adventitious roots -- A root that grows from somewhere other than the primary root, for example, roots that ari from stems or leaves.
alternation of generations -- Life cycle in which haploid and diploid generations alternate with each other.
anemophily -- Seed plants which are pollinated by wind are said to be anemophilous.
angiosperm -- n. A group of plants that produce eds enclod within an ovary, which may mature into a fruit; flowering plants. anther -- The pollen producing tip of a stamen; part of a flower. More info?
antheridium -- The organ on a gametophyte plant which produces the sperm cells.
anthophyte -- A flowering plant, or any of its clost relatives, such as the Bennettitales, Gnetales, or Pentoxylales.
apical meristem -- Group of cells at the growing tip of a branch or root. It divides cells to create new tissues.
archegonium -- The organ on a gametophyte plant which produces the egg cell, and nurtures the young sporophyte.
axil -- The angle formed between a leaf stalk and the stem to which it is attached. In flowering plants, buds develop in the axils of leaves. bipinnate -- Describing a pinnate leaf in which the leaflets themlves are further subdivided in a pinnate fashion.
bisporangiate -- When a flower or cone produces both megaspores and microspores, it is said to be bisporangiate. Most flowers are bisporangiate.
颈椎病用药blade -- Any broad and flattened region of a plant or alga, which allows for incread photosynthetic surface area.
bract -- Any reduced leaf-like structure associated with a cone or flower.
bryophyte -- Plants in which the gametophyte generation is the larger, persistent pha; they generally lack conducting tissues. Bryophytes include the Hepaticophyta (liverworts), Anthocerotophyta (hornworts), and Bryophyta (moss).
carpel -- A unit of the pistil; it is evolutionarily a modified leaf.
cataphyll -- In cycads, a scale-like modified leaf which protects the developing true leaves.
很火的歌曲columella -- A small column of tissue which runs up through the center of a spore capsule. It is prent in hornworts, moss, and some rhyniophytes.
compound leaves -- n. Leaves with two or more leaflets attached to a single leaf stem.
cotyledon -- n. The "ed leaves" produced by the embryo of a ed plant that rve to absorb nutrients packaged in the ed, until the edling is able to produce its first true leaves and begin photosynthesis; the number of cotyledons is a key feature for the identification of the two major groups of flowering plants.
elater -- A cell or part of a cell which assists in dispersing spores. The elaters change shape as they lo or acquire water, and they will then push against surrounding spores.
embryophyte -- Synonym for the Plantae, as here defined. It includes all green photosynthetic organisms which begin the development of the sporophyte generation within the archegonium.
enations -- Flaps of tissue such as tho found on psilophytes.
endodermis -- Literally "inner skin", this is a layer of cells which surrounds the central core of vascular tissue, and which helps to regulate the flow of water and dissolved substances.
entomophily -- Seed plants which are pollinated by incts are said to be entomophilous.
epiphyte -- A plant which grows upon another plant. The epiphyte does not "eat" the plant on which it grows, but merely us the plant for structural support, or as a way to get off the ground and into the
canopy environment.
eustele -- When a plant's vascular tissue develops in discrete bundles, it is said to have a eustele. See also protostele and siphonostele.
fiber -- Elongated and thickened cell found in xylem tissue. It strengthens and supports the surrounding cells.
flower -- Collection of reproductive structures found in flowering plants. More info?
fruit -- In flowering plants, the structure which enclos the eds. True fruits develop from the ovary wall, such as bananas and tomatoes, though not all fruits are edible, such as the dry pods of milkweed or the winged fruits of the maple.
grain -- (1) The texture of wood, produced by the kinds of xylem cells prent. (2) The fruit of a member of the grass.
guard cells -- Pair of cells which surround a stomate and regulate its size by altering their shape.
四字签名gymnosperm -- n. A plant that produces eds, which are not enclod; includes any ed plant that does not produce flowers.
gynostemium -- The central reproductive stalk of an orchid, which consists of a stamen and pistil fud together.
habit -- The general growth pattern of a plant. A plant's habit may be described as creeping, trees, shrubs, vines, etc.
herb -- Generally any plant which does not produce wood, and is therefore not as large as a tree or shrub, is considered to be an herb. heterosporangiate -- Producing two different kinds of sporangia, specifically microsporangia and megasporangia. Compare with heterosporous.
heterosporous -- Producing two different sizes or kinds of spores. The may come from the same or different sporangia, and may produce similar or different gametophytes. Contrast with homosporous, and compare with heterosporangiate.忧愁的意思
holdfast -- Anchoring ba of an alga.
homosporous -- Producing only one size or kind of spore. Contrast with heterosporous.
hypha -- n.Threadlike filaments that form the mycelium (body) of a fungus; hyphae- pl.
inflorescence -- A cluster of flowers.
internode -- The region of a stem between two nodes, when there is no branching of the vascular tissue.
lamina -- Any broad and flattened region of a plant or alga, which allows for incread photosynthetic surface area.
leaf -- An organ found in most vascular plants; it consists of a flat lamina (blade) and a petiole (stalk). Many flowering plants have additionally a pair of small stipules near the ba of the petiole.
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leaf trace -- The strand of vascular tissue which connects the leaf veins to the central vascular system of the stem.
常见消炎药leaflet -- In a compound leaf, the individual blades are called leaflets.
magnoliid -- Any member of the basal asmblage of flowering plants.
mannoxylic -- Wood in which there is a great deal of parenchyma tissue among the xylem is called mannoxylic. Cycads and pteridosperms have mannoxylic wood. Contrast with pycnoxylic.
megaspore -- In plants which are heterosporous, the larger kind of spore is called a megaspore; it usually germinates into a female (egg-producing) gametophyte. Contrast with microspore.
meristem -- Group of undifferentiated cells from which new tissues are produced. Most plants have apical meristems which give ri to the primary tissues of plants, and some have condary meristems which add wood or bark.
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merophytes -- Group of cells which have all been produced from the same initial cell. Leaves and stems in particular are often built from
气得什么填空词语specific patterns of merophytes.
microphyll -- A kind of leaf, specifically one which has a single, unbranched vein in it. Microphylls are only found in the lycophytes.
microspore -- In plants which are heterosporous, the smaller kind of spore is called a microspore; it usually germinates into a male (sperm-producing) gametophyte. Contrast with megaspore.
mycorrhizae -- Symbiotic association between a fungus and the roots or rhizoids of a plant. More info?
node -- The region of a stem between two internodes, where there is branching of the vascular tissue into leaves or other appendages. ovary -- In flowering plants, the part of the flower which enclos the ovules. When the ovary matures, it becomes the fruit.
ovule -- In ed plants, the structure which gives ri to the ed.
paleoherb -- Any member of a group of basal flowering herbs which may be the clost relatives of the monocots. They include the water lilies, Piperales, and Aristolochiales.
parenchyma -- A generalized cell or tissue in a plant. The cells may manufacture or store food, and can often divide or differentiate into other kinds of cells.
perennial -- A plant which continues to grow after it has reproduced, usually meaning that it lives for veral years.
perianth -- The pals and petals of a flower are together called the perianth; literally "around the anthers". More info?
peristome -- A t of cells or cell parts which surround the opening of a moss sporangium. In many moss, they are nsitive to humidity, and will alter their shape to aid in spore dispersal.
petal -- One of the outer appendages of a flower, located between the outer pals and the stamens. Petals often display bright colors that rve to attract pollinators. More info?
phloem -- Nutrient-conducting tissue of vascular plants.
