2 Questions Discussions: Any questions? Maria M: posting paper and questions for this weekJon: will be picking a paper to post for next weekPeter Stevens is taking students around Orchid house at gardens at 10 am probably on Saturday. Let him or me know if you are interested.Any questions?
6 What’s a flower? What’s it for? Reproductive structure of angiosperms:Heterosporangiate typically consisting of androecium, gynoecium, usually surrounded by a perianth and borne on an axis or receptacle
7 Flower morphology Pedicel Flower parts in whorls: (4,5’s or 3’s) Calyx (sepals), Corolla (petals), Androecium (stamens with anther, filament), Gynoecium (pistils with stigma, style, ovary)
8 SymmetryActinomorphic (radially symmetric) vs zygomorphic (1 bisecting line of symmetry)Asymmetric: uncommon (Cannanceae, Marantaceae)
13 Evolution of oil production and collection Renner and Schaefer Phil. Trans. R. Soc. B. 365:Bees collect oil for larvae and pollinate flowersQuestion: When and how often oil-offering flowers and oil-foraging bees evolved?
14 Oil and beesRenner and Schaefer Phil. Trans. R. Soc. B. 365:Question: When and how often oil-offering flowers and oil-foraging bees evolved?Oil flowers evolved at least 28 times and lost times. Oldest just after the K/T boundary65 mya in America (Melpighiaceae) and Africa (Curcurbitaceae, and Laurasia (Myrsinaceae) taxaBees evolved oil foraging at least 7 times with earliest at least Mya (but probably older)
19 QuestionIs flower symmetry associated with changes in speciation rates mediated via pollinators?
20 QuestionIs flower symmetry associated with changes in speciation rates mediated via pollinators?Suggest bilaterally symmetrical flowers can restrict pollinator access to flowers, direct pollen placement, and lead to greater reproductive isolationPredict that bilaterally symmetrical flowers have higher speciation rates than radially symmetrical flowers
21 QuestionIs flower symmetry associated with changes in speciation rates mediated via pollinators?Corolla symmetry data for animal pollinated families from the literatureSister-group comparisons (40 zygomorphic clades and 19 comparisons)Building an angiosperm tree and mapping on zygomorphyLooking for the actinomorphic sisterGetting number of species in family from literature
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