Flora of North America species comparison

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Youngia japonica

oriental false hawksbeard
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.
Florets

corollas mostly 4.5–6.5 mm;

anthers dark green (drying purplish);

styles and style-branches yellow.
Phyllaries

3.5–6 mm, bases and midribs becoming ± spongy, abaxial faces glabrous, glabrate, or hairy (hairs appressed, shining).
Cypselae

1.5–2.5 mm, bases hollow, lightly calloused;

pappi 2.5–3.5 mm, slightly surpassing phyllaries.
2n

= 16.

Youngia japonica
Phenology Flowering spring–summer (year-round south).
Habitat Waste places, lawns, etc.
Elevation 0–2400 m (0–7900 ft)
Distribution
from FNA
AL; AR; DC; FL; GA; KY; LA; MD; MS; NC; NY; PA; SC; TN; TX; VA; se Asia [Introduced in North America; introduced also in Mexico, Central America, South America, Europe, Africa, Pacific Islands, Australia]
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 256.
Parent taxa Asteraceae > tribe Cichorieae > Youngia
Synonyms Prenanthes japonica, Crepis japonica, Y. japonica subsp. elstonii
Name authority (Linneaus) de Candolle: in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 7: 194. (1838)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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