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photoperiodism
the initiation of flowering in response to relative lengths of day and night
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senescence
natural death; a breakdown of cellular structures leading to death
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mutation
an induced, inheritable change in the structure of a gene
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ephemerals
short-lived plants
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spine
a modified leaf part that is hard and sharply pointed
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thorn
a modified short branch, or stem, that is hard and sharply pointed
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stipule
an outgrowth from the base of a leaf stalk, sometimes functioning as a protective structure
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pilose
having long soft hairs
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cryptic coloration
camouflage
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recurved
prickles or thorns having tips pointed downward
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symbiosis
the living together for mutual benefit of two or more organisms of different species
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tannin
natural fungicide; astringent; a substance occurring in the bark or leaves of some species, functioning to protect against predators
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callus
a corky tissue developed by woody species to cover wounds; parenchyma tissue
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prickle
a hard, pointed epidermal outgrowth on some species' stems and leaves
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callose
a plant substance (protein) created and deposited in the pores of phloem sieve plates, especially in response to injury
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resin
a viscous, protective secretion of many conifers that is insoluble in water and hardens on contact with air
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gum
a sticky, water-soluble plant secretion that hardens on exposure to air
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latex
a thick, white, fluid secretion of many plant species that seals small scars
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enzymes
a protein molecule functioning as a chemical catalyst in a biochemical reaction
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alkaloids
bitter taste; a nitrogen-containing compound, frequently used as a chemical defense by plants
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phototoxin
a plant product having toxic effects on herbivores and other invasive organisms
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phytoalexin
a chemical produced by a plant to inhibit the growth of pathogens
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raphide
a needle-shaped crystal of calcium oxalate in cetain species' cells that deter herbivores
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heterosis
hybrid vigor; mixing gene pools
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biennial
a plant completing its life cycle within two growing periods
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annual
a plant completing its life cycle within a single growing season
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perennial
a plant living through several growing seasons
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