Compilation
Prenanthes japonica

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Name

Identification
Prenanthes japonica L. [family ASTERACEAE ] (stored under name); Verified by Not on sheet, Youngia japonica (L.) DC. [family ASTERACEAE ] Verified by Not on sheet,
Related name
  • Prenanthes japonica
  • Youngia japonica
Common name
  • Oriental false hawksbeard, Flora of North America Vol. 19

Flora

Entry for Youngia japonica (Linneaus) de Candolle [family COMPOSITAE]
Herbarium
Flora of North America (FNA)
Collection
Flora of North America
Resource Type
Reference Sources
Entry From
Flora of North America, Vol 19,
Names
Youngia japonica (Linneaus) de Candolle [family COMPOSITAE], in A. P. de Candolle and A. L. P. P. de Candolle, Prodr., 7: 194. 1838
Prenanthes japonica Linnaeus [family COMPOSITAE], Mant. Pl., 107. 1767
Crepis japonica (Linnaeus) Bentham [family COMPOSITAE]
Youngia japonica subsp. elstonii (Hochreutiner) Babcock & Stebbins [family COMPOSITAE]
Treatment Author(s)
Phyllis L. Spurr
Information
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
mar-may (spring), jun-aug (summer)
Altitude range
0–2400 m;
Distribution
se Asiaintroduced also in MexicoCentral AmericaSouth AmericaEuropeAfricaPacific IslandsAustralia.USA Ala.USA Ark.USA D.C.USA Fla.USA Ga.USA Ky.USA La.USA Md.USA Miss.USA N.Y.USA N.C.USA Pa.USA S.C.USA Tenn.USA Tex.USA Va.
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.
Native/Introduced
introduced;

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