Plant Threats to Pacific Ecosystems

PIER species listed by scientific name beginning with the letter U

A product of the Pacific Island Ecosystems at Risk project (PIER)

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This table lists all species profiled on PIER with the genus beginning with the letter U.  An alphabetical index to all PIER species is also available. Also, the complete alphabetical of all PIER species is available, but it is a large list and may take a while to load on systems with slower internet connections.  It includes those of environmental concern (including those that are probably of threat only to islands with high elevations) as well as agricultural and ruderal weeds.  Each species is linked by its scientific name to an individual write-up containing relevant information.

Species are listed in alphabetic order.  You can browse this list or use the "find" function on your web browser to search by scientific name.

Can't find it here?  Check the list of synonyms for other names (the more common synonyms are included below) or search other lists and databases available on the Internet.

Stumped by botanical terms?  Here are links to a brief glossary and a search engine for botanical terms.


Scientific name (+Family) Often-used other Latin names Habit Present on
Pacific Islands?
Primarily a threat
at high elevations?
Ugni molinae   (Myrtaceae) Eugenia ugni Hook. & Arn.; Myrtus molinae Barnéoud ex Gay; Myrtus ugni Molina shrub Yes No
Ulex europaeus   (Fabaceae)   shrub Yes No
Ulmus parvifolia   (Ulmaceae) Ulmus sieboldii Daveau tree Yes No
Ulmus pumila   (Ulmaceae)   tree No Yes
Uraria lagopodioides   (Fabaceae)   herb Yes No
Urena lobata   (Malvaceae) Urena sinuata L. shrub Yes No
Urochloa brizantha   (Poaceae) Brachiaria brizantha (Hochst. ex A. Rich.) Stapf; Panicum brizanthum (Hochst. ex A. Rich.) grass Yes No
Urochloa decumbens   (Poaceae) Brachiaria decumbens Stapf grass Yes No
Urochloa glumaris   (Poaceae) Brachiaria paspaloides (Presl) Hubbard; Panicum glumare Trin.; Urochloa paspaloides Presl grass Yes No
Urochloa humidicola   (Poaceae) Brachiaria humidicola (Rendle) Schweickerdt grass Yes No
Urochloa mosambicensis   (Poaceae) Urochloa pullulans Stapf grass No No
Urochloa mutica   (Poaceae) Brachiaria mutica (Forssk.) Stapf; Brachiaria purpurascens Henr.; Panicum barbinode Trin.; Panicum guadeloupense Steudel; Panicum muticum Forssk.; Panicum purpurascens Raddi grass Yes No
Urochloa plantaginea   (Poaceae) Brachiaria plantaginea (Link) Hitchc.; Panicum plantagineum Link grass Yes No
Urochloa reptans   (Poaceae) Brachiaria reptans (L.) C. A. Gardner & C. E. Hubb.; Panicum reptans L. grass Yes No
Urochloa subquadripara   (Poaceae) Brachiaria subquadripara (Trin.) Hitchc.; Panicum subquadriparum Trin.; Urochloa distachya (L.) T. Q. Nguyen grass Yes No
Urtica urens   (Urticaceae)   herb Yes No

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This page was last regenerated on 8JUL2017.