Pacific Island Ecosystems at Risk (PIER)

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Roldana petasitis
(Sims) R. & B., Asteraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 12 (Go to the risk assessment)

Other Latin names:  Cineraria petasitis Sims; Senecio petasitis (Sims) DC.

Common name(s): [more details]

English: California-geranium, velvet groundsel

Habit:  shrub

Description:  "Bushy shrub to 3 m tall, pilose throughout. Leaves with petiole 7-14 cm long; lamina almost circular in outline, 6-14 cm long, 7-15 cm broad, ± cordate to truncate at base, with 9-11 shallow, somewhat triangular lobes and small, hard denticulations, palmately veined, scattered strigulose above, pale crisped-pubescent below. Capitula cylindrical, in large, compound, cymose panicles, with reduced, sessile leaf-like bracts; involucral bracts 8, narrowly lanceolate, 8-10 mm long, shortly pubescent. Outer florets 5 or 6, ligulate, 6-8 mm long, yellow; disc florets c. 15, 7-8 mm long, narrowly funnel-shaped in upper half. Cypselas narrowly cylindrical, 3-4 mm long, striate, with a narrow apical rim, glabrous; pappus hairs 6-7 mm long"  (Flora of Australia online).

Habitat/ecology:  (no habitat/ecology info known by PIER)

Propagation:  Seed

Native range:  Southern Mexico, El Salvador, Guatemala, Honduras, Nicaragua (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia (Pacific offshore islands)
Lord Howe Island
Lord Howe Island introduced
invasive
cultivated
Australian Biological Resources Study (2013)
Vouchers cited: R.O. Belcher 2673 (EMC), J. Pickard in A.N. Rodd 1402 (NSW), A.C. Beauglehole 5666 (CANB, MEL).
A naturalised garden escape.
State of Hawaii
Hawaiian Islands
O‘ahu Island   National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1986) (voucher ID: PTBG 1705)
Taxon name on voucher: Roldana petasitis (Sims) R. & B.
State of Hawaii
Hawaiian Islands
O‘ahu Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (1986) (voucher ID: BISH 539937)
Taxon name on voucher: Roldana petasitis (Sims) R. & B.
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Australia
Australia (continental)
New South Wales introduced
invasive
cultivated
National Herbarium of New South Wales (2013)
Cultivated as an ornamental, occasionally naturalized.
Australia
Australia (continental)
Queensland introduced
National Herbarium of New South Wales (2013)
El Salvador
El Salvador
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)


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This page was created on 1 JUN 2011 and was last updated on 1 AUG 2011.