transition vascular leaf A vascular leaf that is part of an heteroblastic series, and is characterized by anatomical features that are intermediate between juvenile and adult leaves. Many species have juvenile leaves at the base of the stem, adult leaves at the apex, and transition leaves in between. In maize, juvenile leaves are at the tip of the stalk (stem), which differentiates first, with adult leaves at the base, while other grasses may have other arrangements. Transition leaves may have mosaics of juvenile and adult tissues, as in Brachypodium. PO:0008018 PO_GIT:371 hoja de transici&#243n (Spanish, exact) plant_anatomy 維管束植物の幼葉と成熟葉の移行期の葉 (Japanese, exact) vascular leaf