plant_lab_handout - Page 1 of 10 Angiosperm Morphology –...

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Page 1 of 10 Angiosperm Morphology – vegetative and reproductive From Katie Hansen’s Native Plants course Main objective for this lab : To learn the basic morphology of plants and to be able to key out plants. angiosperm – flowering plant whose seeds develop within a fruit morphology – the study of form and structure First, the vegetative parts of a plant - the roots, stems, and leaves. Type of plant based on duration of life, seasonal changes, and class: annual – a plant that completes its life cycle in one year or less(germinates, flowers, sets seed, and dies) perennial – a plant that lives for several years; may have persistent above-ground woody stems, or may be herbaceous with stems that die back to the ground each year biennial – a plant that lives for two years; usually it only grows vegetatively the first year, storing energy in roots over the winter, then flowers, fruits, and dies the second year evergreen – having leaves that persist and remain green throughout the year deciduous – having leaves that die or fall off in the cold/dry season monocotyledon (monocot ) – those flowering plants which have a single cotyledon (embryonic leaf) in the seed (ex: grasses, orchids, or lilies) dicotyledon (dicot ) – those flowering plants that have two cotyledons in the seed (ex: beans, oaks, tomatoes) Plant growth forms (habit): herb – (herbaceous, adj .) a plant lacking woody stems shrub – a perennial woody plant of relatively low stature, typically with several stems arising from or near the ground tree – a large woody plant , usually with a single main stem or trunk vine – plant with a climbing or twining, woody or herbaceous stem; plants can climb by one of these methods: twining – the stem wraps around an object for support tendrils – modified shoots or leaves that coil around the support aerial roots – small roots, often with sucker-like tips (ex. poison ivy, Virginia creeper) epiphyte – a plant that grows on another plant, but it does not get food or water from it parasite – a plant that grows on another plant and obtains some food or water from it Roots: taproot – the main root axis from which smaller root branches arise, often associated with dicots fibrous roots – a root system with all of the branches of approximately equal thickness Stem Anatomy: bud – a compressed, undeveloped shoot or flower; may be axillary or terminal node – position on the stem where leaves or branches originate internode – the portion of a stem between two nodes lenticel – slightly raised, spongy areas in the skin or bark of a stem that allow interchange of gases between internal tissues and the atmosphere
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Page 2 of 10 Stem Modifications: tuber – underground stem modified for food storage; bears nodes and buds (ex. potato) stolon – an elongate, horizontal, above-ground stem that roots at the nodes or tip giving rise to a new
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This note was uploaded on 10/03/2009 for the course BIO 50100 taught by Professor Brand during the Fall '09 term at University of Texas.

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plant_lab_handout - Page 1 of 10 Angiosperm Morphology –...

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