Subspecies, varieties, forms and cultivars of plants belonging to the Adenium obesum group

• Adenium arabicum Balf.f.: is similar in appearance to Adenium obesum, but creates a massive, more squat and fat caudex and has larger thick fleshy leaves. Distribution: Yemen and Saudi Arabia.
• Adenium dhofarense Rzepecky: Has large, leathery and glossy leaves and very small flowers. Distribution: Dhofar coast (Oman) and adjacent mountains of Yemen.
• Adenium obesum Roem. & Schult.: The trunk will get up to one meter in diameter, and the plant will grow op to five meters.
• Adenium obesum f. albiflorum Lodé
• Adenium obesum subs. boehmianum (Schinz) G.D.Rowley: The flowers are similar to those of A. swazicum but the leaves are broader pale grayish-green.
• Adenium obesum subs. oleifolium (Stapf) G.D.Rowley: succulent shrublet 12-40 cm high from a subterranean rootstock. It has long, narrow leaves frequently folded along the midrib. Distribution: Botswana, Namibia and S. Africa.
• Adenium obesum subs. socotranum (Vierh.) Lavranos: It is the giant of the genus, forming a massive conical trunk/caudex several metres tall and up to 2.4 m in diameter. It resembles a miniature baobab.
• Adenium obesum subs. socotranum f. cristata hort.: crested form.
• Adenium obesum subs. somalense (Balf.f.) G.D.Rowley
• Adenium obesum subs. swazicum (Stapf) G.D.Rowley: It is a dwarf shrub, up to 30 cm high, with an enlarged succulent stem with few branches. The caudex is evident only in young specimens.
• Adenium somalense var. crispum Chiov.: is a dwarf form of A. somalense (less than 30 cm tall) with white flowers heavily striped with red or completely red and a large underground napiform caudex. Distribution: Coast of southern Somalia.