RLEM 304 1-9
Terms
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- Pistillate
- Having one or more pistils but no functional stamens.
- Placenta
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The tissue within an ovary to which ovules are attached.
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Axillary Placentation
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A placentation type found in compound ovaries in which the placental area of the ovary is attached to an axis derived from the connote margins of the component carpels. Such an ovary is divided into two or more locules by septa.
- Basal Placentation
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A placentation type found in both simple and compound ovaries in which one or more seeds or ovules are attached at the bottom of the ovary.
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Free Central Placentation
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A placentation type found in compound ovaries with only one locule in which ovules are attached to a free-standing axis in the middle of the ovary and septa are absent; derived from axile placentation.
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Parietal Placentation
- A placentation type found in compound ovaries in which the placental areas are attached to the side walls of the ovary. Such an ovary usually has one locule. Sometimes broadly used to include marginal placentation.
- Prickle
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A small, often weak, spinelike body originating from the epidermal or cortical layers and borne irregularly on the bark or epidermis.
- Procumbent
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Trailing or lying flat but not rooting.
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Fibrous Root
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A root system of several to many relatively slender roots of about the same diameter.
- Taproot
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An enlarged vertical main root that is noticeably larger in diameter than the lateral roots.
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Septum
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A partition; used particularly for the partitions derived from carpel wall tissue that divide a compound ovary into 2 or more locules.
- Spine
- A woody modified leaf or part of a leaf; sometimes used loosely to mean any sharp-hard structure including thorns and prickles.
- Staminate
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Having one or more stamens but no functional pistil.
- Rhizome
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An underground horizontal stem involved in perennation or vegetative reproduction.
- Stolon
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A horizontal stem that roots at the nodes and gives rise to a new plant at its tip.
- Suture
- A line of fusion or dehiscence.
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Actinomorphic Symmetry
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Radially symmetric, regulaar; with the parts in a perianth whorl all alike with 2 or more lines of symmetry.
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Bilabiate symmetry
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Shape of sympetalous corolla or calyx with lobes oriented in two groups; two-lipped.
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Bilateral Symmetry
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Zygomorphic; irregular; with only one line of symmetry.
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Irregular symmetry
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Bilaterally symmetric; zygomorphic
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Radial symmetry
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Actinomorphic; regular; with the parts in a perianth whorl all alike with 2 or more lines of symmetry.
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Regular Symmetry
- Actinomorphic; regular; with the parts in a perianth whorl all alike with 2 or more lines of symmetry.
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Zygomorphic Symmetry
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Bilaterally symmetric; irregular; divisible into equal halves along only one plane only.
- Thorn
- Woody sharp-pointed structure modified stem; may be terminal or lateral (developed from axillary buds); sometimes used loosely to mean spine or prickle.
- Unisexual
- plants possessing either male or female reproductive organs, but not both.
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Vascular Bundle
- A strand of tissue containing primary xylem and primary phloem (and procambium if present) and frequently enclosed by a bundle sheath of parenchyma or fibres.
- Monocot
- A plant with one cotyledon or seed leaf, parallel leaf venation, and fibrous roots. Floral parts occur in groups of 3.
- Dicot
- The larger of the two classes of angiosperms characterized by having two cotyledons, floral parts that occur in multiples of four or five, and net-veined leaves.