Tithymalus heldreichii Tithymalus heldreichii subsp. semiverticillatus Euphorbia heldreichii var. roeseri Euphorbia roeseri Euphorbia amygdaloides subsp. heldreichii Euphorbia semiverticillata Euphorbia roeseri
Taxonomic data from World Flora Online, accessed June 20, 2024