Geniostoma is a genus of around 49 species of flowering plants in the family Loganiaceae. They are shrubs or small trees, with inflorescences borne in the axils of the simple, petiolate, oppositely-arranged leaves. The flowers are arranged in cymes, and each is pentamerous.
The name Geniostoma derives from the Greek words (; "beard") and (; "mouth"), referring to the hairs in the corolla tube of some species. The genus is widely distributed across the Pacific Ocean from Japan, Malesia to Australia in the west, and east to the Tuamotu Archipelago; one species is also found on the Mascarene Islands.
The Hawaiian endemic genus Labordia is included in Geniostoma by Plants of the World Online and other authors. The Hawaiian species are commonly known as labordias or as kamakahala in Hawaiian.USFWS. Species List: Endangered Plants. These two genera have been grouped together in the family "Geniostomaceae", but are considered by the Angiosperm Phylogeny Group to be part of a wider Loganiaceae.
Species 49 species are accepted.
Geniostoma angustifolium – Mascarene Islands Geniostoma antherotrichum – New Guinea Geniostoma balansanum – New Caledonia Geniostoma borbonicum – Mascarene Islands Geniostoma calcicola – Fiji (Fulaga) Geniostoma celastrineum – New Caledonia Geniostoma clavatum – Society Islands (Raiatea: Mt. Temehani) Geniostoma cyrtandrae – Hawaiian Islands Geniostoma degeneri – Hawaiian Islands Geniostoma densiflorum – New Caledonia and Vanuatu Geniostoma erythrospermum – New Caledonia Geniostoma fagraeoides – Ogasawara Islands Geniostoma gagnae – Marquesas Islands Geniostoma gaudichaudii – Hawaiian Islands Geniostoma glaucescens – New Caledonia Geniostoma grandifolium – Vanuatu Geniostoma hallei – Marquesas Islands Geniostoma hedyosmifolium – Hawaiian Islands Geniostoma helleri – Hawaiian Islands Geniostoma hirtellum – Hawaiian Islands Geniostoma hosakanum – Hawaiian Islands Geniostoma huttonii – Lord Howe Island Geniostoma hymenopodum – Hawaiian Islands Geniostoma imbricatum – New Caledonia Geniostoma kaalae – Hawaiian Islands Geniostoma leenhoutsii – eastern New Guinea and Bougainville Island Geniostoma lorencianum – Hawaiian Islands Geniostoma lydgatei – Hawaiian Islands Geniostoma macrophyllum – Fiji Geniostoma mooreanum – New Caledonia (Î Lifou) Geniostoma novae-caledoniae – New Caledonia Geniostoma pedunculatum – Mascarene Islands Geniostoma petiolosum – Lord Howe Island Geniostoma pumilum – Hawaiian Islands Geniostoma randianum – New Guinea Geniostoma rapense – Tubuai Islands (Rapa Iti) Geniostoma rarotongense – Cook Islands (Rarotonga and Mangaia) Geniostoma rupestre – Taiwan and Malesia to New Guinea, Australia, and the western Pacific Geniostoma rupestre var. australianum Geniostoma rupestre var. crassifolium Geniostoma rupestre var. glaberrimum (syns. Geniostoma astylum and Geniostoma quadrangulare) Geniostoma rupestre var. hoeferi Geniostoma rupestre var. lasiostemon Geniostoma rupestre var. ligustrifolium (syn. Geniostoma ligustrifolium) – hangehange Geniostoma rupestre var. rouffaeranum Geniostoma rupestre var. rupestre (syns. Geniostoma clavigerum, Geniostoma confertiflorum, and Geniostoma uninervium) Geniostoma rupestre var. solomonense Geniostoma rupestre var. thymeleaceum Geniostoma stipulare Geniostoma sykesii – Cook Islands Geniostoma tinifolium Geniostoma trichostylum Geniostoma triflorum Geniostoma umbellatum Geniostoma venosum Geniostoma vestitum Geniostoma waialealae Geniostoma waiolani Geniostoma weinlandii
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