Guatemala - 1977→; Ruben Mayorga, Miguel Torres; Martin Prechtel, Jorge L., Villacorta C.,; Victor Salvador de Leon Toledo, Hoffman's 1977 Colloquium, Rilaj Maam, April 1977 – June 1990, https://huntbot.org/hibdarc/collections/296/296_Lowy_Bx5FF7_r.pdf. Hunt Institute for Botanical Documentation Archives. https://as.huntbot.org/repositories/2/digital_objects/4021 Accessed June 19, 2026.