Orthrosanthus exsertus (R.C. Foster) Ravenna in Wrightia 7: 10. 1981 sec. Espejo Serna & al. 2010
- ≡Orthrosanthus chimboracensis var. exsertus R.C. Foster in Contr. Gray Herb. 155: 49. 1945 syn. sec. Espejo Serna & al. 2010
- =Orthrosanthus chimboracensis f. albus Steyerm. in Lloydia 11: 17. 1948 syn. sec. Espejo-Serna & López-Ferrari 2008
- =Orthrosanthus monadelphus subsp. exsertus (R.C. Foster) Ravenna in Bol. Soc. Argent. Bot. 10: 319. 1965 syn. sec. Espejo-Serna & López-Ferrari 2008