Lapeirousia oreogena, known in English as cushion cabong and in Afrikaans as perskussing, is a species of tuberous geophyte in the Iris family, Iridaceae.

Lapeirousia oreogena was first described in 1897 by Rudolf Schlechter and then subsequently published in Contributions from the Bolus Herbarium by Peter Goldblatt in 1972.

The flowers of L. oreogena are pollinated by a single species of fly in the family Nemestrinidae, Prosoeca marinusi, a relationship described as one of the "most specialized systems" of coevolution among related plants.

[5] The plant grows out of a corm and lacks a stem, it is a perennial that reaches heights of 10 centimetres (3.9 in).

[1] They are borne on an inflorescence at ground level,[4] in the shape of a spiralling spike on slender, undulating bracts that are green in colour.

[12] The flowers of L. oreogena are pollinated by a single[12] species of Nemestrinid fly in the genus Prosoeca,[13][4] described as one of the "most specialized systems" of coevolution among related plants.

When the proboscis is inserted into the tube of sufficient length, as it feeds the fly grabs the tepals of the flower with all three pairs of legs through flexing its tibiae while the wings remain in motion.

[4] In order to facilitate the most efficient transfer of pollen, flies must be just out of reach of the bottom of the nectar tube.

[10] In experiments conducted by Dennis Hansen et al., the flowers' arrow markings were blotted out using black ink from markers which resulted in a reflectivity similar to the base colour of the tepal.

[1] Lapeirousia oreogena has a fairly restricted distribution,[6][1] on the northern extremity of the Cape Floristic Region of South Africa.

[6] In the Nieuwoudtville Wildflower Reserve, plants were found in dense patches in open grassy areas between boulder outcrops made of dolerite.

[15] It was previously assessed as "rare" in a 1996 review by C. Hilton-Taylor for the "Red data list of southern African plants".

[2] The generic epiphet for the genus Lapeirousia is derived from Philippe-Isidore Picot de Lapeyrouse.

"[18] Lapeirousia oreogena was first described in 1897 by Rudolf Schlechter and then subsequently published in Contributions from the Bolus Herbarium by Peter Goldblatt in 1972.