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Ageratum conyzoides

Billygoat Weed

Multimedia & Additional Resources

Type	Description	Download
Image:	Plant and details of flowers and seed-head	46KB
Image:	Flowers and leaves	47KB

General Information

COMMON NAMES: Billygoat Weed, Ageratum, Goat Weed

GLOBAL DISTRIBUTION: NATIVE Mexico - Caribbean - S.America

COOK ISLANDS STATUS: Introduced - Recent, Naturalised; Land, lowlands - mountains (++++)

SIGNIFICANCE LIST: ; Weed - moderate

KEY FEATURES: Erect herb to 1m. LEAVES opposite, ovate, to 10x5cm; base rounded, tip sharp, with large teeth, hairy both sides; stalk 1-5cm. FLOWERS compound, several in erect clusters; each bluish-purple or white with ~75 florets, with styles protruding; seeds (=achenes) 1-2mm, smooth.

Cook Islands Distribution

View Distribution Map

Southern Group: Present Makatea: Present
RR	MG	AT	MK	MT	AK	PL	TK	MN
	++++			P		P		-

Northern Group: Present
TN	MH	RK	PK	NS	SW
-	-	-	-	-	-

Key to Symbols

blank	no data
-	absent	L	localised
X	extinct 'naturally'	W	widespread
XQi	quarantine intercepted	R	recent
XQe	eradicated	?	query preceding category
P	present	T?	taxonomic query
S	seasonal	nn	present, said to have no name
O	occasional	?1	present, name not investigated
++++	very common	?2	presence not verified, no name recorded
+++	common	N/A	absent, name not expected
++	uncommon
+	rare
Cook Islands islands: RR =Rarotonga, MG = Mangaia, AT =‘Ātiu, MK=Ma‘uke, MT=Miti‘āro, AK=Aitutaki, PL=Palmerston, PN=Penrhyn, MN=Manuae, TK=Takūtea, TN=Tongareva (TS=Tongaleva Spoken, TW=Tongareva Written, they say "el" but write "r"), MH=Manihiki, RK=Rakahanga, PK=Pukapuka, NS=Nassau, SW=Suwarrow. After a Polynesian name: ^=orthography query. Countries and other: FIJ=Fiji, WT=Wallis & Futuna, SAM=Samoa, TON=Tonga, NIU=Niue, CK=Cook Islands, CKM=Cook Islands Māori, FP=French Polynesia, AUS=Australs, SOC=Societies, TAH=Tahiti, TUA=Tuamotus, MQS=Marquesas, MNG=Mangareva, PIT=Pitcain group, EAS=Easter Island, HAW=Hawai‘i, NZ=New Zealand, NZM=New Zealand Māori

Scientific Taxonomy

Ageratum conyzoides Linnaeus
TAXONOMY: PLANTAE; ANTHOPHYTA (=Angiospermae); MAGNOLIOPSIDA (=Dicotyledones); ASTERIDAE; Asterales; ASTERACEAE

Vouchers & References

Vouchers:
None Recorded.

References:
p.255 Wagner et al.- Flowering Plants of Hawaii
p.830 Neal - In Gardens of Hawaii
p.37 Royal Hort. Soc. Index of Garden Plants
p.5/296 A.C.Smith - Flora Vitiensis Nova
p.284 I Cheeseman - Flora of Rarotonga
p.104 Wilder - Flora of Rarotonga
p.417 Whistler - Ethnobotany of the Cook Islands

Data Update History (information):
zTX, zB02, zM02, zupM05a

Web Resources

Citation Information

McCormack, Gerald (2007) Cook Islands Biodiversity Database, Version 2007.2. Cook Islands Natural Heritage Trust, Rarotonga. Online at http://cookislands.bishopmuseum.org.
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