesta subsp. lutescens; the type of H. congesta corresponds to plants that have been called H. leucocephala, a synonym of H. congesta subsp. congesta (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 |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://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/9216fc802291cd3df363fd52122300479582ede7/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.