Sicyos L.
Sicyos was a poorly understood genus for quite a long time. According to current insights, corroborated by molecular data (e.g. Sebastian & al. 2012; Telford & al. 2012), it counts 75 species that are mostly distributed in the New World, especially Central and South America (much less according to previous authors; see for instance Cox 1997). There is a remarkable concentration of species in Hawaii (Mabberley 2008). Only one species, Sicyos angulatus, widely occurs outside its native distribution range, either as an aggressive agricultural or environmental weed, or as an escape from cultivation.
Literature:
Cox C.J. (1997) Sicyos. In: Cullen J. & al. (eds.), The European Garden Flora, vol. 5. Cambridge University Press, Cambridge: 297.
Mabberley D.J. (2008) Mabberley’s plant-book (3th ed.). Cambridge University Press, Cambridge: XVIII + 1021 p.
Nesom G. (2015) Sicyos. In: Flora of North America Editorial Committee (eds.), Flora of North America North of Mexico, vol. 6. Oxford University Press, New York: 25-27. [available online at: http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=130305]
Sebastian P., Schaefer H., Lira R., Telford I.R.H. & Renner S.S. (2012) Radiation following long distance dispersal: the contributions of time, opportunity, and diaspore morphology in Sicyos (Cucurbitaceae). Journal of Biogeography 39: 1427-1438. [available online at: https://www.researchgate.net/publication/230802662_Radiation_following_long_distance_dispersal_the_contributions_of_time_opportunity_and_diaspore_morphology_in_Sicyos_%28Cucurbitaceae%29]
Telford I.R.H., Sebastian P., de Lange P.J., Bruhl J.J. & Renner S.S. (2012) Morphological and molecular data reveal three rather than one species of Sicyos (Cucurbitaceae) in Australia, New Zealand and Islands of the South West Pacific. Austr. Syst. Bot. 25(3): 188-201. [available online at: http://www.umsl.edu/~renners/Telford_Sicyos_AustrSystBot2012.pdf]