Dyssodia tenuiloba (DC.) B.L.Robinson, Asteraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Hymenatherum tenuilobum DC.; Thymophylla tenuiloba (DC.) Small

Common name(s): [more details]

English: Dahlberg daisy, Dahlberg's daisy, bristleleaf pricklyleaf, golden fleece

Habit:  herb

Description:  "A trailing annual 12-16 inches long and half as tall, Dahlberg daisy emits a resinous-aromatic odor when handled.  It has leaves pinnately divided into 7-11 linear, entire lobes, oppositely arranged at the base of the plant but alternate higher along the stem. The stalked, yellow, radiate flower heads are about 0.5 inches in diameter, with a cuplike involucre (the involucral bracts fused 3/4 their length) that sheds cylindrical fruit about 0.15 inches long, each bearing a pappus of about 10 scales and 3 bristles"  (Staples & Herbst, 2005; p. 168).

Habitat/ecology:  "Thrives in sunny, dry spots on sandy, well-drained soil  (Staples & Herbst, 2005; p. 168).

Propagation:  Seed

Native range:  Southern Texas and adjacent Mexico  (Staples & Herbst, 2005; p. 168).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
State of Hawaii Hawaiian Islands	Kaho‘olawe Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2006) (p. 32) Vouchers cited: Starr, Starr, Higashino &am p; Abbott 040330-1(BISH), Starr, Starr, Higashino & Brunch 040607-2 (BISH)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Lorence, David H./Flynn, Tim (2006) (p. 2) Voucher cited: E. Pickup s.n. (BISH, NY, PTBG, US)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive cultivated	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2010) (p. 62) Voucher cited: Starr & Starr 070402-01 (BISH)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Starr, Forest/Martz, Kim/Loope, Lloyd L. (2002) (p. 18) Vouchers cited: West Maui: Starr & Martz 000426-1 (BISH); East Maui: Starr & Martz 000126-1 (BISH)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2006) (p. 32) Voucher cited: Starr & Starr 050517-14 (BISH)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Starr, Forest/Martz, Kim/Loope, Lloyd L. (2002) (p. 18) Voucher cited: B.H. Gagne 3150 (BISH)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Mexico Mexico	Mexico (United Mexican States)	native	Staples, George W./Herbst, Derral R. (2005) (p. 168)

Also reported from
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
United States (continental except west coast) United States (other states)	United States (other states)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Alabama, Louisiana, Mississippi Naturalized
United States (continental except west coast) United States (other states)	United States (other states)	native	Staples, George W./Herbst, Derral R. (2005) (p. 168) Southern Texas.
United States (continental except west coast) United States (other states)	USA (Florida)	native	U.S. Dept. Agr., Nat. Res. Cons. Serv. (2013)
United States (continental except west coast) United States (other states)	USA (Florida)	introduced invasive	U.S. Dept. Agr., Agr. Res. Serv. (2013) Naturalized
United States (continental except west coast) United States (other states)	USA (Florida)	introduced invasive cultivated	Staples, George W./Herbst, Derral R. (2005) (p. 168)

Control:  If you know of control methods for Dyssodia tenuiloba, please let us know.