This table lists all species profiled on PIER with the genus beginning with the letter H. 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? |
| Haematoxylum campechianum (Fabaceae) | tree | Yes | No | |
| Hamelia patens (Rubiaceae) | Hamelia erecta Jacq.; Hamelia nodosa M. Martens & Galeotti | shrub | Yes | No |
| Harungana madagascariensis (Clusiaceae) | tree | No | No | |
| Hedera algeriensis (Araliaceae) | vine | No | No | |
| Hedera helix (Araliaceae) | vine | Yes | No | |
| Hedychium coronarium (Zingiberaceae) | herb | Yes | No | |
| Hedychium flavescens (Zingiberaceae) | herb | Yes | No | |
| Hedychium gardnerianum (Zingiberaceae) | herb | Yes | No | |
| Helianthus annuus (Asteraceae) | Helianthus lenticularis Douglas | herb | Yes | No |
| Helianthus argophyllus (Asteraceae) | herb | Yes | No | |
| Helichrysum foetidum (Asteraceae) | Gnaphalium foetidum L. | herb | Yes | Yes |
| Heliconia spp. (Heliconiaceae) | herb | Yes | No | |
| Heliocarpus popayanensis (Tiliaceae) | Heliocarpus americanus L. | tree | Yes | No |
| Heliotropium indicum (Boraginaceae) | herb | Yes | No | |
| Heliotropium ovalifolium (Boraginaceae) | herb | No | No | |
| Heliotropium procumbens (Boraginaceae) | herb | Yes | No | |
| Hemarthria altissima (Poaceae) | Manisuris altissima (Poir.) Hitchc.; Rottboellia altissima Poir. | grass | Yes | No |
| Hemigraphis alternata (Acanthaceae) | Hemigraphis colorata (Blume) Hallier fil.; Ruellia alternata Burm. f. | herb | Yes | No |
| Hemigraphis reptans (Acanthaceae) | herb | Yes | No | |
| Heterocentron subtriplinervium (Melastomataceae) | herb | Yes | No | |
| Heterotheca grandiflora (Asteraceae) | herb | Yes | No | |
| Hevea brasiliensis (Euphorbiaceae) | tree | Yes | No | |
| Hibiscus diversifolius (Malvaceae) | herb | Yes | No | |
| Hibiscus sabdariffa (Malvaceae) | shrub | Yes | No | |
| Hippeastrum puniceum (Liliaceae) | herb | Yes | No | |
| Hippobroma longiflora (Campanulaceae) | Isotoma longiflora (L.) C. Presl; Laurentia longiflora (L.) Endl. | herb | Yes | No |
| Hiptage benghalensis (Malpighiaceae) | Hiptage madablota Gaertn.; Triopteris jamaicensis L. | shrub | Yes | No |
| Hirschfeldia incana (Brassicaceae) | herb | Yes | No | |
| Holcus lanatus (Poaceae) | grass | Yes | Yes | |
| Homalanthus populifolius (Euphorbiaceae) | Omalanthus populifolius Graham | tree | Yes | No |
| Hordeum murinum (Poaceae) | grass | Yes | No | |
| Hovenia dulcis (Rhamnaceae) | tree | No | No | |
| Hura crepitans (Euphorbiaceae) | tree | No | No | |
| Hybanthus attenuatus (Violaceae) | herb | No | No | |
| Hydrilla verticillata (Hydrocharitaceae) | aquatic herb | Yes | No | |
| Hydrocotyle bonariensis (Apiaceae) | herb | No | No | |
| Hydrocotyle ranunculoides (Apiaceae) | herb | No | No | |
| Hydrolea zeylanica (Hydrophyllaceae) | Nama zeylanica L. | aquatic herb | No | No |
| Hygrophila polysperma (Acanthaceae) | aquatic herb | No | No | |
| Hylocereus costaricensis (Cactaceae) | cactus | Yes | No | |
| Hylocereus polyrhizus (Cactaceae) | cactus | Yes | No | |
| Hylocereus undatus (Cactaceae) | succulent | Yes | No | |
| Hymenachne amplexicaulis (Poaceae) | grass | No | No | |
| Hyparrhenia rufa (Poaceae) | grass | Yes | No | |
| Hypericum androsaemum (Clusiaceae) | shrub | No | No | |
| Hypericum canariense (Clusiaceae) | shrub | Yes | No | |
| Hypericum perforatum (Clusiaceae) | herb | Yes | No | |
| Hypochoeris glabra (Asteraceae) | herb | Yes | No | |
| Hypochoeris radicata (Asteraceae) | herb | Yes | No | |
| Hyptis brevipes (Lamiaceae) | herb | No | No | |
| Hyptis capitata (Lamiaceae) | herb | Yes | No | |
| Hyptis mutabilis (Lamiaceae) | herb | Yes | No | |
| Hyptis pectinata (Lamiaceae) | herb | Yes | No | |
| Hyptis rhomboidea (Lamiaceae) | Hyptis capitata var. mexicana Briq.; Hyptis capitata var. pilosa Briq.; Hyptis decurrens (Blanco) Epling | herb | Yes | No |
| Hyptis sidifolia (Lamiaceae) | herb | Yes | No | |
| Hyptis suaveolens (Lamiaceae) | herb | Yes | No |