Ruellia prostrata Poir., Acanthaceae

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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Other Latin names:  Dipteracanthus prostrata (Poir.) Nees

Common name(s): [more details]

English: bell weed, black weed

Maori (Cook Islands): mapua, tītā ‘aruru

Samoan: vao uli

Habit:  herb

Description:  "Prostrate perennial herbs; stems often rooting at the nodes. Leaves green, lower surface conspicuously paler, ovate, 2-10 cm long, (0.9-) 1.5-4.5 cm wide, sparsely strigose, especially on upper surface, petioles 5-30 mm long. Flowers solitary in the leaf axils, each one subtended by oblanceolate to ovate bracts 15-23 mm long; calyx lobes 5, linear, 6-10 mm long; corolla violet blue to occasionally nearly white, 2.4-3.2 cm long, the lobes slightly spreading. Capsules clavate, 1.5-2 cm long, densely puberulent" (Wagner et al., 1999; p. 174).

Habitat/ecology:  A weed in disturbed areas. "Common to abundant in disturbed places, pastures, and under crops such as coconut and cacao" (Whistler, 1983; p. 18).

Propagation:  Seed and from rooting at nodes (Whistler, 1983; p. 18).

Native range:  Java.

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	Ofu Island	introduced	Ragone, Diane/Lorence, David H. (2003) (p. 53)
American Samoa Manu‘a Islands	Ofu Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2001) (voucher ID: PTBG 34852) Taxon name on voucher: Ruellia prostrata Poir.
American Samoa Manu‘a Islands	Olosega Island	introduced	Ragone, Diane/Lorence, David H. (2003) (p. 53)
American Samoa Manu‘a Islands	Olosega Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2001) (voucher ID: PTBG 37086) Taxon name on voucher: Ruellia prostrata Poir.
American Samoa Manu‘a Islands	Olosega Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2001) (voucher ID: PTBG 37100) Taxon name on voucher: Ruellia prostrata Poir.
American Samoa Manu‘a Islands	Ta‘u Island	introduced	Ragone, Diane/Lorence, David H. (2003) (p. 53)
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2001) (voucher ID: PTBG 34741) Taxon name on voucher: Ruellia prostrata Poir.
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (2002) (voucher ID: PTBG 40510) Taxon name on voucher: Ruellia prostrata Poir.
American Samoa Manu‘a Islands	Ta‘u Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1991) (voucher ID: PTBG 10522) Taxon name on voucher: Ruellia prostrata
American Samoa Tutuila Islands	Tutuila Island		National Tropical Botanical Garden (U.S.A. Hawaii. Kalaheo.) (1999) (voucher ID: PTBG 288) Taxon name on voucher: Ruellia prostrata
Cook Islands Southern Cook Islands	Aitutaki Atoll		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Aitutaki Atoll	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 76)
Cook Islands Southern Cook Islands	‘Atiu Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	‘Atiu Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 82)
Cook Islands Southern Cook Islands	‘Atiu Island		Bishop Museum (Honolulu) (1991) (voucher ID: BISH 664873) Taxon name on voucher: Ruellia prostrata Poir.
Cook Islands Southern Cook Islands	Mangaia Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Mangaia Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 88)
Cook Islands Southern Cook Islands	Ma‘uke Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Ma‘uke Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 94)
Cook Islands Southern Cook Islands	Miti‘aro Island		McCormack, Gerald (2013)
Cook Islands Southern Cook Islands	Miti‘aro Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 99)
Cook Islands Southern Cook Islands	Rarotonga Island		McCormack, Gerald (2013)
Federated States of Micronesia Kosrae Island	Kosrae Island	introduced invasive	Josekutty, P. C./Wakuk, E. E./Joseph, M. J. (2002) (p. 63)
Federated States of Micronesia Pohnpei Islands	Pohnpei Island		Wagner, W. L./ Herbst, D. R./Weitzman, A./Lorence, D.H. (2013)
State of Hawaii Hawaiian Islands	Maui Island	introduced invasive	Oppenheimer, Hank L. (2003) (p. 4) West Maui. Vouchers cited: Oppenheimer H50110 (BISH, PTBG), Oppenheimer H120107 (BISH, PTBG)
State of Hawaii Hawaiian Islands	Moloka‘i Island	introduced invasive	Oppenheimer, Hank L. (2003) (p. 4) Voucher cited: Oppenheimer H110137 (BISH, PTBG)
State of Hawaii Hawaiian Islands	O‘ahu Island	introduced invasive	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 174)
Niue Niue	Niue Island	introduced	Whistler, W. A. (1988) (p. 5) Voucher cited: Sykes 1384
Niue Niue	Niue Island	introduced invasive	Whistler, W. A./Atherton, J. (1997) (p. 24)
Niue Niue	Niue Island	introduced invasive	Space, James C./Waterhouse, Barbara M./Newfield, Melanie/Bull, Cate (2004) (p. 46)
Samoa Western Samoa Islands	Savai‘i Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 71)
Samoa Western Samoa Islands	Upolu Island	introduced invasive	Space, James C./Flynn, Tim (2002) (p. 68)
Samoa Western Samoa Islands	Upolu Island		Bishop Museum (Honolulu) (1975) (voucher ID: BISH 418003) Taxon name on voucher: Ruellia prostrata Poir.
Vanuatu New Hebrides Islands	Vanuatu (Republic of)		Swarbrick, John T. (1997) (p. 96)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island	introduced invasive	Meyer, Jean-Yves (2007) (p. 29)
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis (‘Uvea) Island		Bishop Museum (Honolulu) (1968) (voucher ID: BISH 36632) Taxon name on voucher: Ruellia prostrata Poir.
Wallis and Futuna Wallis and Futuna (Horne) Islands	Wallis and Futuna Islands		Whistler, W. A. (1988) (p. 5)

Pacific Rim
Country/Terr./St. & Island group	Location	Cited status & Cited as invasive & Cited as cultivated & Cited as aboriginal introduction?	Reference & Comments
Indonesia Indonesia	Indonesia (Republic of)	native	Wagner, Warren L./Herbst, Derral R./Sohmer, S. H. (1999) (p. 174)

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	native	Orchard, Anthony E., ed. (1993) (p. 16)

Comments:  A common weed of roadsides and disturbed places in Samoa.

Control:  If you know of control methods for Ruellia prostrata, please let us know.