Asterales
Trees (monocalous); hmoerythrina alkaloids + [a 7-C ring], iridoids?; true tracheids +; rays very broad [to 14 cells across, ... ASTERIDAE / ASTERANAE Takhtajan: nicotinic acid metabolised to its arabinosides; (iridoids +); tension wood decidedly uncommon ... Dwarf cushion herbs; iridoids?, tanniniferous; cork cortical?; mucilage cells +; stomata also paracytic; hairs uniseriate, ... Previous Relationships. The iridoids of Menyanthaceae differ chemically from those of Gentianaceae, in which Menyanthaceae used ...