Bárcenas, Rolando T. (2016). "A molecular phylogenetic approach to the systematics of Cylindropuntieae (Opuntioideae, Cactaceae)". Cladistics. 32 (4): 351–359. doi:10.1111/cla.12135. PMID34740297. S2CID86139803.
ipni.org
IPNI Plant Name Query Results for Grusonia, The International Plant Names Index, retrieved 2012-04-17. The IPNI entry notes that Britton & Rose incorrectly gave the authority as "F. Reichenbach", an error repeated by Anderson (2001, p. 342).
kew.org
powo.science.kew.org
"Grusonia K.Schum". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2021-06-19.
Bárcenas, Rolando T. (2016). "A molecular phylogenetic approach to the systematics of Cylindropuntieae (Opuntioideae, Cactaceae)". Cladistics. 32 (4): 351–359. doi:10.1111/cla.12135. PMID34740297. S2CID86139803.
semanticscholar.org
api.semanticscholar.org
Bárcenas, Rolando T. (2016). "A molecular phylogenetic approach to the systematics of Cylindropuntieae (Opuntioideae, Cactaceae)". Cladistics. 32 (4): 351–359. doi:10.1111/cla.12135. PMID34740297. S2CID86139803.