summer-stem

Updated: May 29, 2025

But sometimes these dimorphic species are seen to revert to the primary condition, developing a fertile cone at the summit of the green summer-stem. I have had the opportunity of collecting an instance of this anomaly on the tall Equisetum telmateja in Switzerland, and other cases are on record in teratological literature.

Hugo de Vries - Species and Varieties, Their Origin by Mutation