Senna surattensis (Burm.f.) H.S.Irwin & Barneby, Fabaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Risk assessment results:  Evaluate, score: 0 (Go to the risk assessment)

Other Latin names:  Cassia surattensis N.L. Burm

Common name(s): [more details]

Chinese: huang huai jue ming

English: Singapore shower tree, glaucous cassia, scrambled eggs bush, sunshine tree

Hawaiian: kalamona, kolomona

Habit:  tree

Description:  "Small trees 3-6 m tall.  Leaves 8-18 cm long, leaflets 6-10 pairs, the distal cones larger and proportionately narrower, obovate to elliptic-ovate or oblanceolate, 2-5 cm long, 0.8-2 cm wide, upper surface green and usually glabrous, lower surface glaucous and sparsely appressed pubescent, especially along midrib, apex rounded, emarginate, base obliquely rounded or cuneate, clavate nectaries between the first, second, and sometimes third pairs of leaflets, stipules linear-subulate, 4.5-13 mm long, caducous.  Flowers in racemes 0.4-2.5 cm long, pedicels 15-25 mm long, bracts submembranous, ovate to lanceolate, 2-7 mm long, persistent until anthesis, then deciduous, the lowermost sometimes subtended by a clavate nectary; calyx lobes oblanceolate to oblong-obovate, the outermost 3-4.4 mm long, inner ones 5.5-8 mm long; petals bright yellow or yellowish orange, ovate to oblong-ovate, the longest one 16-24  mm long; fertile stamens 10, all nearly similar to one another, slightly increasing in size toward abaxial side of flower; filaments 9, 0.7-2 mm long, that of central abaxial stamen 1.5-3.5 mm long.  Pods pendulous, chartaceous, strongly compressed, 7-10 cm long, 1.1-1.5 cm wide, base constricted into a stipe 0.5-0.7 cm long, the cavity with narrow interseminal septa.  Seeds oriented transversely in 1 row, compressed parallel to the valves, pale brown, glossy, oblong-ellipsoid, 5-6 mm long, the areole 2.7-3.6 mm long"  (Wagner et al., 1999; p. 702-703).

"Distinguishable by the small tree habit, alternate, pinnately compound leaves, six to ten pairs of leaflets waxy white on the lower surface, five-parted yellow flowers iwth ten stamens, and strap-shaped pods.  A similar ornamental species, Senna siamea (Lamarck) Irwin & Barnaby, kassod tree, differs in having smaller flowers 9-16 mm long and larger fruits 18-30 cm long"  (Whistler, 2000; p. 417).

Habitat/ecology:  In Hawai‘i, "cultivated, now persisting and at least sparingly naturalized in low elevation, disturbed sites, 15-100 m" (Wagner et al., 1999; p. 702-703); "shades out forages in mesic pastures"  (Motooka et al., 2003).

Propagation:  Seed

Native range:  "Of obscure origin, thought to be native to Australia, but Symon (1966) states that it is probably an early introduction there; in India, Burma, Indochina and the Philippine Islands it is planted, sometimes escaping, and it is of uncertain status on the Caroline and Society Islands" (Wagner et al., 1999; p. 702-703).

