Fig. 1From: Linking the evolution of development of stem vascular system in Nyctaginaceae and its correlation to habit and species diversificationDiversity of stem ontogenies in Nyctaginaceae, illustrating developmental steps from eustele types to cambial variants. A Ontogeny 1 (interxylary phloem): polycyclic eustele, cambium from the CCP, phloem strands with different arrangements, illustrated by Colignonia glomerata (upper) forming bands and Pisonia aculeata (lower) forming phloem islands. B Ontogeny 2 (successive cambia): regular eustele, extra-fascicular cambium derived from the pericycle, additional successive bands or rings; Leucaster caniflorus. C Ontogeny 3 (successive cambia): regular eustele, regular cambium, new cambium formed de novo from the pericycle, additional successive bands or rings; Reichenbachia hirsuta. D Ontogeny 4 (successive cambia): polycyclic eustele, regular cambium derived from the CCP, new cambium formed de novo from the pericycle, additional small bands or rings of successive cambia; Allionia incarnata (upper) and Okenia hypogaea (lower). Drawing: Marcelo KuboBack to article page