Steven Allen Hammer

Haworthia bayeri is a species of the genus Haworthia in the family Asphodelaceae, endemic to the southern Cape Provinces in South Africa.

Lithops coleorum is a small flowering succulent plant of the family Aizoaceae. It is native to Limpopo Province of South Africa. It is named for the botanical collectors Desmond Thorne Cole and his wife Naureen Adele Cole.

Vlokia is a genus of flowering plants in the family Aizoaceae. It is endemic to the Cape Provinces of South Africa. The first description of the genus (along with the species Vlokia ater) was published in 1994 by Steven A. Hammer. The generic name honors the discoverer of Vlokia ater, South African botanist Jan H. J. Vlok (born 1957). The pronunciation "Flow-key-a" has been recommended based on the pronunciation of his name.

Hartmanthus is a genus of subtropical, succulent flowering plants in the family Aizoaceae, native to the lower Orange River in ǁKaras, Namibia and Northern Cape, South Africa.

Brianhuntleya is a genus of flowering plants belonging to the family Aizoaceae. It is native to the Cape Provinces of South Africa. Species: Brianhuntleya intrusa (Kensit) Chess., S.A.Hammer & I.Oliv. Brianhuntleya purpureostyla (L.Bolus) H.E.K.Hartmann Brianhuntleya quarcicola (H.E.K.Hartmann) H.E.K.Hartmann

Vlokia ater was the first species described for the genus Vlokia in the Aizoaceae plant family. The genus name (generic epithet) honors the discoverer, South African botanist, Jan H. J. Vlok (1957-). The species name (specific epithet) derives from the Latin adjective "ater" for "black" and refers to the black coloring which older leaf leaves assume.

Vlokia ater was the first species described for the genus Vlokia in the Aizoaceae plant family. The genus name (generic epithet) honors the discoverer, South African botanist, Jan H. J. Vlok (1957-). The species name (specific epithet) derives from the Latin adjective "ater" for "black" and refers to the black coloring which older leaf leaves assume.

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Bulbine bruynsii is a species of plant in the genus Bulbine. It is endemic to South Africa.

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Conophytum chrisolum is a species of succulent plant in the Iceplant Family Aizoaceae. It is endemic to the Richtersveld region of Northern Cape Province in South Africa. It may be the smallest free-living, land dwelling (non-aquatic) flowering plant, and certainly is the smallest succulent, measuring no more than 0.4 inch (10 mm) in height by less than 0.25 inch (6 mm) in width. It never branches or divides. It was only discovered in 1994 by botanical explorer Chris Rodgerson. The solitary magenta colored flower, up to 0.8 inch (20 mm) in diameter, is wider than the plant.

Cheiridopsis velox is a species of succulent plant from South Africa.

Cheiridopsis umbrosa is a succulent plant from South Africa.

Cheiridopsis ponderosa is a species of succulent plant from South Africa.

Bulbine lolita is a species of flowering plant in the family Asphodelaceae, native to the Knersvlakte region of the Northern Cape province of South Africa. It is the smallest known monocot succulent, measuring no more than 3/5ths inch (15 mm) wide by 1/4th inch (6 mm) in height. A recent discovery, it was unknown prior to 1999. It is also remarkable for its multicolored leaves.

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