BIO 2137 Lecture Notes - Lecture 10: Perianth, Tepal, Allogamy
12 Jan 2018
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Document Summary
Origin of angiosperms = a single common ancestor. 2 main classes: monocotyledons monocots, eudicotyedones (eudicots, *magnoliids, 3% of angiosperms cannot be put easily in either monocots or dicots, they possess ancestral traits (primitive) Old hypothesis: robust bisexual flowers with numerous flower like parts, like magnolia. Current hypothesis: anita, perianth with tepals, low (but variable) numbers of tepals, stamens and carpels, imperfect angiospermy (carpels are free, fused in superior part only by secretion and not epidermis, not completely shut. Angiosperm phylogeny: most recent molecular data suggest that the primary division of angiosperms is not monocot/dicot, but monoaperturate versus triaperturate, with the anita group, plants with imperfect angiospermy, at the base of the tree. Features of flowers pollinated by: beetles, strong odor, large flowers, inferior ovary, hymenoptera (bees, wasps, ants, ample nectar and pollen (food), blue or yellow, landing platform, butterflies and moths.
