Polystemma canisferum (Apocynaceae, Asclepiadoideae): a distinctive new gonoloboid milkweed vine from Sonora, Mexico
. Phytotaxa [Internet]. 2016 Feb. 5 [cited 2025 Apr. 7];246(1):78–84. Available from: https://phytotaxa.mapress.com/pt/article/view/phytotaxa.246.1.6