Hyptis suaveolens (L.) Poit., Lamiaceae

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Present on Pacific Islands?  yes

Threat only at high elevations?  no

Risk assessment results:  Reject, score: 19 (Go to the risk assessment)

Common name(s): [more details]

Chamorro: mumutun

English: chan, horehound, pignut, stinking Roger, wild spikenard

French: gros baume, hyptis à odeur

Spanish: chao, hierba de las muelas, hortela do campo

Habit:  herb

Description:  "Strong-scented herb to 1.5 m tall with quadrate hairy stems and ovate to obovate leaves 3-5 cm long and 2-4 cm wide, the margins serrulate, lower surface densely hairy; petioles up to 3 cm long.  Flowers in small cymes along branch ends with reduced leaves.  Calyx 5 mm long in flower, 10 mm long in fruit, ribbed.  Corolla blue.  Nutlets about 1.2-1.5 mm long, slightly notched at the end" (Stone, 1970; pp. 511-512).

Habitat/ecology:  Favors dry open locations (Stone, 1970; pp. 511-512). In Hawai‘i, "now sparingly naturalized in relatively dry, disturbed sites, 150-300 m" (Wagner et al., 1999; pp. 802, 1882). In Australia, "roadsides, disturbed or overgrazed areas, watercourses, pastures and open forests where soil is well drained. Forms dense thickets, especially on flood plain margins and around camp sites." (Smith, 2002; p. 61). In New Guinea, "a weed of roadsides and pastures; considered dangerous to livestock. Widely spread at low altitudes" (Henty & Pritchard, 1975; p. 106).

Propagation:  "Seed in flower heads spread by water.  Seeds also dispersed by animals, humans, vehicles (including slashers and machinery), and when attached to fur, clothing and mud." (Smith, 2002; p. 61). Often a contaminant in pasture grass seed. As with H. capitata, the seed can remain dormant under the rainforest canopy for many years until an opening is created.

Native range:  Tropical America, now widespread as a weed.

Presence:

Pacific
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Federated States of Micronesia Chuuk Islands	Chuuk Islands		Bishop Museum (Honolulu) (1947) (voucher ID: BISH 150563) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Federated States of Micronesia Chuuk Islands	Dublon (Tonowas) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Chuuk Islands	Fefan Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Chuuk Islands	Param Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Chuuk Islands	Param Island		Bishop Museum (Honolulu) (1936) (voucher ID: BISH 150562) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Federated States of Micronesia Chuuk Islands	Ulalu (Romonum) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Chuuk Islands	Weno (Moen) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Chuuk Islands	Weno (Moen) Island		Bishop Museum (Honolulu) (1946) (voucher ID: BISH 150561) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Federated States of Micronesia Yap Islands	Yap (Waqab) Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Federated States of Micronesia Yap Islands	Yap (Waqab) Island		Bishop Museum (Honolulu) (1936) (voucher ID: BISH 150560) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Federated States of Micronesia Yap Islands	Yap (Waqab) Island		Bishop Museum (Honolulu) (1948) (voucher ID: BISH 150564) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
French Polynesia Society Islands	Tahiti Island		? (year unknown)
Guam Guam Island	Guam Island	introduced invasive	Stone, Benjamin C. (1970) (pp. 511-512) Vouchers cited: Stone 3862 (GUAM), Stone 4393 (GUAM)
Guam Guam Island	Guam Island	introduced	Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce (1979) (p. 241)
Guam Guam Island	Guam Island		Bishop Museum (Honolulu) (year unknown) (voucher ID: BISH 150612) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Guam Guam Island	Guam Island		Bishop Museum (Honolulu) (1946) (voucher ID: BISH 436413) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Guam Guam Island	Guam Island		Bishop Museum (Honolulu) (1966) (voucher ID: BISH 655716) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
Guam Guam Island	Guam Island		Bishop Museum (Honolulu) (1966) (voucher ID: BISH 655718) Taxon name on voucher: Hyptis suaveolens (L.) Poit.
State of Hawaii Hawaiian Islands	Hawai‘i (Big) Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 802)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Starr, Forest/Starr, Kim/Loope, Lloyd L. (2006) (p. 36) East Maui. Voucher cited: Starr & Martz 010726-1 (BISH)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R. (1995) (p. 22) Voucher cited: Imada et al. s.n. (BISH)
Niue Niue	Niue Island	introduced invasive	Space, James C./Waterhouse, Barbara M./Newfield, Melanie/Bull, Cate (2004) (p. 11) Initial control action taken.
Papua New Guinea Papua New Guinea (eastern New Guinea Island)	Papua New Guinea (eastern New Guinea Island)	introduced invasive	Henty, E. E./Pritchard, G. H. (1975) (p. 106)
Philippines Philippine Islands	Philippine Islands		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Solomon Islands Solomon Islands	Solomon Islands		Swarbrick, John T. (1997) (p. 93)
Solomon Islands Solomon Islands	Solomon Islands	native	Hancock, I. R./Henderson, C. P. (1988) (p. 83)

