CHEM 2370 Lecture 26: Lecture 26

• School: University of Manitoba
• Department: Chemistry
• Course: CHEM 2370
• Professor: N A

Document Summary

Angiosperms are the most successful group of the land plants on earth and are generally divided into two groups. We used to refer to monocots and dicots as the two groups but it turns out that dicots by molecular evidence are paraphyletic. But most what we considered as dicots, we now call eudicots. The monocots are some 50000 species and they include the lilies, orchids, grasses and many economic plants for human uses such as corn, wheat, dates and rice. Eudicots are some 200000 species and include elms, willows, roses, peas and canola. Starting from the stem or at the base of the flower are structures called sepals and the next layers on top are the pedals. In the center lies the carpel which consists of three parts: the upper most is the stigma which is the receptive surface where the sperm will land. The middle section is the style which the structure the pollen tube grows through.