Difference between revisions of "Youngia japonica"
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 194. 1838.
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|name=Prenanthes japonica | |name=Prenanthes japonica | ||
|authority=Linnaeus | |authority=Linnaeus | ||
| + | |rank=species | ||
|publication_title=Mant. Pl., | |publication_title=Mant. Pl., | ||
|publication_place=107. 1767 | |publication_place=107. 1767 | ||
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|name=Crepis japonica | |name=Crepis japonica | ||
|authority=(Linnaeus) Bentham | |authority=(Linnaeus) Bentham | ||
| + | |rank=species | ||
}} {{Treatment/ID/Synonym | }} {{Treatment/ID/Synonym | ||
|name=Youngia japonica subsp. elstonii | |name=Youngia japonica subsp. elstonii | ||
|authority=(Hochreutiner) Babcock & Stebbins | |authority=(Hochreutiner) Babcock & Stebbins | ||
| + | |rank=subspecies | ||
}} | }} | ||
|hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Youngia;Youngia japonica | |hierarchy=Asteraceae;Asteraceae tribe Cichorieae;Youngia;Youngia japonica | ||
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-->{{#Taxon: | -->{{#Taxon: | ||
name=Youngia japonica | name=Youngia japonica | ||
| − | |||
|authority=(Linneaus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle | |authority=(Linneaus) de Candolle in A. P. de Candolle and A. L. P. P. de Candolle | ||
|rank=species | |rank=species | ||
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|publication year=1838 | |publication year=1838 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/eaa6e58056e40c9ef614d8f47aea294977a1a5e9/coarse_grained_fna_xml/V19-20-21/V19_340.xml |
|tribe=Asteraceae tribe Cichorieae | |tribe=Asteraceae tribe Cichorieae | ||
|genus=Youngia | |genus=Youngia | ||
Revision as of 19:18, 16 December 2019
Stems terete, fistulose. Leaves: petioles 1–10 cm, glabrous, puberulent, or densely hairy (hairs often brownish, crinkled); blades 3–12(–25) × 2–4(–6) cm, lateral lobes 0–20, mostly gradually reduced proximally, terminal lobes elliptic, ovate, obovate, or oblong-truncate, larger than laterals, apices obtuse or acute. Peduncles 1–5(–15) mm. Phyllaries 3.5–6 mm, bases and midribs becoming ± spongy, abaxial faces glabrous, glabrate, or hairy (hairs appressed, shining). Florets: corollas mostly 4.5–6.5 mm; anthers dark green (drying purplish); styles and style-branches yellow. Cypselae 1.5–2.5 mm, bases hollow, lightly calloused; pappi 2.5–3.5 mm, slightly surpassing phyllaries. 2n = 16.
Phenology: Flowering spring–summer (year-round south).
Habitat: Waste places, lawns, etc.
Elevation: 0–2400 m
Distribution
Ala., Ark., D.C., Fla., Ga., Ky., La., Md., Miss., N.Y., N.C., Pa., S.C., Tenn., Tex., Va., se Asia, introduced also in Mexico, Central America, South America, Europe, Africa, Pacific Islands, Australia.
Discussion
Youngia japonica is now considered a pantropical weed. Relatively few specimens in the flora match what Babcock and Stebbins called subsp. elstonii, with cauline leaves almost as large as the basal and with conspicuous, lobed bracts at the bases of the proximalmost branches of the capitulescence. In subsp. japonica, to which most of our specimens are referred, the cauline leaves are much reduced or lacking, as are the bracts of the capitulescence.
Selected References
None.