Wildflowers forum: Youngia genus

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South Texas (Zone 9a)
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Justin
Feb 17, 2014 10:56 AM CST
Youngia is a genus native in Asia. It belong toAsteraceae family (Compositae family), in Cichorieae tribe.
Description on "Flora of China":
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=1...
USDA plants mentions two species naturalized in North America
http://plants.usda.gov/java/ClassificationServlet?source=dis...
Youngia japonica (Oriental False Hawksbeard) and Youngia thunbergiana (Tall False Hawksbeard).
I don't know why Youngia thunbergiana does not appear in "Flora of China".

Y.thunbergiana was considered synonym for Y. japonica subsp. elstonii, but recent studies have shown that it is a distinct species. ("Youngia thunbergiana (Crepidinae, Cichorieae, Asteraceae), a Species Overlooked in the North American Flora" - Lowell E. Urbatsch, John F. Pruski, and Kurt M. Neubig. See, abstract of article, here: http://www.bioone.org/doi/abs/10.2179/13-018 on BioOne Online Journals)

I don't know what are the differences between these two species. I think it would be interesting to see comparative pictures.
USDA distribution for Y. japonica:
http://plants.usda.gov/core/profile?symbol=YOJA
and for Y.thunbergiana:
http://plants.usda.gov/core/profile?symbol=YOTH
And of course, if possible, photos and for other species of genus Youngia.

Thumb of 2014-02-17/Justin/60a2c7 Youngia japonica February 02, 2014, Victoria, Tx.


Justin
[Last edited by Justin - Feb 17, 2014 2:41 PM (+)]
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South Texas (Zone 9a)
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Justin
Feb 17, 2014 1:09 PM CST
Few pictures of different species of Youngia on "Chinese Virtual Herbarium"
http://www.cvh.org.cn/db/data_photos/data_index?id=1&page=18...
http://www.cvh.org.cn/db/data_photos/data_index?id=1&page=19...
http://www.cvh.org.cn/db/data_photos/data_index?id=1&page=20...
For convenience I wrote all 3 page links, containing photos of Youngia species.
On first link above, scroll down, at the bottom are shown photos of Youngia pseudosenecio. According to article quoted above, Youngia pseudosenecio is synonym of Youngia thunbergiana.

I do not know if it's helpful for those who may have I do not know if it's helpful for those who may have Youngia thunbergiana in their area, but I noticed in the third picture, which show flowers and leaf (Image 23 of 25 on page 18), pattern "like sharp spine" on tip of leaf undulations, longer and more sharp, comparing to what I so on leaf of Youngia japonica. But it's possible that I am wrong, so this is just an idea, I'm not sure if this is a distinction between species or not.

Justin
[Last edited by Justin - Feb 17, 2014 1:26 PM (+)]
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Justin
Feb 17, 2014 2:38 PM CST
[b]Youngia japonica[b] - Oriental False Hawksbeard

Native to eastern and southeastern Asia, the plant has become naturalized around the world in tropical and subtropical zones, so today it has a pantropical distribution and it is considered a cosmopolitan weed.
Description on eFloras.org:
http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=2...
http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=2...
Other useful links:
http://www.freshfromflorida.com/Divisions-Offices/Plant-Indu...
http://www.southeasternflora.com/view_flora.asp?plantid=529#
http://ocmga.org/uploads/WOTMJan13.pdf
And two interesting blog pages:
http://myfloridabackyard.blogspot.com/2011/02/brighten-corne...
http://rufino-osorio.blogspot.com/2010/09/youngia-japonica.h...
It seems that the plant is expanding.
---

Habit (Photos taken on February 02, 2014 - Victoria, Tx)
Thumb of 2014-02-17/Justin/a57527 Thumb of 2014-02-17/Justin/61f014 Thumb of 2014-02-17/Justin/e899a8 Thumb of 2014-02-17/Justin/249806
Plants have appeared spontaneously in the backyard in an poor lawns areas. It seems to prefer disturbed areas with sun in the morning and more shadow on afternoon. Frequent alongside or close to house wall. Probably for shadow and humidity.
Note the variability in the overall appearance of inflorescence between the first and the last picture above. Last has a very compact inflorescence.

Note: I try to ID the plants accurately. But anytime an mistake is possible. If so, the correction is more than welcome.

Justin
Name: josephine
Arlington, Texas (Zone 8a)
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frostweed
Feb 17, 2014 3:00 PM CST

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Thank you Justin, you are always so thorough Smiling
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Justin
Feb 17, 2014 8:33 PM CST
Thank you Josephine.
Every time when I trying to identify plants, I try to read as much I can, about them. In books or on the net. This it is useful to improve my English.
When I take photos to one plant, I try to get as much details. Unfortunately I don't always succeed as I wish.
Justin
South Texas (Zone 9a)
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Justin
Feb 17, 2014 9:30 PM CST
Few more details taken on various plants (February 02, 2014 - Victoria, Tx ).
Thumb of 2014-02-18/Justin/a3feb2 Thumb of 2014-02-18/Justin/449f30 Thumb of 2014-02-18/Justin/c4e32d Thumb of 2014-02-18/Justin/92ee1a Thumb of 2014-02-18/Justin/f16e74 Thumb of 2014-02-18/Justin/6d89ba Thumb of 2014-02-18/Justin/325fd2 Thumb of 2014-02-18/Justin/ffc445 Thumb of 2014-02-18/Justin/78f7b4 Thumb of 2014-02-18/Justin/535c5f Thumb of 2014-02-18/Justin/3f7e44

Justin
Name: Greene
Savannah, GA (Sunset 28) (Zone 8b)
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greene
Feb 17, 2014 10:58 PM CST
@Justin,
Thank you for the photos; they are excellent. If we have a 'Photography Forum' I would vote you to be in charge.
Many of us could use a little help to learn to achieve good photos of our plants.
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~~"Leaf of Faith"

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