Plant Threats to Pacific Ecosystems

PIER species listed by scientific name beginning with the letter H

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 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
Hakea salicifolia   (Proteaceae) Embothrium salicifolium Vent.; Hakea saligna (Andrews) Knight shrub/tree No No
Hamelia patens   (Rubiaceae) Hamelia erecta Jacq.; Hamelia nodosa M. Martens & Galeotti shrub Yes No
Harungana madagascariensis   (Clusiaceae) Haronga madagascariensis (Lam. ex Poir.) Choisy tree No No
Hedera algeriensis   (Araliaceae)   vine No No
Hedera canariensis   (Araliaceae) Hedera helix subsp. canariensis (Willd.) Cout. 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
Hedychium longicornutum   (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   (Malvaceae) Heliocarpus americanus L. tree Yes No
Heliotropium indicum   (Boraginaceae)   herb Yes No
Heliotropium ovalifolium   (Boraginaceae) Euploca ovalifolia (Forssk.) Diane & Hilger herb No No
Heliotropium procumbens   (Boraginaceae) Euploca procumbens (Mill.) Diane & Hilger 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) Strobilanthes reptans (G. Forst.) Moylan ex Y.F. Deng & J.R.I. Wood herb Yes No
Heteranthera reniformis   (Pontederiaceae)   aquatic herb No No
Heterocentron subtriplinervium   (Melastomataceae)   herb Yes No
Heteromeles arbutifolia   (Rosaceae) Heteromeles salicifolia (C. Presl) Abrams; Photinia arbutifolia Lindl.; Photinia salicifolia C. Presl shrub/tree Yes No
Heterospathe elata   (Arecaceae) Heterospathe palauensis Becc. tree Yes No
Heterotheca grandiflora   (Asteraceae)   herb Yes No
Hevea brasiliensis   (Euphorbiaceae) Siphonia brasiliensis Willd. ex A. Juss. tree Yes No
Hibiscus diversifolius   (Malvaceae)   herb Yes No
Hibiscus sabdariffa   (Malvaceae)   shrub Yes No
Hibiscus syriacus   (Malvaceae)   shrub Yes No
Hippeastrum puniceum   (Amaryllidaceae) Amaryllis punicea Lam. herb Yes No
Hippeastrum striatum   (Amaryllidaceae) Amaryllis striata Lam.; Hippeastrum puniceum, misapplied in Hawai‘i and likely elsewhere. herb Yes No
Hippobroma longiflora   (Campanulaceae) Isotoma longiflora (L.) C. Presl; Laurentia longiflora (L.) Endl.; Lobelia longiflora L. herb Yes No
Hiptage benghalensis   (Malpighiaceae) Hiptage madablota Gaertn. shrub Yes No
Hirschfeldia incana   (Brassicaceae) Brassica adpressa Boiss.; Erucastrum incanum (L.) Koch; Sinapis incana L. herb Yes No
Holcus lanatus   (Poaceae) Holcus argenteus C. Agardh ex Roem. & Schult.; Notholcus lanatus (L.) Nash ex Hitchc. grass Yes Yes
Homalanthus populifolius   (Euphorbiaceae) Omalanthus populifolius Graham, orth. var. tree Yes No
Hordeum chilense   (Poaceae) Critesion chilense (Roem. & Schult.) Á. Löve grass Yes Yes
Hordeum murinum   (Poaceae)   grass Yes No
Hordeum secalinum   (Poaceae) Critesion secalinum (Schreb.) Á. Löve; Hordeum pratense Huds. grass Yes Yes
Houttuynia cordata   (Saururaceae)   herb Yes No
Hovenia dulcis   (Rhamnaceae)   tree No No
Howea forsteriana   (Arecaceae) Denea forsteriana (F. Muell. ex H. Wendl.) O. F. Cook; Kentia forsteriana F. Muell. ex H. Wendl. tree Yes No
Hoya australis   (Apocynaceae) Hoya dalrympliana F. Muell. vine Yes No
Hura crepitans   (Euphorbiaceae)   tree No No
Hybanthus attenuatus   (Violaceae) Ionidium attenuatum Humb. & Bonpl. ex Schult. herb No No
Hydrangea macrophylla   (Hydrangeaceae) Hortensia opuloides Lam.; Hydrangea chungii Rehder; Hydrangea hortensia Siebold; Hydrangea opuloides (Lam.) K. Koch; Viburnum macrophyllum Thunb. herb Yes No
Hydrilla verticillata   (Hydrocharitaceae)   aquatic herb Yes No
Hydrocotyle bonariensis   (Araliaceae)   herb No No
Hydrocotyle ranunculoides   (Araliaceae)   herb No No
Hydrolea zeylanica   (Hydroleaceae) Nama zeylanica L. aquatic herb No No
Hygrophila costata   (Acanthaceae) Hygrophila brasiliensis (Spreng.) Lindau; Hygrophila guianensis Nees.; Ruellia brasiliensis Spreng. aquatic herb No No
Hygrophila polysperma   (Acanthaceae)   aquatic herb No No
Hylocereus costaricensis   (Cactaceae)   cactus Yes No
Hylocereus polyrhizus   (Cactaceae) Cereus polyrhizus F. A. C. Weber cactus Yes No
Hylocereus undatus   (Cactaceae) Cereus undatus Haw. succulent Yes No
Hymenachne amplexicaulis   (Poaceae)   grass No No
Hyparrhenia rufa   (Poaceae)   grass Yes No
Hypericum androsaemum   (Hypericaceae)   shrub No No
Hypericum calycinum   (Hypericaceae)   shrub Yes Yes
Hypericum canariense   (Hypericaceae) Hypericum floribundum Aiton shrub Yes No
Hypericum perforatum   (Hypericaceae) Hypericum vulgare Lam. herb Yes No
Hypochaeris glabra   (Asteraceae)   herb Yes No
Hypochaeris radicata   (Asteraceae)   herb Yes No
Hypoestes phyllostachya   (Acanthaceae) Hypoestes sanguinolenta hort. herb Yes No
Hyptis brevipes   (Lamiaceae)   herb No No
Hyptis capitata   (Lamiaceae)   herb Yes No
Hyptis mutabilis   (Lamiaceae) Cantinoa mutabilis (Rich.) Harley & J. F. B. Pastore; Nepeta mutabilis Rich. herb Yes No
Hyptis pectinata   (Lamiaceae) Mesosphaerum pectinatum (L.) Kuntze; Nepeta pectinata L. 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) Bystropogon sidifolius L'Hér.; Mesosphaerum sidifolium (L'Hér.) Harley & J. F. B. Pastore herb Yes No
Hyptis suaveolens   (Lamiaceae) Ballota suaveolens L.; Mesosphaerum suaveolens (L.) Kuntze herb Yes No

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