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Tinian Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 99)
Commonwealth of the Northern Mariana Islands (US) Northern Mariana Islands	Tinian Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1946) (voucher ID: PTBG 22656) Taxon name on voucher: Senna surattensis
Cook Islands Southern Cook Islands	‘Atiu Island	introduced cultivated	McCormack, Gerald (2013)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 99)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced cultivated	Lorence, David H./Flynn, Timothy (2010) (p. 17)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced invasive	Josekutty, P. C./Wakuk, E. E./Joseph, M. J. (2002) (p. 63)
French Polynesia Gambier Islands	Mangareva (Gambier) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
French Polynesia Marquesas Islands	Fatu Hiva Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Hiva Oa Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island	introduced invasive	Lorence, David H./Wagner, Warren L. (2013)
French Polynesia Marquesas Islands	Ua Huka (Huahuna, Uahuka) Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2003) (voucher ID: PTBG 40840) Taxon name on voucher: Senna surattensis
French Polynesia Society Islands	Huahine Island		Fosberg, F. R. (1997) (p. 48)
French Polynesia Society Islands	Moorea Island	possibly native	Welsh, S. L. (1998) (p. 162) Voucher cited: Florence 4711
French Polynesia Society Islands	Moorea Island	possibly native cultivated	University of California (2006) "Grown ornamentally but possibly indigenous".
French Polynesia Society Islands	Moorea Island	introduced cultivated	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 4711 (PAP) Quelques pieds plantés au bord de la route.
French Polynesia Society Islands	Raiatea (Havai) Island	possibly native	Welsh, S. L. (1998) (p. 162) Vouchers cited: BRY 26578
French Polynesia Society Islands	Raiatea (Havai) Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
French Polynesia Society Islands	Taha‘a Island		Fosberg, F. R. (1997) (p. 48)
French Polynesia Society Islands	Taha‘a Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
French Polynesia Society Islands	Tahiti Island	possibly native	Welsh, S. L. (1998) (p. 162) Voucher cited: BRY 26309
French Polynesia Society Islands	Tahiti Island	introduced invasive cultivated	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Voucher cited: J. Florence 2395 (PAP) Ornementale communément planté le long des rues. Se naturalise.
French Polynesia Austral (Tubuai) Islands	Rurutu Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
French Polynesia Austral (Tubuai) Islands	Tubuai Island	introduced invasive	Florence, J./Chevillotte, H./Ollier, C./Meyer, J.-Y. (2013) Naturalisée
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 99)
State of Hawaii Hawaiian Islands	Kaua‘i Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 702-703)
State of Hawaii Hawaiian Islands	Lāna‘i Island	introduced invasive cultivated	Oppenheimer, Hank (2007) (p. 25) Voucher cited: Oppenheimer H120648 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 702-703)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Staples, George W./Imada, Clyde T./Herbst, Derral R. (2002) (p. 11) Vouchers cited: H. St. John & F.R. Fosberg 12831 (BISH), S. Ishikawa 139 (BISH), H. St. John et al. 12763 (BISH)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (pp. 702-703)
Marshall Islands Ratak Chain	Arno Atoll	introduced	Vander Velde, Nancy/Vander Velde, Brian (2007) (p. 8) "Rare; single tree found alongside road of Amata Kabua's".
Marshall Islands Ratak Chain	Majuro (Mãjro) Atoll	introduced cultivated	Vander Velde, Nancy (2003) (p. 80) Single planted tree.
New Caledonia Îles Loyauté (Loyalte Islands)	Île Tiga	introduced	MacKee, H. S. (1994) (p. 74) Voucher cited: MacKee 45923
New Caledonia New Caledonia Archipelago	Île Grande Terre	introduced	MacKee, H. S. (1994) (p. 74) Voucher cited: MacKee 21877
Palau Palau (Belau ) (main island group)	Babeldaob Island	introduced cultivated	Space, James C./Lorence, David H./LaRosa, Anne Marie (2009) (p. 5) Voucher: Lorence 9924 (PTBG, BNM, NY, US)
Palau Palau (Belau ) (main island group)	Babeldaob Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2008) (voucher ID: PTBG 217) Taxon name on voucher: Senna surattensis
Papua New Guinea Bismarck Archipelago	Bismarck Archipelago		Peekel, P. G. [translated by E. E. Henty] (1984) (p. 219) In secondary forest and gardens.
Philippines Philippine Islands	Philippine Islands	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Tonga Tonga Islands	Tonga Islands	introduced	ILDIS Co-ordinating Centre (2013)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island	introduced cultivated	Meyer, Jean-Yves (2007) (p. 35)

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)	Northern Territory	native	Australian Biological Resources Study (2013)
Australia Australia (continental)	Queensland	native	Australian Biological Resources Study (2013)
China China	Hong Kong	introduced cultivated	Wu, Te-lin (2001) (p. 136) As Cassia surattensis Burm. f. Hedges, ornamental.
Indonesia Indonesia	Indonesia (Republic of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Japan Ryukyu Islands	Ryukyu Islands	introduced	ILDIS Co-ordinating Centre (2013)
Malaysia Malaysia	Malaysia (country of)	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. 79) Casual
Taiwan Taiwan Island	Taiwan Island	introduced	ILDIS Co-ordinating Centre (2013)
Thailand Thailand	Thailand (Kingdom of)	native	U.S. Dept. Agr., Agr. Res. Serv. (2013)
Vietnam Vietnam	Vietnam (Socialist Republic of)	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	Swarbrick, J. T. (1997) (p. 65) Senna sulfurea [=Senna surattensis (Burm. f.) H. S. Irwin & Barneby subsp. sulfurea (DC. ex Collad.) Randell]
La Réunion (France) La Réunion Island	La Réunion Island	introduced	ILDIS Co-ordinating Centre (2013)
Maldives Maldive Islands	Malè Atoll		Fosberg, F. R. (1957) (p. 20) "Rare in semi-open places". Voucher cited: Fosberg 36895.
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island	introduced	ILDIS Co-ordinating Centre (2013)
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Rodrigues Island	introduced	ILDIS Co-ordinating Centre (2013)
Seychelles Seychelles Islands	Seychelles Islands	introduced	Invasive Species Specialist Group (2017)

Control: 

Physical:  "Not grazed by cattle"  (Motooka et al., 2003).

Chemical: "Sensitive to triclopyr and perhaps to other hormone-type herbicides.  Senna obtusifolia, another weedy senna, was sensitive to dicamba and triclopyr but not to MCPA"  (Motooka et al., 2003).