PBIO 004 Lecture Notes - Lecture 1: Storage Organ, Floral Design, Gynoecium
29 Oct 2020
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Lecture 1 and 2: plant classification and structure. Plant classification by growing cycles and flowering times: annual: complete life cycle in one year, but is a function of the climate, with some plants annuals only in cold regions. Half hardy: needs some protection from cold. Tender: low to no tolerance for frost: biennial: lives for two seasons, usually flowering in the second only. After dying they self-sow, giving the appearance of being perennial: perennial: live more than two years, but this is a function of climate, bulbs, corms and tubers: overwinter in specialized underground structures, collectively called geophytes. Root descriptors: fibrous: many small roots, often near the surface, tap: one of several main thick roots that go very deep. Shoot descriptors: node: place where leaf joins stem. Leaf descriptive terms: arrangement on stem: Alternate: not across stem from each other, alternate up the stem. Whorled: three plus leaves attached to the stem at the same point: location on plant:
