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gymnosperm
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Scottish botanist Robert Brown first distinguished gymnosperms from angiosperms in 1825. While older classifications considered all seed plants to be assignable to a single division, Spermatophyta, more-recent classifications recognize that the characteristic of naked seeds is not important enough to be used to tie all plants with that feature into one group. Classification of gymnosperms now recognizes four extant divisions. Known as conifers, members of the division Pinophyta are among the most diverse of the gymnosperms, with some 630 living species across six families. Some of the oldest living things on Earth are conifers, including several bristlecone pines (Pinus longaeva) ...(100 of 3601 words)

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