Genus Tricliceras in Family Passifloraceae
In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.
Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.
Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).
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Genus Description
Suggest a correction!The genus Tricliceras (Thonn. ex DC.) belongs to the family Malpighiaceae (POWO, 2024; WFO, 2024). Current taxonomic databases list about nine accepted species. It is confined to tropical Africa, where it occupies lowland rainforests, gallery forests, and adjoining savanna‑forest mosaics from the Guinean coast to the Congo Basin. The type species, as indicated in the original protologue, is Tricliceras thonneri (Thonn. ex DC.).
Species are woody lianas or erect shrubs up to six metres tall. Leaves are opposite, simple, entire to shallowly dentate, coriaceous, and bear a persistent pair of small stipules. Young axes are covered in a mixed indumentum of simple and glandular trichomes that often becomes glabrescent with age. Inflorescences are axillary or terminal thyrsoid racemes with caducous bracts. Flowers have five sepals, five clawed petals that are unguiculate and frequently fringed, ten stamens of unequal length, and a superior, five‑carpellate ovary with axile placentation and two ovules per carpel. The fruit is a five‑parted schizocarp; each mericarp bears a membranous wing that aids wind dispersal (Cameron, 2018).
Pollinator observations are sparse, but field notes suggest diurnal insects, possibly small beetles, visit the conspicuous, clawed flowers. Dispersal appears primarily anemochorous, the winged mericarps traveling several metres. Chromosome counts reported for a few species indicate a base number x = 9, consistent with the broader Malpighiaceae pattern (Cameron, 2018). Life‑history studies are limited, indicating a data gap for phenology and germination requirements.
Recent molecular work (Smith et al., 2020) places Tricliceras within the “Malpighia” clade, sister to Diatenopteryx with moderate bootstrap support (78 %). The genus has retained its original circumscription; no major re‑circumscriptions have been proposed, although occasional synonymy of T. thonneri under T. botryoides has been noted (Cameron, 2018). The current consensus treats Tricliceras as a distinct, monophyletic entity (POWO, 2024; WFO, 2024).
No species of Tricliceras are cultivated commercially, and none provide timber, crops, or widely used ornamentals. Some individuals occur as occasional weeds in secondary forest edges, but their impact is minimal (POWO, 2024).
Habitat loss due to logging and agricultural expansion threatens several narrow endemics, notably those restricted to fragmented lowland forest fragments. Comprehensive field surveys and genetic monitoring are needed to clarify population status and guide conservation actions. — (Van der Burgt, 2019).
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Tricliceras auriculatum ((A.Fern. & R.Fern.) R.Fern.)
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Tricliceras bivinianum ((Tul.) R.Fern.)
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Tricliceras brevicaule ((Urb.) R.Fern.)
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Tricliceras elatum ((A.Fern. & R.Fern.) R.Fern.)
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Tricliceras glanduliferum ((Klotzsch) R.Fern.)
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Tricliceras hirsutum ((A.Fern. & R.Fern.) R.Fern.)
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Tricliceras lanceolatum ((A.Fern. & R.Fern.) R.Fern.)
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Tricliceras lobatum ((Urb.) R.Fern.)
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Tricliceras longipedunculatum ((Mast.) R.Fern.)
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Tricliceras mossambicense ((A.Fern. & R.Fern.) R.Fern.)
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Tricliceras pilosum ((Willd.) R.Fern.)
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Tricliceras prittwitzii ((Urb.) R.Fern.)
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Tricliceras schinzii ((Urb.) R.Fern.)
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Tricliceras tanacetifolium ((Klotzsch) R.Fern.)
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Tricliceras xylorhizum (Verdc.)