Pacific Island Ecosystems at Risk (PIER)

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Commelina communis
L., Commelinaceae
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Present on Pacific Islands?  no

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 21 (Go to the risk assessment)

Common name(s): [more details]

Chinese: ya zhi cao

English: Asiatic dayflower, common dayflower

French: comméline commune

Habit:  herb

Description:  "Herbs annual. Stems creeping, diffuse, numerous branched, to more than 1 m, glabrous proximally, puberulent distally. Leaf sheaths glabrous; leaf blade lanceolate to ovate-lanceolate, 3-9 x 1.5-2 cm, glabrous. Involucral bracts borne opposite leaves, with 1.5-4 cm long stalk, cordate, folded, 1.2-2.5 cm, often hirsute-ciliate, apex acute. Proximal branch of cincinni with peduncle ca. 8 mm and 1 or 2 male flowers, distal branch with short peduncle and 3 or 4 bisexual flowers, nearly included in involucral bracts; pedicels ca. 3 mm at anthesis, curved and less than 6 mm in fruit. Sepals ca. 5 mm, membranous. Petals dark blue, 9-10 mm except proximal one ca. 5 mm. Capsule ellipsoid, 5-7 mm, 2-valved. Seeds 2 per valve, brown-yellow, semiellipsoid, 2-3 mm, flat on 1 surface, irregularly pitted, truncate at 1 end"  (Flora of China online).

Habitat/ecology:  In North America, "weedy and waste places; edges of fields, woods, and marshes, often in thick herbaceous vegetation; occasionally in woods"  (Flora of North America online).

Propagation:  Seed

Native range:  Georgia, the Russian far east, China, Taiwan, Korea, Japan; cultivated and naturalized elsewhere (GRIN).

Presence:

Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
China
China
China (People's Republic of) native
Zhengyi, Wu/Raven, Peter H./Deyuan, Hong (2013)
Japan
Japan
Japan (country) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Hokkaido, Honshu, Kyushu, Shikoku
North Korea
North Korea
North Korea (Democratic People's Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
South Korea
South Korea
South Korea (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Taiwan
Taiwan Island
Taiwan Island native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Oregon) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (west coast)
United States (west coast states)
USA (Washington) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Also reported from
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Canada (except British Colombia)
Canada
Canada (country) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
Ontario, Quebec
United States (continental except west coast)
United States (other states)
United States (other states) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast)
United States (other states)
USA (Florida) introduced
U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)

Control: 

Chemical:  See fact sheet from Purdue University for information on control.


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 26 DEC 2011 and was last updated on 29 DEC 2011.