Holm, Theo. (1925) Hibernation and Rejuvenation, Exemplified by North American Herbs. American Midland Naturalist, Vol. 9 (9): 439-476. and Vol. 9 (10): 477-512.. The title probably alludes to the title of the first work on plant life-form, Om Skudbygning, Overvintring og Foryngelse [translated title: On shoot architecture, hibernation and rejuvenation] (1884) by Holm's former mentor in Copenhagen, Eugen Warming, who died the year before. At the end of the second part, Holm gives a list of all his papers on life-form-related morphology and anatomy of American plants, ordered by genus.