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Olson, Mark E.; Lomelí S., José A.; Cacho, N. Ivalú (2005). „Extinction threat in the Pedilanthus clade (Euphorbia, Euphorbiaceae), with special reference to the recently rediscovered E. conzattii (P. pulchellus)”. American Journal of Botany. 92 (4): 634—641. ISSN0002-9122. PMID21652441. doi:10.3732/ajb.92.4.634.
Olson, Mark E.; Lomelí S., José A.; Cacho, N. Ivalú (2005). „Extinction threat in the Pedilanthus clade (Euphorbia, Euphorbiaceae), with special reference to the recently rediscovered E. conzattii (P. pulchellus)”. American Journal of Botany. 92 (4): 634—641. ISSN0002-9122. PMID21652441. doi:10.3732/ajb.92.4.634.
Olson, Mark E.; Lomelí S., José A.; Cacho, N. Ivalú (2005). „Extinction threat in the Pedilanthus clade (Euphorbia, Euphorbiaceae), with special reference to the recently rediscovered E. conzattii (P. pulchellus)”. American Journal of Botany. 92 (4): 634—641. ISSN0002-9122. PMID21652441. doi:10.3732/ajb.92.4.634.