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	introduced invasive	Smith, Nicholas M. (2002) (p. 61)
Australia Australia (continental)	Queensland	introduced invasive	Smith, Nicholas M. (2002) (p. 61)
China China	China (People's Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Colombia Colombia	Colombia (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Costa Rica Costa Rica	Costa Rica (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Indonesia Indonesia	Indonesia (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Mexico Mexico	Mexico (United Mexican States)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Nicaragua Nicaragua	Nicaragua (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Panama Panama	Panama (Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Taiwan Taiwan	Taiwan Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Thailand Thailand	Thailand (Kingdom of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)
Vietnam Vietnam	Vietnam (Socialist Republic of)		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)

Indian Ocean
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Mauritius Mautitius Islands (Mauritius and Rodrigues)	Mauritius Island		Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. (1979) (pp. 189-190)

Comments:  On Hawai‘i State and Northern Territory, Australia, noxious weed lists.

Control: 

Physical: Grub and burn small infestations.

Chemical: "Use an overall spray of amine or ester 2,4-D, spot spraying where applicable.  All sprays should be applied before flowering begins.  Other herbicides such as dicamba, clopyralid and picloram based mixtures also are effective but more expensive"  (Parsons and Cuthbertson, 1992; pp. 490-492).

Additional information:  Additional online information about Hyptis suaveolens is available from the Hawaiian Ecosystems at Risk project (HEAR).

Taxonomic information about Hyptis suaveolens may be available from the Germplasm Resources Information Network (GRIN).

References:

Bishop Museum (Honolulu). 0. Voucher specimen #BISH 150612 (Thompson, J.B. 144).

Bishop Museum (Honolulu). 1936. Voucher specimen #BISH 150560 (Takamatsu, M. 1897).

Bishop Museum (Honolulu). 1936. Voucher specimen #BISH 150562 (Takamatsu, M. 322).

Bishop Museum (Honolulu). 1946. Voucher specimen #BISH 150561 (Fosberg, F.R. 24424).

Bishop Museum (Honolulu). 1946. Voucher specimen #BISH 436413 (Fosberg, F.R. 25406).

Bishop Museum (Honolulu). 1947. Voucher specimen #BISH 150563 (Wong, C.C.Y. 220).

Bishop Museum (Honolulu). 1948. Voucher specimen #BISH 150564 (Wong, C.C.Y. 536).

Bishop Museum (Honolulu). 1966. Voucher specimen #BISH 655716 (Evans, M. 1705).

Bishop Museum (Honolulu). 1966. Voucher specimen #BISH 655718 (Evans, M. 1531).

Fosberg, F. R./Sachet, Marie-Hélène/Oliver, Royce. 1979. A geographical checklist of the Micronesian dicotyledonae. Micronesica 15:1-295.

Hancock, I. R./Henderson, C. P. 1988. Flora of the Solomon Islands. Research Bulletin No. 7. Ministry of Agriculture and Lands, Honiara. 203 pp.

Henty, E. E./Pritchard, G. H. 1975. Weeds of New Guinea and their control. 2nd edition. Department of Forests, Division of Botany, Botany Bull. No. 7. Lae, Papua New Guinea. 180 pp.

Holm, Leroy/Pancho, Juan V./Herberger, James P./Plucknett, Donald L. 1979. A geographical atlas of world weeds. John Wiley & Sons, New York. 391 pp.

Parsons, W. T./Cuthbertson, E. G. 1992. Noxious weeds of Australia. Inkata Press, Melbourne/Sydney. 692 pp.

Smith, Nicholas M. 2002. Weeds of the wet/dry tropics of Australia - a field guide. Environment Centre NT, Inc. 112 pp.

Space, James C./Waterhouse, Barbara M./Newfield, Melanie/Bull, Cate. 2004. Report to the Government of Niue and the United Nations Development Programme: Invasive plant species on Niue following Cyclone Heta. UNDP NIU/98/G31 - Niue Enabling Activity. 80 pp.

Starr, Forest/Starr, Kim/Loope, Lloyd L. 2006. New plant records from the Hawaiian Archipelago. In: Evenhuis, Neal L. and Eldredge, Lucias G., eds. Records of the Hawaii Biological Survey for 2004-2005. Part 1: Articles. Bishop Museum Occasional Papers 87:31-43.

Stone, Benjamin C. 1970. The flora of Guam. Micronesica 6:1-659.

Swarbrick, John T. 1997. Weeds of the Pacific Islands. Technical paper no. 209. South Pacific Commission, Noumea, New Caledonia. 124 pp.

U.S. Dept. Agr., Agr. Res. Serv. 2007. National Genetic Resources Program. Germplasm Resources Information Network (GRIN). Online searchable database.

Wagner, Warren L./Herbst, Derral R. 1995. Contributions to the Flora of Hawai‘i. IV. New Records and name changes. In: Evenhuis, Neal L. and Miller, Scott, E., eds. Records of the Hawaii Biological Survey for 1994. Part 2: Notes. Bishop Museum Occasional Papers. 42:13-27.

Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. 1999. Manual of the flowering plants of Hawaii. Revised edition. Bernice P. Bishop Museum special publication. University of Hawai‘i Press/Bishop Museum Press, Honolulu. 1919 pp. (two volumes).