Castilla elastica Sesse, Moraceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  High risk, score: 9 (Go to the risk assessment)

Other Latin names:  Castilloa elastica Cerv.

Common name(s): [more details]

English: Central American rubbertree, Mexican rubber tree, Panama rubber tree, castilloa-rubber, uletree

Samoan: pulu mamoe

Spanish: árbol del ule, caucho, caucho negro, hule, ule

Habit:  tree

Description:  "Trees 5-10 m tall, the young branches densely hirsute with spreading (less frequently appressed) golden hairs, eventually glabrate.  Leaves oblong-obovate, more or less cordate and usually not strongly inequilateral at the base, subcuspidate-acuminate at the tip, 20-30 cm long, 10-14 cm broad, membranaceous, minutely and closely ciliate-dentate, both surfaces golden spreading-hirsute but particularly beneath, the petioles about 1 cm long; stipules 3-6 cm long.  Inflorescences in clusters of 2-4 in catenate series of the upper leaf-axils, occasionally solitary.  Staminate heads conduplicate-reniform, about 1.5 cm long and 2 cm broad, the peduncle about 1 cm long.  Fruiting heads thickly discoid, 4-5 cm in diameter, about 1.5 cm thick, sesile or subsessile, the component flowers half or more coherent, developing an orange or reddish pulp at maturity."  (Woodson and Schery, 1960; p. 180).

"A... tree ...reaching a height of 45 to 150 feet, noted for its abundant milky sap, which yields the Panama rubber of commerce.  It has spreading or drooping branches, the young ones woolly-hairy.  The leaves are coarse, densely hairy on both sides, short-stemmed, arranged in two rows, the blade oblong, broadest in the upper half, 8 to 18 by 3 to 6 inches, base heart-shaped, tip pointed, with about 18 pairs of prominent veins.  Inconspicuous female flowers in short-stemmed heads at leaf axils develop into fruit about 1.5 inches in diameter, consisting of a cluster of many red individuals about 0.75 inch long, with more or less sweet, edible pulp."  (Neal, 1965)

Habitat/ecology:  Moist forests at low elevations (Woodson and Schery, 1960; p. 180). In its native habitat, will become established in undisturbed rainforest, thus posing a threat to intact native forests.

Propagation:  Seeds spread by birds (Swarbrick, 1997; p. 24).

Native range:  Southern Mexico and Central America to Colombia and perhaps southward.

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
American Samoa Manu‘a Islands	Ta‘u Island		Togia, Tavita (year unknown)
American Samoa Manu‘a Islands	Ta‘u Island	introduced invasive	Whistler, W. A. (1984) (p. 103) "A small population at Fusi".
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1993) (voucher ID: PTBG 43385) Taxon name on voucher: Castilla elastica
American Samoa Tutuila Islands	Tutuila Island	introduced invasive	Space, James C./Flynn, Tim (2000) (pp. 4, 12) Voucher: Flynn 6550 (PTBG)
American Samoa Tutuila Islands	Tutuila Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1999) (voucher ID: PTBG 295) Taxon name on voucher: Castilla elastica Sesse
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Florence, J. (1997) (pp. 147-148)
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced cultivated	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Nuku Hiva (Nukahiva) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 8378 (PAP)
French Polynesia Society Islands	Moorea Island	introduced	Welsh, S. L. (1998) (p. 185) Voucher cited: Florence 5029
French Polynesia Society Islands	Moorea Island	introduced invasive	Florence, J. (1997) (pp. 147-148)
French Polynesia Society Islands	Moorea Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Vouchers cited: J. Florence 5029 (PAP), J. Florence 11853 (PAP) Naturalisée, menace pour la biodiversité.
French Polynesia Society Islands	Moorea Island		Bishop Museum (Honolulu) (1967) (voucher ID: BISH 22299) Taxon name on voucher: Castilla elastica Sesse
French Polynesia Society Islands	Moorea Island		Bishop Museum (Honolulu) (1983) (voucher ID: BISH 574260) Taxon name on voucher: Castilla elastica Sesse
French Polynesia Society Islands	Moorea Island		Bishop Museum (Honolulu) (1982) (voucher ID: BISH 607299) Taxon name on voucher: Castilla elastica Sesse
French Polynesia Society Islands	Moorea Island		Bishop Museum (Honolulu) (1993) (voucher ID: BISH 667932) Taxon name on voucher: Castilla elastica Sesse
French Polynesia Society Islands	Raiatea (Havai) Island	introduced	Welsh, S. L. (1998) (p. 185) Voucher cited: Moore 726
French Polynesia Society Islands	Raiatea (Havai) Island	introduced invasive	Florence, J. (1997) (pp. 147-148)
French Polynesia Society Islands	Tahiti Island	introduced invasive	Florence, J. (1997) (pp. 147-148)
State of Hawaii Hawaiian Islands	Hawaiian Islands		Neal, Marie C. (1965)
New Caledonia New Caledonia	New Caledonia Islands	introduced	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2013) Potentiellement envahissant.
Samoa Western Samoa Islands	Savai‘i Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 5)
Samoa Western Samoa Islands	Upolu Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 5) Voucher: Flynn 6934 (PTBG, SAMOA)
Samoa Western Samoa Islands	Upolu Island		Bishop Museum (Honolulu) (1968) (voucher ID: BISH 28828) Taxon name on voucher: Castilla elastica Sesse
Samoa Western Samoa Islands	Upolu Island		Bishop Museum (Honolulu) (1929) (voucher ID: BISH 161309) Taxon name on voucher: Castilla elastica Sesse
Samoa Western Samoa Islands	Upolu Island		Bishop Museum (Honolulu) (1979) (voucher ID: BISH 439270) Taxon name on voucher: Castilla elastica Sesse
Samoa Western Samoa Islands	Upolu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2002) (voucher ID: PTBG 329) Taxon name on voucher: Castilla elastica Sesse
Vanuatu New Hebrides Islands	Malakula (Malekula) Island		Bishop Museum (Honolulu) (1971) (voucher ID: BISH 406163) Taxon name on voucher: Castilla elastica Sesse
Vanuatu New Hebrides Islands	Vanuatu (Republic of)	introduced	Whistler, W. A. (1984) (p. 103) "Reported from Vanuatu".

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)	Queensland	introduced invasive cultivated	Csurhes, S./Edwards, R. (1998) (p. 99)
Central America Central America (Pacific rim)	Costa Rica (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	El Salvador (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Guatemala (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Honduras (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Nicaragua (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Central America Central America (Pacific rim)	Panama (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)
Singapore Singapore	Singapore (Republic of)	introduced invasive	Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 24) Casual
South America (Pacific rim) South America (Pacific rim)	Colombia	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
South America (Pacific rim) South America (Pacific rim)	Ecuador (Republic of) (continental)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Australia (Indian Ocean offshore islands) Christmas Island Group	Christmas Island	introduced invasive cultivated	Swarbrick, J. T. (1997) (pp. 24, 108) From remnants from plantations.
French Territory of Mayotte Mayotte Islands	Mayotte Island	introduced invasive	Comité français de l'Union Internationale pour la Conservation de la Nature en France (2013) Foresterie. naturalisée

Comments:  Naturalized on the western end of Tutuila, American Samoa, near Maloata (also reported to be found near ‘Ili‘ili) (Space & Flynn, 2000). Very invasive and widespread on both Upolu and Savai‘i, Samoa (Space & Flynn, 2002).

Control: 

Chemical: "Pending the results of field trials seedlings and young trees should be basal bark sprayed with 10% Garlon 600 in diesel oil" (Swarbrick, 1997; p. 24).