Subspecies, varieties, forms and cultivars of plants belonging to the Euphorbia horrida group

• Euphorbia horrida Boiss.: Spiny succulent shrub with irregular basally clumping stems.The formidable rows of spines up to 40 mm long are actually the dried remnants of its flower stalks and are very rigid.
• Euphorbia horrida f. cristata hort.
• Euphorbia horrida var. gigas hort., Lavranos
• Euphorbia horrida hybrid hort.: The hybrids of Euphorbia horrida are very common in the trade and in the collections. This hybrids involves several different species (often resulted from accidental crosses) and are extremely variable due to their hybrid origin and have many varieties and forms.
• Euphorbia horrida var. major A.C.White et al.
• Euphorbia horrida f. monstruosa cristata hort.
• Euphorbia horrida f. monstruosa hort.
• Euphorbia horrida var. noorsveldensis A.C.White et al.
• Euphorbia horrida var. striata A.C.White et al.