San Elijo Lagoon Plant Guide Glossary

  • Achene : A dry, one seeded fruit that does not open when ripe.
  • Angiosperm : Flowering plants; plants in which the ovules are produced and fertilized and develop within an ovary.
  • Anther : upper portion of the stamen that produces the pollen. Image
  • Awn : A long, bristle-like appendage as on the floret of a grass. Image
  • Basal : Growing from or at the base of a plant; a basal rosette is a clump of leaves at the plant base.
  • Bract : A modified leaf sometimes associated with a flower; may resemble a small leaf, a petal or a scale.
  • Calyx : Outermost ring of flower parts, composed of sepals. Usually green. Encloses the developing bud and usually persists below the open flower. Image
  • Capsule : A dry fruit that splits open when ripe; it has many seeds in several chambers.
  • Catkin : A dense, cylindrical cluster of unisexual flowers, usually lacking petals.
  • Cauline : Growing from or on the stem of a plant.
  • Composite flower head : The specialized flower of the Sunflower family (Asteraceae). Tiny flowers, crowded together on a common base (the receptacle), resemble a single bloom. Flowers are of one or two types: symmetrical disk flowers and strap-shaped ray (or ligulate) flowers.    Image  
  • Compound leaf : A leaf composed of distinct, leaf-like leaflets arranged along the leaf stem. Arrangement either bilaterally symmetrical (pinnate) or radially symmetrical (palmate). A leaflet may be distinguished from a true leaf because a leaf has a small bud where the stem joins the main plant; a leaflet does not.
  • Cordate : Heart-shaped; a cordate leaf has a rounded-notched base and acute or pointed tip.
  • Corolla : Collective term for the petals on a flower. Image
  • Cotyledon : “Seed leaf”; leaf produced in the embryo and usually the first to emerge on a young plant. Traditionally, flowering plants were divided into Monocotyledons (monocots) and Dicotyledons (dicots) depending on whether the embryo had one or two cotyledons. Although this system of classification has been modified, the distinction is still useful.
  • Dicot : Or Dicotyledon; in a previous taxonomic system this was one of two major divisions of flowering plants, characterized in part by having two seed leaves (cotyledons) and flower parts in multiples of 4's or 5's. The dicots were recently replaced by Eudicots and Basal Dicots; the former corresponds closely with the original Dicot division.
  • Dioecious : Having male and female reproductive organs in different flowers on different plants.
  • Disk floret : (Disk flower): A tiny, symmetrical flower of a composite flower head (sunflower family, Asteraceae). In a daisy, disk florets form the inner eye.    Image
  • Eudicot : or eudicotyledon: the largest group of flowering plants.  Modern taxonomy has split the former dicotyledon group into  eudicots (or "true dicots" ) and primative dicots.
  • Filament : Thread-like part of the male reproductive structure that supports the anther. Image
  • Floret : One flower of a composite flower head (Asteraceae)  Image; or one flower and bract of a grass (Poaceae)  Image  
  • Flower head : In the sunflower family, one group of flowers clustered on a common base; often assumed to be one blossom.  Image  
  • Fruit : The structure around the seed or seeds; a mature (fertilized) ovary.
  • Glume : One of two scale-like bracts at the base of a grass spikelet; unlike most bracts, a glume does not subtend a flower.  Image  
  • Gymnosperm : Plants in which the ovules are produced and fertilized and develop unprotected by ovary or fruit. Best known Gymnosperms are the conifers such as pines, firs, spruces and hemlocks.
  • Halophyte : A plant than can grow in a salty environment. This is defined and evaluated in terms of salinity (NaCl), but most halophytes can tolerate either salinity or alkalinity (often a mixture of other salts deposited by fresh water).
  • Haploid/Diploid : haploid: having cells with only one set, or n, chromosomes; diploid: having cells with two sets, or 2n, chromosomes, usually one set from each parent. The alternation between diploid and haploid phases is the basis for sexual reproduction.
  • Inferior ovary : The ovary arises below the insertion point of the petals and sepals; sometimes resembles a swollen portion of the flower stalk.
  • Inflorescence : A cluster of flowers on a stem or sytem of stems.
  • Involucre : A group of bracts (phyllaries) that form a unit below a flower, flower cluster, flower head (composite flower) or fruit.  Image  
  • Lanceolate : A shape that is much longer than broad and widest near the base.
  • Lemma : he lower of two bracts at the base of a grass floret; the upper is the palea.  Image  
  • Monocot : Monocotyledon; one of two or three major divisions of flowering plants; characterized by having one seed leaf (cotyledon) and flower parts in multiples of three.
  • Monoecious : Having male and female reproductive organs in different flowers on the same plant.
  • Nectary : Nectar producing glands, often in the base of a flower. Image
  • Oblanceolate : A shape that is much longer than wide and broadest nearer the tip than the center.
  • Obovate : Shaped like an inverted egg: somewhat longer than wide and widest near the top.
  • Ovary : The swollen basal portion of the pistil that produces the seeds.  Most ovaries are one of two types, superior or inferior. Unless otherwise specified, an ovary is superior.  Image
  • Ovate : Shaped like an egg.
  • Palea : The upper of two bracts at the base of a grass floret; the lower is the lemma  Image  
  • Palmate : A radial arrangement with elements radiating from a common point; arranged like fingers around a palm.
  • Pappus : A hairy or bristly modified calyx on the seeds of some composite flowers; often aids in seed dispersal.  Image
  • Pedicel : Stalk of an individual flower or fruit.
  • Peduncle : Stalk of a flower cluster or inflorescence.
  • Petal : One of several modified leaves that surround the reproductive structures of a flower; often brightly colored. Image
  • Petiole : Leaf stalk.
  • Phyllary : One of several bracts around the base of a composite flowerhead  Image  
  • Pinnate : A bilateral arrangement with elements on both sides of a common axis; arranged like a feather.
  • Pistil : The female reproductive structure of a plant, usually consisting ovary, style and stigma.   Image
  • Pollinium : A packet of pollen grains transported as a unit.
  • Ray floret : (Ligulate floret): A tiny, strap-shaped flower of a composite flower head (sunflower family, Asteraceae). In a daisy, ray florets form the outer halo. Some botanists recognize two types of strap-shaped florets: a ray floret has three petals fused into the strap and two rudimentary petals, is found only on the periphery of the flower head and usually lacks stamens; other strap-shaped florets are called ligualate florets.   Image  
  • Receptacle : The part of the plant to which a flower is attached. Image
  • Rhizome : A horizontal, underground stem that produces roots and vertical shoots.
  • Sepal : Individual element of the calyx, which encloses the flower bud; usually leaf-like.  Image
  • Sessile : Flower: lacking a pedicel or leaf: lacking a petiole; attached directly to stem.
  • Stamen : The male reproductive structure of a flowering plant. Consists of a pollen-producing anther supported by the thread-like filament. Image
  • Stellate : Star-shaped; having several arms from a central point.
  • Stigma : Top portion of the pistil which captures the pollen.  Image
  • Stipule : One or two appendages at a leaf base; may appear as scales, spines, glands, etc.
  • Stolon : A horizonal, above-ground stem that can produce roots and vertical shoots
  • Style : Narrow portion of the pistil that connects the stigma and the ovary. Image
  • Superior ovary : The ovary rises above the insertion point of the petals and sepals.
  • Taproot : A root that is longer, stronger and more dominant than the other roots.
  • Trichome : A hair-like structure.
  • Umbel : A flower arrangement in which the pedicels of the flowers originate from a single point, much like the ribs of an umbrella.