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. | grass | Yes | No |
| Urtica dioica (Urticaceae) | Urtica galeopsifolia Wierzb. ex Opiz; Urtica gracilis Aiton; Urtica holosericea Nutt.; Urtica lyallii S. Watson; Urtica tibetica W.T. Wang | herb | No | No |
| Urtica urens (Urticaceae) | herb | Yes | No |