View source for Holozonia

{{Treatment/ID
|accepted_name=Holozonia
|accepted_authority=Greene
|publications={{Treatment/Publication
|title=Bull Torrey Bot. Club
|place=9: 122. 1882
|year=1882
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Madiinae;Holozonia
|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>[[Holozonia]]</div></div>
|etymology=Greek holos, whole or entire, and zona, belt or girdle; alluding to each phyllary fully (or mostly) investing a ray ovary (cypsela), in contrast to the half-invested cypselae of Hemizonia
|volume=Volume 21
|mention_page=page 255
|treatment_page=page 294
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials,</b> 30–150 cm (rhizomatous). <b>Stems</b> (aerial) ± erect. <b>Leaves</b> mostly cauline; proximal opposite (basally connate), distal alternate; sessile; blades lanceolate to linear, margins entire, faces hirsute and (distal leaves) glandular-hirtellous (glands cup-shaped). <b>Heads</b> radiate, borne singly or in loose, corymbiform arrays (peduncles filiform). <b>Peduncular</b> bracts: pit-glands, tack-glands, and/or spines 0. <b>Involucres</b> ± obconic or turbinate, 2–4+ mm diam. <b>Receptacles</b> flat to convex, glabrous or setulose, paleate (paleae falling, in 1 series between rays and discs, connate). <b>Phyllaries</b> 4–10 in 1 series (each mostly or wholly enveloping a ray ovary, ± lance-linear, herbaceous, abaxially hirsute, sometimes glandular-hirtellous, glands cup-shaped). <b>Ray</b> florets 4–10, pistillate, fertile; corollas whitish (abaxially purplish-veined). <b>Disc</b> florets 9–28, functionally staminate; corollas white (pubescent), tubes shorter than funnelform throats, lobes 5, deltate (anthers ± dark purple; styles glabrous proximal to branches). <b>Cypselae</b> (black) obcompressed, ± clavate (basal attachments centered, apices beakless, areolae broadly cupulate, faces glabrous); pappi (rays) 0 or coroniform (0.1–0.3 mm), or (discs) 0 or (readily falling) of 1–5 subulate scales. <b>x</b> = 14.</span><!--

-->{{Treatment/Body
|distribution=Calif.
|discussion=<p>Species 1.</p><!--
--><p><i>Holozonia</i> has been treated as congeneric with <i>Hemizonia</i> and with <i>Lagophylla</i>. Like <i>Lagophylla</i>, <i>Holozonia</i> has functionally staminate disc florets, cup-shaped glands, and obcompressed cypselae, each completely or mostly invested by a phyllary. Additional morphologic considerations and biosystematic studies led W. C. Thompson (1983) to reject the hypothesis of a close relationship between <i>Holozonia</i> and <i>Lagophylla</i>. Molecular phylogenetic data are in keeping with a closer relationship of <i>Holozonia</i> to other continental tarweeds with white corollas and x = 14 (i.e., <i>Blepharizonia</i> and <i>Hemizonia</i>), than to <i>Lagophylla</i> (S. Carlquist et al. 2003).</p>
|tables=
|references={{Treatment/Reference
|id=thompson1983a
|text=Thompson, W. C. 1983. A Biosystematic Study of Lagophylla (Compositae: Heliantheae) and Related Taxa. Ph.D. dissertation. University of California, Davis.
}}
}}<!--

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-->{{#Taxon:
name=Holozonia
|author=Bruce G. Baldwin;John L. Strother
|authority=Greene
|rank=genus
|parent rank=subtribe
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=Calif.
|reference=thompson1983a
|publication title=Bull Torrey Bot. Club
|publication year=1882
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V21_721.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Madiinae
|genus=Holozonia
}}<!--

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