Reichenbach, Heinrich Gustav (1823–1889) letter to unknown correspondent, 22 [August] 1872, https://huntbot.org/hibdarc/collections/370/Reichenbach-HeinrichGustav-1_r.pdf. Hunt Institute for Botanical Documentation Archives. https://as.huntbot.org/repositories/2/digital_objects/3203 Accessed March 20, 2026.