Adenium arabicum Our plants grown from seed produce the most amazing shapes of caudex. Adenium arabicums have many characteristics. Adenium arabicum's growth form is always squat and fat with a definite caudex without much differentiation between trunk and branches. The leaves are shiny on the upper and lower surface, unlike Adenium obesum. The skin on the plant is also somewhat more colored in purple to dark brown. The flowers are pink to deep red.