| 词条 | Youngia japonica |
| 释义 |
| image = Youngia japonica Japan.jpg | image_caption = A small wild specimen of Y. japonica in Japan | genus = Youngia | species = japonica | authority = (L.) DC. }} Youngia japonica, commonly called Oriental false hawksbeard,[1] is a species of flowering plant in the aster family. Native to eastern Asia, it is now found as a weed nearly worldwide. DescriptionIt 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 cm to 150 cm 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 habitatYoungia japonica is native to eastern Asia in China and Japan.[2][3] 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.[4] 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 in areas such roadsides, cultivated fields, and in lawns.[4] In China, it is found in a variety of natural and disturbed habitats.[2] It is known to penetrate into intact natural communities as an invasive species in the United States.[5]TaxonomyThree subspecies are recognized. They are:[2]
It has been reported to form intergeneric hybrids with Lapsanastrum humile in Japan.[3] References1. ^{{PLANTS|id=YOJA|taxon=Youngia japonica|accessdate=8 January 2018}} {{Taxonbar|from=Q5704919}}2. ^1 2 3 Flora of China, Youngia japonica 3. ^1 {{cite book |last=Ohwi |first=Jisaburo |date=1965 |title=Flora of Japan |url= |location= |publisher=Smithsonian Institution |page=930 |isbn= |author-link= }} 4. ^1 2 Flora of North America, Youngia japonica 5. ^1 {{cite web |url=http://www.herbarium.unc.edu/flora.htm |title= Flora of the Southern and Mid-Atlantic States |author= Alan Weakley |date= 2015}} 6. ^{{BONAP|ref|genus=Youngia|species=japonica|accessdate=8 January 2018}} 1 : Youngia |
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