Fig. 4
From: Vascular architecture of the monocot Cyperus involucratus Rottb. (Cyperaceae)
a Pdf for medullary stem intervein distances. b Pdf for intervein peripheral bundles. c Medullary veins of scape internode with those that extend into fifth bract internode (filled circle) and those that don’t (unfilled circle) which are located at the margin. d Diagram of fates of various veins with vein a shifting to a marginal site because of extinction of some marginal medullary veins