Presentation on theme: "Morphology of Range Plants. Objectives Define plant morphology Describe characteristics of the leaves, stems, roots, and flowers of range plants "— Presentation transcript:
Morphology of Range Plants
Objectives Define plant morphology Describe characteristics of the leaves, stems, roots, and flowers of range plants Describe the anatomy of grasses
Plant Morphology Describes the physical form and external structures of a plant
Stems Stems—the axes of plants—consist of nodes (where leaves and axillary buds are produced) separated by internodes.
Stems Hollow or PithySolid Not JointedSolidWoody Solid GrassesGrass-likesForbsShrubs (Sedges)(Rushes)
Leaves Important characteristics Type Arrangement Shape Margin Veination Apex
External Parts of the Leaf
The major parts of the leaf are shown in Figure 4.3. In monocots the leaf is almost always broadly sheathing at the base. In taxa such as grasses and gingers there is an adaxial flap or ligule at the junction of the sheath and blade. A leaf that lacks a petiole is said to be sessile.
Leaf Apex and Base - Various terms relating to the shape of the leaf apex or leaf base include: acute, obtuse, acuminate, emarginate, truncate, and rounded (apex); acute, obtuse, rounded, decurrent, truncate, cordate, lobate, and sagittate (bases).
Flowers Composite Heads Ray FlowersDisk FlowersRay and Disk Flowers
Warm-up 03/15 1. _________ 2. _______ 3. _______ 4. _______ 5. _______ Label the following 5 flower parts.
Parts of the Flower Sepals Outer covering of the flower bud. Protects the stamens and pistils when flower is in bud stage. Collectively known as the calyx.
Parts of the Flower Petals Brightly colored Protects stamen & pistils. Attracts pollinating insects. Collectively called the corolla.
Parts of the Flower (Stamen) Male reproductive part Anther Produces pollen Filament Supports the anther
Parts of the Flower (Pistil) Female reproductive part Ovary Enlarged portion at base of pistil Produces ovules which develop into seeds Stigma Holds the pollen grains
Parts of the Flower (Pistil) Style Connects the stigma with the ovary Supports the stigma so that it can be pollinated
Parts of the Flower
Schematic of a Complete, Perfect Flower
Imperfect Flower Male or female reproductive organs not, but not both. Example: A male flower has sepals, petals, and stamen, but no pistils. A female flower has sepals, petals, and pistils, but no stamen.
Perfect Flowers Contains both male and female reproductive structures.
Incomplete Flowers Missing one of the four major parts of the flower. Stamen Pistil Sepal Petal
Complete Flowers Contains male and female reproductive organs along with petals and sepals.
Flowers Imperfect flowers are always incomplete but…….. Perfect flowers are not always complete and…….. Complete flowers are always perfect.
Importance of Flowers Important in florist & nursery businesses. Many plants are grown solely for their flowers. Plants have flowers to attract insects for pollination, but people grow them for beauty & economic value.
Important Flower Crops
Flower Dissection Working in table group. One dicot and one monocot flower per table Follow directions in your packet.
Stamen Male reproductive structure Composed of an anther and filament The anther produces pollen grains
Pistil Female reproductive structure Composed of stigma, style, and ovary Eggs develop in the ovary
Ovary longitudinal section
Fleshy fruit types
Warm-up 03/16 Monocot or Dicot? Monocot Monocot Dicot