Gymnosperm means “naked seed” and comes from the same Greek root as gymnastics, which means to exercise naked. This group of plants is so named because the seeds are not enclosed inside an ovary, ...
The morphology of gymnosperms the structure and evolution of primitive seed-plants [by] K. R. Sporne
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!15385~!0#focus ...
Reprint of the 1935 ed. published by The University of Chicago Press, Chicago. https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri ...
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