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Oriental False Hawksbeard

Youngia japonica (L.) DC.

Comments

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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.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 19: 256 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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eFloras.org
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Description

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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.
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 19: 256 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
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eFloras

Distribution

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W. Pakistan, Himalaya (Kumaun to Bhutan), India, Ceylon, China, Japan, Indo-China, Philippines, Malaysia, Hawaii; widely introduced throughout the tropics.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Annotated Checklist of the Flowering Plants of Nepal Vol. 0 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Annotated Checklist of the Flowering Plants of Nepal @ eFloras.org
author
K.K. Shrestha, J.R. Press and D.A. Sutton
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eFloras.org
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Elevation Range

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230-2900 m
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Annotated Checklist of the Flowering Plants of Nepal Vol. 0 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Annotated Checklist of the Flowering Plants of Nepal @ eFloras.org
author
K.K. Shrestha, J.R. Press and D.A. Sutton
project
eFloras.org
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eFloras

Synonym

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Prenanthes japonica Linnaeus, Mant. Pl., 107. 1767; Crepis japonica (Linnaeus) Bentham; Youngia japonica subsp. elstonii (Hochreutiner) Babcock & Stebbins
license
cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 19: 256 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Youngia japonica

provided by wikipedia EN

Youngia japonica, commonly called Oriental false hawksbeard,[1] is a species of flowering plant in the family Asteraceae. Native to eastern Asia, it is now found as a weed nearly worldwide.

Description

It is an annual that produces yellow flowers. In tropical areas, it can bloom year round, while in temperate areas it blooms in late spring and early summer.[2] Plants are variable in height, ranging from 10 to 150 cm (4 to 59 in) depending on growing conditions. Stems are usually solitary and erect. Basal leaves are large a pinnately divided. Its fruits are wind dispersed.[3]

Distribution and habitat

Youngia japonica is native to eastern Asia in China and Japan.[3][4] However, it has been spread far from its initial range, and is now found as a non-native species nearly worldwide. It is present in Africa, Australia, Europe, North America, and South America.[2] In the United States, it is spreading rapidly, although it is largely restricted to areas in the Southeast.[5][6] It grows well in response to human disturbance, and is found in areas such roadsides, cultivated fields and in lawns.[2] In China, it is found in a variety of natural and disturbed habitats.[3] It is known to penetrate into intact natural communities as an invasive species in the United States.[5]

Taxonomy

Three subspecies are recognized. They are:[3]

  • Youngia japonica subsp. elstonii - With many stem leaves. Not known to be weedy.
  • Youngia japonica subsp. japonica - With few to no stem leaves. A weed found nearly worldwide.
  • Youngia japonica subsp. longiflora - Has larger flowers. Not known to be weedy. This is considered the most distinct subspecies.

It has been reported to form intergeneric hybrids with Lapsanastrum humile in Japan.[4]

References

  1. ^ USDA, NRCS (n.d.). "Youngia japonica". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 8 January 2018.
  2. ^ a b c Flora of North America, Youngia japonica
  3. ^ a b c d Flora of China, Youngia japonica
  4. ^ a b Ohwi, Jisaburo (1965). Flora of Japan. Washington: Smithsonian Institution. p. 930. doi:10.5962/bhl.title.43786. LCCN 65062683. OCLC 182709297.
  5. ^ a b Alan Weakley (2015). "Flora of the Southern and Mid-Atlantic States".
  6. ^ "Youngia japonica". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014. Retrieved 8 January 2018.
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Youngia japonica: Brief Summary

provided by wikipedia EN

Youngia japonica, commonly called Oriental false hawksbeard, is a species of flowering plant in the family Asteraceae. Native to eastern Asia, it is now found as a weed nearly worldwide.

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Wikipedia authors and editors
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wikipedia EN