View source for Dodecahema

{{Treatment/ID
|accepted_name=Dodecahema
|accepted_authority=Reveal & Hardham
|publications={{Treatment/Publication
|title=Phytologia
|place=66: 86. 1989
|year=1989
}}
|common_names=Spinyherb
|basionyms={{Treatment/ID/Basionym
|name=Centrostegia sect. Diplostegia
|authority=Roberty & Vautier
|rank=section
|publication_title=Boissiera
|publication_place=10: 91. 1964
}}
|synonyms=
|hierarchy=Polygonaceae;Polygonaceae subfam. Eriogonoideae;Dodecahema
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Polygonaceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Polygonaceae subfam. Eriogonoideae]]</div><div class="higher-taxon"><small>genus</small>[[Dodecahema]]</div></div>
|etymology=Greek dodeka, twelve, and hema, dart or javelin, alluding to involucral awns
|volume=Volume 5
|mention_page=page 220, 446
|treatment_page=page 474
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs,</b> annual; taproot slender. <b>Stems</b> arising directly from the root, spreading, solid, not fistulose or disarticulating into ringlike segments, sparsely glandular. <b>Leaves</b> usually quickly deciduous, basal, rosulate; petiole present; blade narrowly oblanceolate, margins entire. <b>Inflorescences</b> terminal, cymose, uniparous due to suppression of secondaries; branches dichotomous, not brittle or disarticulating into segments, round, sparsely glandular; bracts 3–4, positioned to side and opposite next distal subsequent branch or involucre, connate ca. 1/2 their length, lanceolate, awned, sparsely glandular. <b>Peduncles</b> spreading, peglike. <b>Involucres</b> 1 per node, tubular, cylindric, 6-angled; teeth 6, awn-tipped, awns uncinate. <b>Flowers</b> 3 per involucre; perianth white to pink, campanulate when open, cylindric when closed, pubescent abaxially; tepals 6, connate proximally, monomorphic, entire apically; stamens 9; filaments free, glabrous; anthers red to maroon, oblong. <b>Achenes</b> included, dark brown to black, not winged, 3-gonous, glabrous. <b>Seeds</b>: embryo curved. <b>x</b> = ca. 17.</span><!--

-->{{Treatment/Body
|distribution=Calif.
|discussion=<p>Species 1.</p><!--
--><p>Each of the 12 awns on each involucre of <i>Dodecahema leptoceras</i> is long and slender. They are more like those seen in <i>Sidotheca</i> (Eriogonineae) than those of any member of the Chorizanthineae. J. L. Reveal and C. B. Hardham (1989) reported a consistent chromosome count of n = 15 plus (seemingly) additional chromosome fragments that bring the number to approximately n = 17. More work is required to resolve the exact chromosome number for the species. A specimen (Meiere s.n., 4 May 1917, CAS) supposedly from Needles, San Bernardino County, is discounted.</p>
|tables=
|references=
}}<!--

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-->{{#Taxon:
name=Dodecahema
|author=James L. Reveal
|authority=Reveal & Hardham
|rank=genus
|parent rank=subfamily
|synonyms=
|basionyms=Centrostegia sect. Diplostegia
|family=Polygonaceae
|distribution=Calif.
|reference=None
|publication title=Phytologia
|publication year=1989
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V5/V5_995.xml
|subfamily=Polygonaceae subfam. Eriogonoideae
|genus=Dodecahema
}}<!--

-->[[Category:Treatment]][[Category:Polygonaceae subfam. Eriogonoideae]]