View source for Tridax

{{Treatment/ID
|accepted_name=Tridax
|accepted_authority=Linnaeus
|publications={{Treatment/Publication
|title=Sp. Pl.
|place=2: 900. 1753
|year=1753
}}{{Treatment/Publication
|title=Gen. Pl. ed.
|place=5, 382. 1754
|year=1754
}}
|basionyms=
|synonyms=
|hierarchy=Asteraceae;Asteraceae tribe Heliantheae;Asteraceae (tribe Heliantheae) subtribe Galinsoginae;Tridax
|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 Galinsoginae]]</div><div class="higher-taxon"><small>genus</small>[[Tridax]]</div></div>
|etymology=Etymology recondite; perhaps alluding to 3-lobed leaf blades characteristic of original species
|volume=Volume 21
|mention_page=page 176, 177
|treatment_page=page 179
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Perennials </b>[annuals], 10–40[–80+] cm. <b>Stems</b> procumbent to ascending. <b>Leaves</b> basal and/or cauline; opposite; petiolate [sessile]; blades deltate, lanceolate, lance-ovate, or ovate, often pinnately or palmately lobed, ultimate margins coarsely toothed to subentire, faces glabrate, hirsute, scabrellous, or strigillose. <b>Heads</b> radiate [discoid], borne singly [in ± cymiform arrays]. <b>Involucres</b> cylindric to hemispheric, 4–8 mm diam. <b>Phyllaries</b> persistent, 11–15+ in 2–3+ series (outer usually shorter, more herbaceous, the inner often scarious). <b>Receptacles</b> convex to conic, paleate (paleae ± persistent, lance-linear, scarious, weakly conduplicate, often apically toothed). <b>Ray</b> florets [0–]3–8[–13], pistillate, fertile; corollas pale yellow [white or purplish]. <b>Disc</b> florets [20–]40–80+, bisexual, fertile; corollas yellowish [whitish or purplish], tubes shorter than cylindric or funnelform throats, lobes 5, usually deltate [sometimes rays 0 and corollas of peripheral florets ± bilabiate]. <b>Cypselae</b> obconic to obpyramidal, 3-, 4-, or 5-angled, densely piloso-sericeous [glabrous, villous]; pappi [sometimes wanting in rays] persistent, of [10–]20[–40], plumose [ciliate], setiform scales. <b>x</b> = 10.</span><!--

-->{{Treatment/Body
|distribution=mostly tropical;mostly New World.
|discussion=<p>Species ca. 26 (1 in the flora).</p>
|tables=
|references={{Treatment/Reference
|id=powell1965a
|text=Powell, A. M. 1965. Taxonomy of Tridax (Compositae). Brittonia 17: 47–96.
}}
}}<!--

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-->{{#Taxon:
name=Tridax
|author=John L. Strother
|authority=Linnaeus
|rank=genus
|parent rank=subtribe
|synonyms=
|basionyms=
|family=Asteraceae
|distribution=mostly tropical;mostly New World.
|introduced=true
|reference=powell1965a
|publication title=Sp. Pl.;Gen. Pl. ed.
|publication year=1753;1754
|special status=
|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V21_440.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Galinsoginae
|genus=Tridax
}}<!--

-->[[Category:Treatment]][[Category:Asteraceae (tribe Heliantheae) subtribe Galinsoginae]]