Anthophyta - Structure and Function of Plants - Lecture Notes, Study notes of Biology

Download Anthophyta - Structure and Function of Plants - Lecture Notes and more Study notes Biology in PDF only on Docsity! Anthophyta (Angiosperms) – The Flowering Plants II 1. The transition from seed plant ancestors to those that we classify as the Angiosperms is very abrupt with little or no information on what intermediates may have existed. 2. Darwin’s abominable mystery - "The rapid development as far as we can judge of all the higher plants within recent geological times is an abominable mystery." 3. The 24hour history of earth… most important here is that the angiosperms appear roughly 130mya and have diversified to near current diversity by 90mya! 4. Graph of diversity through time – angiosperms take over at about 100 mya. 5. Modified figure 20-2 – outdated view or angiosperms origin hypotheses. We are covering these hypotheses as examples of incorrect inference. 6. Bennittitales 7. Bennittiales. 8. Second hypothesis – Gnetum and Welwitschia 9. Gnetum, an example of how a potential intermediate was/is viewed, but where did the carpel come from? 10. Earliest known angiosperm fossil 125mya – Archaefructus - China 11. We will focus on three major names regarding the diversification of the angiosperms. a. Amborella as a representative of the “Basal Angiosperms” b. The Eudicots (most of what you would have traditionally called “dicots” c. The Monocots (no major changes relative to what you may have learned previously) 12. Amborella is currently considered the most ancestral version of an angiosperm 13. Eudicots • Reticulate leaf venation • Two cotyledons • Flower parts in 4s/5s or multiples of 4/5. • Tricolpate pollen grains (three “holes”) Docsity.com