Urostephanus

Urostephanus
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Gentianales
Family:	Apocynaceae
Subfamily:	Asclepiadoideae
Tribe:	Asclepiadeae
Subtribe:	Gonolobinae
Genus:	Urostephanus ; B.L.Rob. & Greenm.

Last updated August 31, 2025

Urostephanus is a genus of flowering plants in the dogbane family Apocynaceae. Its species are found in Mexico, Guatemala, and Honduras.^[1] Originally described in 1895, it was resurrected from the non‑ monophyletic milkvine genus Matelea in 2024.^[2]

Species

The following species are accepted:^[1]

Urostephanus araneosus (Donn.Sm.) Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado
Urostephanus balrog (Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado) Gonz.-Martínez
Urostephanus cornutus (Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado) Gonz.-Martínez
Urostephanus gonoloboides B.L.Rob. & Greenm.
Urostephanus jaimesiae (Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado) Gonz.-Martínez
Urostephanus lokii (Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado) Gonz.-Martínez
Urostephanus medusae (Woodson) Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado
Urostephanus patalensis (Donn.Sm.) Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado
Urostephanus porphyranthus (Standl.) Gonz.-Martínez, Lozada-Pérez & L.O.Alvarado

References

1 2 "Urostephanus B.L.Rob. & Greenm". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 19 August 2025.
↑ González-Martínez, César Adrián; Lozada-Pérez, Lucio; Olson, Mark E.; Alvarado-Cárdenas, Leonardo O. (2024). "Systematics of Urostephanus: Resurrection of a Mesoamerican taxon of Gonolobinae (Apocynaceae, Asclepiadoideae), with eight new combinations". Acta Botanica Mexicana (131). doi:10.21829/abm131.2024.2302.

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[POWO_3783-1-1] 1 2 "Urostephanus B.L.Rob. & Greenm". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 19 August 2025.

[2] González-Martínez, César Adrián; Lozada-Pérez, Lucio; Olson, Mark E.; Alvarado-Cárdenas, Leonardo O. (2024). "Systematics of Urostephanus: Resurrection of a Mesoamerican taxon of Gonolobinae (Apocynaceae, Asclepiadoideae), with eight new combinations". Acta Botanica Mexicana (131). doi:10.21829/abm131.2024.2302.

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