Jim Bidlack - BIO 5354/4354 PLANT ANATOMY Lecture 22 - Leaf Venation and Leaf Development I. Leaves compared to roots and stems A. Leaf is build like an umbrella B. Support comes from the petiole C. Has a determinant structure - it reaches a size and then stops growing (roots and stems can be thought of as indeterminant) D. Pattern recognition 1. Roots and stems - stelar and nodal patterns 2. Leaves - venation II. Types of leaf venation A. Lower vascular plants - no minor veins 1. Open dichotomous - series of equal divisions 2. Modified open dichotomous - has a midrib 3. Single midvein - single midvein B. All flowering plants 1. Reticulate a) Craspedodromous - mostly dicots w/ vein endings b) Camptodromous - mostly dicots w/ vein endings c) Parallelodromous - monocots without/ vein endings (entire margin) 2. Venation in dicots follows the pattern: midrib, secondary veins (or first order laterals), tertiary veins (second order lateral), etc., until finest veins encountered a) Area bound by the finest is referred to as an aereole
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This note was uploaded on 01/16/2012 for the course BI 200 taught by Professor Potter during the Fall '11 term at Montgomery College.