BioStor
 | Notes on the distribution and habitat of Columellia G K Brizicky and W L Stern (1969) Journal of the Arnold Arboretum 50: 76-79 |
 | Generic limits in the tribe Cladothamneae (Ericaceae), and its position in the Rhododendroideae B A Bohm, S W Brim et al. (1978) Journal of the Arnold Arboretum 59: 311-341 |
 | Flora of Panama. Part VIII. Family 149. Ericaceae Robert L Wilbur and James L Luteyn (1978) Annals of the Missouri Botanical Garden 65: 27-143 |
 | Additional notes on the Eriocaulaceae. LXXXII H N Moldenke (1979) Phytologia 41: 451-485 |