gel_lec_18

gel_lec_18 - Lecture 18 Angiosperms flowering plants What...

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Lecture 18 – 2/24/10 Angiosperms – flowering plants What are angiosperms? Characters - Presence of flowers - An enclosed ovary (carpel or carpels) - A bi-layered seed coat covering the ovules - Pollen with columellae composing the exocarp - Double fertilization - A xylem and phloem with specialized conducting cells When did they first appear? Plants landed latest Ordovician; in the Permian they flourished. Conifers used to exist in Paleozoic, but after extinction, did really well and took over gymnosperms. Angiosperms only arrived in early cretaceous. What were early angiosperms? - Archaeanthus, magnolia, oldest fossil - Water lily, early cretaceous - Archaefructus: doesn’t have any petal but has carpel; early cretaceous; was a water plant with flowers - Amborella: small tree under shade of others; only survived in New Caledonia; more basal than water lilies - More likely angiosperms evolved on land What are angiosperms good at? Compared to gymnosperms…
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This note was uploaded on 08/30/2011 for the course GEL 3 taught by Professor Motani,r during the Spring '08 term at UC Davis.

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gel_lec_18 - Lecture 18 Angiosperms flowering plants What...

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