BIO 2137 Lecture Notes - Lecture 8: Monophyly, Pinus Monophylla, Carboniferous
21 Jan 2021
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Document Summary
The seed being enclosed within an ovary distinguishes angiosperms from gymnosperms (gymnosperms naked seeds) 0. 3% (750 species) of all vascular plants are gymnosperms. Other well known species - christmas trees. Appeared in late carboniferous period (300 ma) Diversified during permian (290-245 ma), dry and cold climate. Possess many morphological adaptations to these dry conditions. The most diversified and widespread phylum of living gymnosperms. Fascicles are short shoots in which the activity of the apical meristem is suspended (determinate branch) - they look like needles. Gymnosperms are very diverse, pines branches are determined (the apical meristem stops growing - in plants thats rare, flowers represent a determine axis - usually the tips keep growing which makes them indeterminate) Pinus longaeva grow in cold and or dry conditions on the white mountains. 3 or 5 leaves - but pinus monophylla has 1 found in low deserts. When reducing the surface area, we save water.
