Cephalanthus tetrandrus. A. Flowering branch. B. Axil of the middle and secondary vein showing domatia as tuft of hairs. C. Perfect flower. D. Unfolded corolla. E. Side view of schizocarp. F. Ventral view of mericarp. G. Ventral view of schizocarp. H. Dorsal view of seed with aril. I. Subventral view of seed with aril. Drawn by Laura Simón.

 
 
  Part of: Romero MF, Gonzalez AM, Salas RM (2023) Sylvainia, a new monospecific genus within the subtribe Cephalanthinae (Rubiaceae, Naucleeae). Plant Ecology and Evolution 156(1): 85-111. https://doi.org/10.5091/plecevo.90423