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Fig. 5 | BMC Evolutionary Biology

Fig. 5

From: A new macrofossil ephedroid plant with unusual bract morphology from the Lower Cretaceous Jiufotang Formation of northeastern China

Fig. 5

Illustrations of representative types of ovulate cones of ephedroid plants. A, Siphonospermum, reproductive shoot with pedicelled chlamydosperms; B, Prognetella, reproductive shoot with axillary and sessile chlamydosperms subtended by elongate leaf-like bracts; C, loosely arranged ovulate spike of Chengia and Liaoningia with shortened internodes and modified bracts; D, ovulate cone of Ephedra with a few pairs of proximal modified sterile bracts and a distal pair of modified fertile bracts, each modified fertile bract subtending an axillary and sessile chlamydosperm; E, ovulate cone of Gurvanella and Beipiaoa with one apical pair of modified fertile bracts, each subtending an axillary and sessile chlamydosperm; F, Jiangchangia, ovulate cone with two whorls of leaf-like bracts enclosing two sessile chlamydosperms

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