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-d0_s0" data-properties="whole-organism atypical some measurement;whole-organism some measurement;whole-organism duration"><b>Perennials </b>[annuals], 10–40 [–80+] cm.</span> <span class="statement" id="st-d0_s1" data-properties="stem growth form;stem orientation"><b>Stems </b>procumbent to ascending.</span> <span class="statement" id="st-d0_s2" data-properties=""><b>Leaves </b>basal and/or cauline;</span> <span class="statement" id="st-d0_s3" data-properties="">opposite;</span> <span class="statement" id="st-d0_s4" data-properties="leaf position;leaf position;leaf arrangement;leaf architecture">petiolate [sessile];</span> <span class="statement" id="st-d0_s5" data-properties="blade shape;blade shape;blade shape;blade shape;blade shape;blade shape;blade shape;ultimate margin shape;face pubescence;face pubescence;face relief;face pubescence">blades deltate, lanceolate, lanceovate, or ovate, often pinnately or palmately lobed, ultimate margins coarsely toothed to subentire, faces glabrate, hirsute, scabrellous, or strigillose.</span> <span class="statement" id="st-d0_s6" data-properties="head architecture or arrangement;head arrangement"><b>Heads </b>radiate [discoid], borne singly [in ± cymiform arrays].</span> <span class="statement" id="st-d0_s7" data-properties="involucre shape;involucre diameter"><b>Involucres </b>cylindric to hemispheric, 4–8 mm diam.</span> <span class="statement" id="st-d0_s8" data-properties="phyllary duration;phyllary quantity;series quantity"><b>Phyllaries </b>persistent, 11–15+ in 2–3+ series (outer usually shorter, more herbaceous, the inner often scarious).</span> <span class="statement" id="st-d0_s9" data-properties="receptacle shape;receptacle architecture"><b>Receptacles </b>convex to conic, paleate (paleae ± persistent, lance-linear, scarious, weakly conduplicate, often apically toothed).</span> <span class="statement" id="st-d0_s10" data-properties="ray-floret atypical quantity;ray-floret atypical quantity;ray-floret quantity;ray-floret architecture;ray-floret reproduction"><b>Ray-</b>florets [0–] 3–8 [–13], pistillate, fertile;</span> <span class="statement" id="st-d0_s11" data-properties="corolla coloration">corollas pale-yellow [white or purplish].</span> <span class="statement" id="st-d0_s12" data-properties="disc-floret atypical quantity;disc-floret quantity;disc-floret reproduction;disc-floret reproduction"><b>Disc-</b>florets [20–] 40–80+, bisexual, fertile;</span> <span class="statement" id="st-d0_s13" data-properties="corolla coloration;tube height or length or size;throat shape;lobe quantity;lobe shape">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].</span> <span class="statement" id="st-d0_s14" data-properties="cypsela shape;cypsela shape;cypsela shape;cypsela shape;cypsela pubescence"><b>Cypselae </b>obconic to obpyramidal, 3-angled, 4-angled, or 5-angled, densely piloso-sericeous [glabrous, villous];</span> <span class="statement" id="st-d0_s15" data-properties="scale atypical quantity;scale atypical quantity;scale quantity;scale shape;scale shape">pappi [sometimes wanting in rays] persistent, of [10–] 20 [–40], plumose [ciliate], setiform scales.</span> <span class="statement" id="st-d0_s16" data-properties="pappus duration;x chromosome quantity">x = 10.</span><!--

-->{{Treatment/Body
|distribution=mostly tropical;mostly New World
|introduced=true
|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.
}}
}}<!--

--><!--

-->{{#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://bibilujan@bitbucket.org/aafc-mbb/fna-fine-grained-xml.git/src/84153f6d59a0a91d69695978a64cee7560374f8e/V19-20-21/V21_440.xml
|tribe=Asteraceae tribe Heliantheae
|subtribe=Asteraceae (tribe Heliantheae) subtribe Galinsoginae
|genus=Tridax
|blade shape=lobed;ovate;lanceovate;ovate;lanceovate;lanceolate;deltate
|corolla coloration=yellowish;pale-yellow
|cypsela pubescence=piloso-sericeous
|cypsela shape=obconic;obpyramidal 3-angled 4-angled or 5-angled
|disc-floret atypical quantity=20;40
|disc-floret quantity=40;80
|disc-floret reproduction=fertile;bisexual
|face pubescence=strigillose;hirsute;glabrate
|face relief=scabrellous
|head architecture or arrangement=radiate
|head arrangement=singly
|involucre diameter=4mm;8mm
|involucre shape=cylindric;hemispheric
|leaf architecture=petiolate
|leaf arrangement=opposite
|leaf position=cauline;basal
|lobe quantity=5
|lobe shape=deltate
|pappus duration=persistent
|phyllary duration=persistent
|phyllary quantity=11;15
|ray-floret architecture=pistillate
|ray-floret atypical quantity=8;13
|ray-floret quantity=3;8
|ray-floret reproduction=fertile
|receptacle architecture=paleate
|receptacle shape=convex;conic
|scale atypical quantity=20;40
|scale quantity=20
|scale shape=setiform;plumose
|series quantity=2;3
|stem growth form=procumbent
|stem orientation=ascending
|throat shape=cylindric
|tube height or length or size=shorter
|ultimate margin shape=coarsely toothed;subentire
|whole-organism atypical some measurement=40cm;80cm
|whole-organism duration=perennial
|whole-organism some measurement=10cm;40cm
|x chromosome quantity=10
}}<!--

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