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actual flowering Age of Cycads ancestral type ancient flowers appearance Arber and Parkin armour attracted attention Black Hills bore botanical botanists bracts buds cone corolla Courtesy of Professor Cycad National Monument cycadeoid flowers Cycadeoidea ingens DEPARTMENT OF BOTANY discovered disk earliest enclosed Etruscan evolutionary history Field Museum floral structure foliage forest FOSSIL CYCAD FLOWER FOSSIL CYCAD TRUNK fossil flowers fossil trunks geologist Geology hall Hall Hills of Dakota hypothetical later leaf-bases living cycads living plants Macbride magnolia Mesozoic modern flower morning-glory Museum of Natural Natural History nection numerous origin outer layer petrified Photograph Portland present preserved primitive flowers Professor G. R. Wieland Professor Wieland Professor Wieland's investigations remains Reptilian second floor seen sepals simpler so-called Sago Palms specimens spirally stage stamens stem striking feature strobilus surprising discoveries thick-stemmed tinct tract tropical true flowering plants trunks were described tubular tulip tree unbranched vegetation well-known wilted