Stephen R. Downie

Athamanta montana, synonym Tinguarra montana, is a species of plants in the family Apiaceae, endemic to the Canary Islands.

Angelica capitellata, synonym Sphenosciadium capitellatum, is a species of flowering plant in the family Apiaceae. When treated as Sphenosciadium capitellatum, it was the only species in the monotypic genus Sphenosciadium. It is known by the common names woollyhead parsnip, ranger's buttons, button parsley, and swamp white heads.

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Tiedemannia filiformis (syn. Oxypolis filiformis) is a species of flowering plant in the carrot family known by the common names water cowbane and water dropwort. It grows in swamps, freshwater wetlands, and along the borders of ponds in the southeastern United States, as far north as Delaware, as well as the northern Bahamian pineyards of the Bahamas.

Pseudoridolfia is a genus of flowering plants belonging to the family Apiaceae. Its native range is Morocco. Species: Pseudoridolfia fennanei Reduron, Mathez & S.R.Downie

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Siculosciadium is a genus of flowering plants in the carrot family Apiaceae. It is monotypic, being represented by the single species Siculosciadium nebrodense, which grows as a perennial subshrub endemic to the Madonie massif of Sicily. It is the sole species in . The species was first described as Pteroselinum nebrodense by Giovanni Gussone in 1843. In 2013 it was placed in its own genus as Siculosciadium nebrodense.

Siculosciadium is a genus of flowering plants in the carrot family Apiaceae. It is monotypic, being represented by the single species Siculosciadium nebrodense, which grows as a perennial subshrub endemic to the Madonie massif of Sicily. It is the sole species in . The species was first described as Pteroselinum nebrodense by Giovanni Gussone in 1843. In 2013 it was placed in its own genus as Siculosciadium nebrodense.

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Laserocarpum is a genus of flowering plants in the family Apiaceae. It includes a single species, Laserocarpum pseudomeum, a perennial endemic to central and southern Greece.

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