Measurements of quantitative characters yield continuous data (value ranges) (Ex: plant height),
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1 Taxonomic Evidence- Vegetative Characteristics Character and Character States An aspect of a plant, such as leaf shape or petal color is a character. Each character can have a character state, such as red or white petals. Character states that can be quantified or measured against a standard are quantitative characters Other characters that cannot be measured as a numerical value such as ovary position, fruit type, or presence of secondary compound are qualitative characters. Discontinous vs. Continuous Characters Measurements of quantitative characters yield continuous data (value ranges) (Ex: plant height), or discontinous data for discrete, integer,or number values ( Ex: numbers of leaves). Taxonomists employ many different kinds of characters in their studies of plant variation. Macroscopic features Microscopic features Vegetative terminology Plants often vary continuously, and the structures that you observe on a given plant will probably not match the illustrations or definitions precisely. You may encounter a feature that is an intermediate between two terms. In this situation, terms are often used in combination such as leaves linear-lanceolate.
2 Traditionally, the flowering plants were divided into : Recent molecular studies do not support the simple division of monocots and dicots. Several distinct lineages of flowering plants: Eudicots Monocots Major monocot groups are the lilies, palms, grasses, sedges and bromeliads Monocot Dicot
3 Life span Annual- A plant that completes its life cycle in one growing season. Biennial-A plant that completes its life cycle in two growing seasons. Perennial- Any plant that lives for more than 2 growing seasons. All trees and shrubs are perennials. Plant habit Herb- A plant with little or no above-ground perennial tissue. Annual (underground parts die back), biennial, or perennial. Shrub- A woody perennial plant of comparatively low stature with 1 to many relatively slender trunks from near its base. Tree- A large woody plant with one to several relatively massive trunks and elevated crown. Growing condition may determine whether a particular woody plant matures as a tree or a shrub. Succulent-A plant with thick, watery leaves and/or stems. Vine-A woody or herbaceous plant that trails on the ground or climbs. Plant organs -Roots -Stems -Leaves The roots have multiple functions, including 1) absorption of water and nutrients 2) anchorage of the plant in the soil
4 There are two major types of root system: 1) Fibrous root system. Fibrous root systems are highly branched, with several main roots. Annual grasses generally have fibrous root systems. 2) Tap root system. Tap root systems have a single main root with only short lateral branches. Development of the root system Fibrous roots often have different modes of development. In many grasses, multiple roots originate from embryonic roots above the radicle. These are called seminal roots. Adventitious roots develop from the shoot system.
5 Plant organs Stems are part of the shoot system and have several functions. Provide support for the leaves and flowers. Conduct water and nutrients Produce new shoot cells and tissues in apical meristems. The primary stem of dicots differs from the stem of monocots. Nodes the region of the stem from which 1 or more leaves or branches emerge Internode the stem regions between the nodes
6 Plant organs -Stem types Stem modifications for special functions Rhizomes: They have all the structures of stems and can branch underground or produce new upright stems and complete new plants with adventitious roots. Tubers: Tubers have large quantities of stored starch and function in vegetative reproduction. Corms are also modified stems used for storage and vegetative reproduction. Leaves The basic function of most leaves is photosynthesis, the process that transforms light energy into chemical energy and produces sugars. Monocot leaves are different from those of dicots. The monocot leaf also has parallel venation. Dicot leaves have netted venation and are connected to the stem by a petiole. Leaves are shaped to capture light. The expanded region of the leaf is called the blade. The petiole is the stalk of the leaf, sometimes absent.
7 Stipules They are sometimes attached to the petiole, sometimes to the stem, or fused to the stem. Leaf Complexity Leaves with a single blade are called simple leaves. Simple leaves can have smooth or toothed margins. The leaves may also be lobed or divided.
8 Leaf Complexity Leaves that are so deeply divided that the blade forms several separate units are called compound leaves. A palmately compound leaf has the leaflets diverging from a single point, like digits from the palm of a hand. A pinnately compound leaf has the leaflets arranged along an axis, like the pinnae of a fern. Leaf Attachment The petiole of dicot leaves is a fairly simple extension attachment of the leaf blade to the stem. The sheath of monocot leaves is more complex. In grasses, the sheath wraps completely around the stem, often extending most of the length of the internode.
9 Leaf Arrangement (Phyllotaxy) Leaf Venation Leaf Blade Shape
10 Leaf Apices Leaf Bases Leaf Margins- as view from the top/as viewed from the side
11 Special Features tendril- leaf or portion of the stem modified into a thin, coiled structure. spines modified leaf thorn modified stem that arises from the axil of a leaf prickles - sharp outgrowth from the epidermis or cortex of the stem. Surface Features
12 Study outline- Taxonomic Evidence- Vegetative Characteristics -Understand the following terms and examples: character, character state, quantitative vs qualitative characters, continuous vs. discontinuous characters, macroscopic vs. microscopic -Know general characteristics of eudicots and monocots -Know different life spans- annual, biennial and perennial -Know different plant habits- herb, shrub, tree, succulent, woody vine, epiphyte (lab), parasite (lab0 -Know general characters of plant organs-roots, leaves and stems -Know general functions of roots -Know difference between fibrous and tap roots -Know different modified roots- seminal roots, prop roots, adventitious roots -Know general functions of stems -Differentiate between monocot and dicot stems -General characteristics-node, internode -Know different modified stems-rhizomes, corms, tubers -Know general functions of leaves -Differentiate between monocot and dicot leaves -Know general leaf terminology- blade, petiole, stipule, adaxial vs abaxial, basal vs apical -Know leaf complexity- simple vs. compound, pinnately compound, palmately compouond, bipinnately compound, unifoliate (lab), bifoliate (lab) and trifoliate (lab) -Know leaf attachment-petiolate, sessile, perfoliate, clasping, sheathed -Know leaf arrangement (phyllotaxy)-basal, opposite, alternate, whorled -Know leaf venation- palmate (netted), pinnate (netted), parallel, and rotate -Know other leaf characteristics-leaf blade shape, leaf apices, leaf bases, leaf margins, special features (tendril, spine, thorn and prickle), surface features
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