Abstract
Comparative studies on floral morphol- ogy, anatomy, and histology were performed to identify shared features of the genera of Apo- danthaceae (Rafflesiales): Apodanthes, Pilostyles, and Berlinianche. Berlinianche was studied for the first time in detail and its affinity to Apodanth- aceae was confirmed. It has a previously unde- scribed hair cushion on the inner perianth organs and inaperturate pollen. Shared features of mem- bers of Apodanthaceae are: unisexual flowers; three (or four) alternating di-/tetra- or tri-/hexa- merous whorls of scales of which the inner one or two correspond to a perianth; a synandrium with pollen sacs typically arranged in two rings; opening by a dehiscence line between the two rings of pollen sacs; large vesicular hairs above the synandrium; a gynoecium with four united carpels; inferior and unilocular ovaries with four parietal placentae, ovules tenuinucellate, anatro- pous with two well developed integuments, ori- ented in various directions; a nectary disk. Apodanthaceae share some special structural features with Malvales.
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