Difference between revisions of "Tridax"

Linnaeus

Sp. Pl. 2: 900. 1753

,

Gen. Pl. ed. 5, 382. 1754

Etymology: Etymology recondite perhaps alluding to 3-lobed leaf blades characteristic of original species
Treatment appears in FNA Volume 21. Treatment on page 179. Mentioned on page 176, 177.
 
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|publication year=1753;1754
 
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|special status=
 
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/8f726806613d60c220dc4493de13607dd3150896/coarse_grained_fna_xml/V19-20-21/V21_440.xml
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|source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f50eec43f223ca0e34566be0b046453a0960e173/coarse_grained_fna_xml/V19-20-21/V21_440.xml
 
|tribe=Asteraceae tribe Heliantheae
 
|tribe=Asteraceae tribe Heliantheae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Galinsoginae
 
|subtribe=Asteraceae (tribe Heliantheae) subtribe Galinsoginae

Latest revision as of 20:37, 16 December 2019

Perennials [annuals], 10–40[–80+] cm. Stems procumbent to ascending. Leaves 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. Heads radiate [discoid], borne singly [in ± cymiform arrays]. Involucres cylindric to hemispheric, 4–8 mm diam. Phyllaries persistent, 11–15+ in 2–3+ series (outer usually shorter, more herbaceous, the inner often scarious). Receptacles convex to conic, paleate (paleae ± persistent, lance-linear, scarious, weakly conduplicate, often apically toothed). Ray florets [0–]3–8[–13], pistillate, fertile; corollas pale yellow [white or purplish]. Disc 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]. Cypselae 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. x = 10.

Distribution

mostly tropical, mostly New World.

Discussion

Species ca. 26 (1 in the flora).

Lower Taxa