Two closely related annual Diascia species, restricted to the Nieuwoudtville area of the western Cape, are described and compared. Diascia lewisiae K.E. Steiner is known from only two localities on the Roggeveld escarpment and is characterized by reddish-purple saccate flowers with erect stamens and small pubescent projections from the posticous filaments. Diascia insignis K.E. Steiner is known only from the Nieuwoudtville Wildflower Reserve and three contiguous farms south of Nieuwoudtville.

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... is characterized by long spurs, long projections from the posticous filaments and two depressions at the base of the upper corolla lip. Both D. lewisiae and D. insignis secrete floral oil, are self-incompatible, and are pollinated by oil-collecting bees in the genus Rediviva Friese (Melittidae). Twee naverwante eenjarige Diascia spesies wat tot die Nieuwoudtville area in die Wes-Kaap beperk is, word beskryf. Diascia lewisiae K.E. Steiner is slegs van twee lokaliteite langs die Roggeveld plato rand bekend en word gekenmerk deur die rooi-pers sakvormige blomme en die regop meeldrade met klein harige uitgroeisels aan die agterste paar helmdrade. Diascia insignis K.E. Steiner is slegs van die Nieuwoudville Veldblomreservaat en drie aangrensende plase suid van Nieuwoudtville bekend. Dit word gekenmerk deur die lang spore, die lang uitgroeisels aan die paar agterstandige helmdrade en die twee holtes aan die basis van die boonste blomkroonlip. Beide D. lewisiae en D. insignis produseer blomolie, is selfonvrugbaar en word bestuif deur Rediviva Friese (Melittidae) olieversamelende bye.